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http://www.instructables.com/id/DIY-Bike-Generator/
technology workshop living food play outside
DIY Bike Generatorby SKSW47 on May 9, 2014
Table of Contents
DIY Bike Generator . . . . . . . . . . . . . . . . . . . . . . .
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Intro: DIY Bike Generator . . . . . . . . . . . . . . . . . . .
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Step 1: Assembling the Bike . . . . . . . . . . . . . . . . . .
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Step 2: Adding the Fan Belt to the Motor . . . . . . . . . . . .
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Step 3: About the Fan Belt Choice . . . . . . . . . . . . . . .
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Step 4: Step 4: Motor to Charger . . . . . . . . . . . . . . . .
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Step 5: Step 5: Charger to Battery . . . . . . . . . . . . . . .
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Step 6: Step 6: Battery to Inverter . . . . . . . . . . . . . .
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Step 7: Making the Bike User Friendly . . . . . . . . . . . . .
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Step 8: Hacking the Charge Controller . . . . . . . . . . . . .
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Step 9: Battery Voltage . . . . . . . . . . . . . . . . . . . .
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Step 10: Preserving the Battery . . . . . . . . . . . . . . . .
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Step 11: Board Layout . . . . . . . . . . . . . . . . . . . . .
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File Downloads . . . . . . . . . . . . . . . . . . . . . . . . .
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Step 12: Current Progress . . . . . . . . . . . . . . . . . . .
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Step 13: Future Ideas . . . . . . . . . . . . . . . . . . . . .
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Related Instructables . . . . . . . . . . . . . . . . . . . . .
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Advertisements . . . . . . . . . . . . . . . . . . . . . . . . .
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Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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http://www.instructables.com/tag/type-id/category-technology/http://www.instructables.com/tag/type-id/category-workshop/http://www.instructables.com/tag/type-id/category-living/http://www.instructables.com/tag/type-id/category-food/http://www.instructables.com/tag/type-id/category-play/http://www.instructables.com/tag/type-id/category-outside/http://www.instructables.com/member/SKSW47/?utm_source=pdf&utm_campaign=title
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Intro: DIY Bike GeneratorUsing easily accessible parts, it is
possible to build your own bicycle generator that will charge your
cell phone! This instructable is an extension of this instructable
madeby our friends. Eventually, this bike will stand on its own in
our student union, so our classmates can sustainably charge their
phones off the grid!
The basic setup of the bike is as follows: the back wheel of the
bike spins a DC motor via fan belt, the motor is connected to a
charge controller, the charge controllercharges a lead-acid
battery, and the battery is then connected to an inverter. You can
then plug your phone into the outlets of the inverter!
Basic Materials needed:
Bicycle Stand
Bicycle Frame with Back Wheel
12V Lead Acid Battery
DC-AC Inverter
DC-DC Battery Charger
24V DC Scooter Motor
Fan Belt
Fan Belt Pulley
Wires, Screws, Wood, and a Metal Rod
NOTE: We added more to our bike to make it run better, but these
are the bare minimum materials to get it up and running.
Step 1: Assembling the BikeWe attached our bike system to a 2'
by 6' piece of plywood. We used a bike stand to suspend and
stabilize the back wheel. You can bolt the back wheel stand to
theboard, but we thought it was unnecessary since other portions of
the bike were attached to the board. Our bike was donated with the
front wheel off, so we built a frontwheel stand. Make sure you have
enough room on the board to attach the motor behind the back
wheel!
Building the front wheel stand: The forks had a 1 cm diameter
hole, so we found a one inch dowel for it to rest on. In addition,
we took a 1.5" x 3" wooden beam andcut it into two 9.5" and two
4.5" blocks. We drilled a 1cm hole 1/2" down from the top of each
of the 9" blocks. We then put the metal rod through the blocks
andassembled the stand (see photo above). We added some washers and
nuts to make the connections more secure. The two 4.5" blocks
should be cut to fit tightlybetween the 9" blocks, as shown above.
After building the bike stand, the front wheel should sit snugly on
the blocks. Next, we screwed the lower 4.5" block down to
theplywood. Finally, we attached the upper 4.5" block for
stability. Now the bike stand for the front wheel is complete and
should sit snugly on the rod between the blocks.
http://www.instructables.com/id/How-to-Build-a-Bicycle-Generator-1/?ALLSTEPShttp://www.mcmaster.com/#large-cell-batteries/=rw4943http://www.mcmaster.com/#dc-inverters/=rw49enhttp://www.hobbypartz.com/75p-0620-charger.html?gclid=CMDXkuXS17YCFUeCQgodiWQAQghttp://www.monsterscooterparts.com/24v30mowisp.htmlhttp://www.amazon.com/Browning-Super-Gripbelt-Section-Length/dp/B003U1W6P8/ref=sr_1_11?s=industrial&ie=UTF8&qid=1397512047&sr=1-11&keywords=1%2F2+in+vbelt+96http://www.amazon.com/CHICAGO-CASTING-Diameter-V-Groove-Die/dp/B00004RAO8
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http://www.instructables.com/id/DIY-Bike-Generator/
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http://www.instructables.com/id/DIY-Bike-Generator/
Step 2: Adding the Fan Belt to the MotorWe removed the tire from
the back wheel using this video (make sure all the air is out of
your tire). Next, we attached the pulley to our motor by adding a
collar to thepulley and making it D-shaped. The pin running out
side of the motor is in a D-shape so this allows the pulley to
fixate to the motor and rotate the internal portion of
motorsmoothly. The screw holding it on is a left handed screw that
goes on in the opposite direction of a normal screw allowing the
motor to turn without having the screw comeout. We then attached
the belt to the wheel and to the pulley. Make sure that the motor
is directly aligned with the back wheel. We screwed down the motor
to theplywood base by having one person hold the motor unit as far
back as possible while the other screwed it down, this insured
maximum tension in the fan belt. The moretension we can get on the
belt, the better it will work.
Note: Be aware of the direction that your motor is spinning in
order to a positive and not negative voltage output. If it's
negative, just switch the leads at your chargecontroller.
https://www.youtube.com/watch?v=1zxHYJ0AtAo
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http://www.instructables.com/id/DIY-Bike-Generator/
Step 3: About the Fan Belt ChoiceThe motor is rated at 2800 rpm,
but riding at 20 mph is only 250 rpm at the back wheel. Thus, we
chose a pulley with diameter about ten times smaller than the
wheel, soriding leisurely could give us higher rpm (about 10x
increase). For practicality purposes we chose the thickest belt
that could fit in the rim of our wheel. Our belt was ratherlong
because it needed to be able to fit around the entire wheel and
still have extra length to attach the pulley at the motor.
Depending on what belt you are using, themotor could be mounted at
various distances from the back wheel.
Function of Motor: This component is what is converting the
movement of your legs on the bike into a DC voltage.
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http://www.instructables.com/id/DIY-Bike-Generator/
Step 4: Step 4: Motor to ChargerPurpose of Charger
The charge controller regulates the rate at which current
travels into the battery. Ultimately, the charge controller
prevents overcharging and draining of the battery, whichwill ruin
the health of the battery. If the battery is overcharged then water
electrolysis will occur, converting the water molecules into
hydrogen and oxygen gas inside thebattery. This will increase the
sulfuric acid concentration in the battery and expose the internal
plates to oxygen, quickly degrading the internal materials.
Draining thebattery will lead to sulfation, the crystallization of
sulfur on the plates inside the battery. This will diminish the
concentration of sulfuric acid in the battery and it will nolonger
be able to charge to its original potential.
Charger Properties
This charger can regulate the amount of current going to the
battery, read the voltage that you are producing when biking, and
the total amount of energy you havegenerated in one bike session.
It will not give you the percentage of the battery charged,
therefore (this is in the additional section) we have required that
the user ride onthe bike a set amount of time before the inverter
will allow them to charge their device and that the user cannot
charge the device if they are not biking.
The battery that we are using is a 12 V battery therefore the
charge controller we chose can take us from 12V to 24V. The battery
has a maximum charging current of 5.4A, therefore the charge
controller should be put on a current output setting less than the
max. Increasing the current that the charge controller is requiring
will makepedaling harder. Thats a good reason why its good to keep
the gear system on your bike, and not make it a one-speed!
Adding a Capacitor or Zener Diode
Also, it is important to not overcharge the power controller by
biking over its limit of 24V. You can add a zener diode with a
breakdown voltage of 24V, so that if voltage isabove 24V the zener
diode will allow excess voltage to flow away from the charger.
In this setup we added a capacitor in parallel with the charge
controller to assist in regulating the voltage generated by the
motor. If we were to suddenly have LanceArmstrong hop on the bike
and generate a voltage more than 24V temporarily, we can avoid a
sudden overload to the charge controller by forcing a regular
dischargefrom the capacitor.
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http://www.instructables.com/id/DIY-Bike-Generator/
Step 5: Step 5: Charger to BatteryChoosing your Battery
As we said before, you want to make sure that your battery is
being charged at an appropriate current and voltage, well within
the limits listed on your battery. Be sure tofind a battery that
your charge controller can charge or vice versa. The reason that
you want to have a battery is so that you can store the energy that
you are creatingsothat you dont have to bike constantly to charge
your device and that you can bike without charging a device and
store your energy for later.
Taking Care of your Battery
Make sure your battery is not moving when you are bikingsloshing
around the liquids in the battery will add a kinetic energy
variable into storage of your energy. Its nota good variable. Your
battery will output different voltages at different levels of
charge. The voltage across your battery will be different when it
is charging, sitting, anddischarging; they will be about 14V,
12.5V, and 11 V respectively. Remember that these values will
change over time (most likely decrease) as your battery ages and
isbeing used. Degradation will occur. Be sure that if the output of
the battery is 14V then you drain the battery so that it doesnt
overcharge.
http://www.power-sonic.com/images/powersonic/sla_batteries/ps_psg_series/12volt/PS-12180_12_Sept_10.pdf
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Step 6: Step 6: Battery to InverterPurpose of AC Inverter
The current that comes out of your wall socket is alternating
current (AC) rather than direct current (DC). The inverter converts
the DC output of the batter to AC so thatyou can appropriately
charge your devices. Also it provides the infrastructure to charge
your devices, as in a plug and USB ports.
Choosing the Right Inverter
When choosing your inverter you want to be sure to make sure it
give an output current and voltage similar to that of your typical
wall socket, accepts a range of voltagessimilar to your battery,
and the wattage that it can output.
Depending on the devices that you decide to charge (here we were
interested in charging laptops, cell phones, and other small
student devices) you need to make sureyour inverter can output the
right amount of watts. As a reminder, watts are a measure of energy
required over a unit of time, joules per second. Appliances
typically listthe wattage that they require but to give you an idea
a cell typically requires 5 watts and a laptop computer requires
about 45-60 watts. The inverter featured in thisinstructable has a
capacity of 400 watts.
Step 7: Making the Bike User FriendlyOur aim is to put this bike
in our student union. Therefore we wanted to make this bike as user
friendly as possible. A big obstacle we found was that the charge
controllerrequired you to press a button for 3 seconds in order for
it to start charging. Although this is relatively simple for us to
do, we felt like other users might not read thedirections and think
that they were charging even though they hadn't pressed start. The
screen lights up which is misleading because it is technically
"on", but is notcharging. Therefore, we hacked our charger and will
control it with an arduino instead to make the energy generation
process user-friendly.
Step 8: Hacking the Charge ControllerHacking the Charger: We
took apart the charger by unscrewing the sides and popping off the
top lid. We found that there was a ribbon wire connecting the 4
buttons tothe circuit board. There were 5 wires on the ribbon wire,
thus we thought that there might be one "reference" wire and the
other four wires went to the buttons. Connectingthe "reference"
wire to any of the other four button wires was equivalent to
pushing a button. We took a multimeter and tested our theory, and
it was valid. To press abutton, we should connect one of the wires
with the "reference" wire. Next, we added wires to each of the five
terminals where the ribbon wire used to connect to. Thewires were
led outside of the charge controller by drilling a hole through the
side panel and pulling them through. These wires lead to our
arduino shield, which will allowus to press the buttons and control
the start button autonomously using a relay.
External Buttons: We used 4 buttons on our shield to recreate
the buttons on the controller for testing purposes and in case we
wanted to change settings on the chargecontroller.
Use of a Relay: We used a OMROM G5V-1 Relay to "press" the start
button using our arduino. The image above shows how we connected
each of the relay pins. Thedigital output pin from the arduino that
is wired to the relay will signal the pressing of the button when
it is set to HIGH. Two other pins on the relay connect to the
startbutton wire and the "reference" wire, completing the
connection. We had to connect one other relay pin to ground. For
precaution, we put a diode across signal andground of our relay
because we don't want current flowing into our arduino when the
digital output pin is switched to LOW (start button is off) . Now
the arduino has thecapability of pressing the start button
autonomously.
Programming the Start: Although we know how to get the arduino
to press start, we don't know when to tell it to do so yet. We
would like it to press start for a fewseconds after the user has
been pedaling for about 10 seconds. How will we know a user is
pedaling? We would like our arduino to read the DC voltage of our
motorwhich will be present when a person is biking. However, our
voltage is more than 5V, so our arduino cannot read it directly as
it has a limit of 5V. We used this article tocreate an appropriate
voltage divider to have the arduino read motor voltage.
A simple sketch of this voltage divider is in the picture above.
I will include all the arduino code in another step. We used a 3.9K
and 1K resister to scale down the voltagegoing into the arduino by
a factor of 5. We've yet to pedal hard enough to get the motor to
go above 17V, so we should be safe. Usually, we are outputting less
than 15Vfrom our motor. The voltage divider will go into an analog
input in the arduino which will let the arduino calculate the motor
voltage.
Psudo Code:
void loop(){while(!started){
startCharger();
}
void startCharger(){
http://www.omron.com/ecb/products/pdf/en-g5v_1.pdfhttps://www.inkling.com/read/arduino-cookbook-michael-margolis-2nd/chapter-5/recipe-5-11
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if (motorVoltage>12 && hasBeenOnForLong){
digitalWrite(relayOut, HIGH); //which really is equivalent to
pressing Startstarted=true;
}
else if (motorVoltage>12){
//say it has been on for longer
}
else{
//reset hasBeenOnForLong to the beginning
}
}
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http://www.instructables.com/id/DIY-Bike-Generator/
Step 9: Battery VoltageWe soldered an additional voltage divider
to the shield in order to measure the voltage of our battery. We
found that this was the best way to calculate how much ourbattery
was actually charged. The output voltage of the battery is between
14-11V; decreasing as it becomes discharged. We found these tables
which relate the outputvoltage of the battery to the battery state
of charge in percent values for a 12V Lead Acid battery. We can
make estimates from this graph, but we will further calibrate
itlater. Eventually we could add an LCD screen to readout the
percent battery charge on our arduino. This readout can be coded by
a lot of "if" statements simplystructured as follows:
if(batteryVoltage
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http://www.instructables.com/id/DIY-Bike-Generator/
Step 10: Preserving the BatteryLead Acid Batteries last a lot
longer if they are not completely drained. Furthermore, we want to
make sure users are generating electricity and not just charging
devicesfrom the battery without pedaling. We decided that we wanted
users to bike for at least 2 minutes continuously before they were
allowed to charge their phone. This ideaturned out to be a little
difficult, because we need something that can control a lot of
current. We ended up employing a HUF7345 MOSFET, which we be
between ourinverter and battery. When we signal the MOSFET with our
digital output pin on the arduino, it will allow current to flow
from the inverter to the negative terminal of thebattery, thus
completing the inverter/battery portion of the circuit. When it is
signaled on, the MOSFET will act as though it is not there at all
and the cell phones cancharge normally. This is possible because
the MOSFET we used allows a high current. However, we decided not
to allow computer charging on our bike because thatwould draw more
current than the MOSFET could handle. Furthermore, we were afraid
the computer would deplete our battery. We are relying on some
users biking justfor fun without charging.
We will keep track of time since the charger pressed start and
once two minutes have elapsed, we turn the MOSFET "on" by setting
the digital out to HIGH. Here is partof the code:
String
allowBatteryAccess(){if(currentMillis-startMillis>(1000*120)){
//if 2 minutes of time has elapsed
digitalWrite(allowBattery, HIGH);
return "Your device has started to charge. Keep Peddling";
}
return " "
}
https://www.fairchildsemi.com/ds/HU/HUF75345P3.pdf
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http://www.instructables.com/id/DIY-Bike-Generator/
Step 11: Board LayoutWe soldered all our components to a small
board. Here is a color coded layout of how we attached everything.
A lot of what we were attaching was to components off theboard, so
the names of these components are written instead. Attached is the
untested Arduino Code for our board.
File Downloads
Sasha_and_Sallie.ino (3 KB)[NOTE: When saving, if you see .tmp
as the file ext, rename it to 'Sasha_and_Sallie.ino']
Step 12: Current ProgressOur board currently has the same
functions as the charge controller before it was hacked with the
arduino. We have the board wired up for the most part, but we need
stillneed to attach a couple more components:
attach the battery and motor positive leads to the voltage
dividerground the other end of the voltage dividerattach the
inverter negative lead to the drain of the MOSFETattach the ground
lead of the battery to the source of the MOSFETattach battery
ground to the arduino groundground the relay
These connections may be more difficult to create because the
wires on the external components of the mortor and charge
controller are much larger than the wires onour arduino shield.
Once we get everything added we can test our code. We may need to
fiddle with the timing of the start button and how long we it will
be "on". Thecharger performs battery checks when it turns on so we
might need to hold it down for as many as 8 seconds. We will check
this once we get our board finished.
Step 13: Future IdeasThough our system works, there is a lot
more to be done with user interfacing before it can be introduced
unsupervised in the student union. We definitely should encaseour
electronics so that no one can touch them. We also would like to
have a LCD display the can interact with the user showing how much
they have charged the batteryand their real time motor output
voltage. We already have a clear plexiglass stand where people can
put their homework reading. We plan to have instructions pasted
tothe back of this stand and mount the charge controller and
arduino to the bottom of the stand.
http://www.instructables.com/files/orig/F58/FEBY/HUZKEH19/F58FEBYHUZKEH19.ino?utm_source=pdf&utm_campaign=fileshttp://www.instructables.com/files/orig/F58/FEBY/HUZKEH19/F58FEBYHUZKEH19.ino?utm_source=pdf&utm_campaign=fileshttp://www.instructables.com/files/orig/F58/FEBY/HUZKEH19/F58FEBYHUZKEH19.ino?utm_source=pdf&utm_campaign=fileshttp://www.instructables.com/files/orig/F58/FEBY/HUZKEH19/F58FEBYHUZKEH19.ino?utm_source=pdf&utm_campaign=files
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Comments
50 comments Add Comment view all 69 comments
Fission Chips says: Feb 13, 2015. 8:08 AM REPLYHey, nice job.
But just a question - did you copy this from Chris Hackett's and
Popular Science's book Big Book of Maker Skills? They seem pretty
similar.
McgyverD says: Feb 10, 2015. 1:08 AM REPLYI built one out of a
exercise bike and used a chain and a treadmill motor that is giving
me 12 volts at 50amps, I'm able to charge the battery and watch tv
atthe same time. And just going at the rate of 2 miles per hour
riding it. I invented it my self the design.
SKSW47 says: Feb 10, 2015. 12:33 PM REPLYThats awesome!
http://www.instructables.com/id/How-To-Build-A-Bicycle-Generator/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/How-To-Build-A-Bicycle-Generator/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/How-To-Build-A-Bicycle-Generator/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/How-To-Build-A-Bicycle-Generator/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/member/saullopez52/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/DIY-BIKE-HACK-DC-BIKE-GENERATOR-LED-Lights-Light-E/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/DIY-BIKE-HACK-DC-BIKE-GENERATOR-LED-Lights-Light-E/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/DIY-BIKE-HACK-DC-BIKE-GENERATOR-LED-Lights-Light-E/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/DIY-BIKE-HACK-DC-BIKE-GENERATOR-LED-Lights-Light-E/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/DIY-BIKE-HACK-DC-BIKE-GENERATOR-LED-Lights-Light-E/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/DIY-BIKE-HACK-DC-BIKE-GENERATOR-LED-Lights-Light-E/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/DIY-BIKE-HACK-DC-BIKE-GENERATOR-LED-Lights-Light-E/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/DIY-BIKE-HACK-DC-BIKE-GENERATOR-LED-Lights-Light-E/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/member/GREENPOWERSCIENCE/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Paper-cup-hydro-electric-generator/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Paper-cup-hydro-electric-generator/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Paper-cup-hydro-electric-generator/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Paper-cup-hydro-electric-generator/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/member/n1cod3mus/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Cycle-Phone-Charger/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Cycle-Phone-Charger/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Cycle-Phone-Charger/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/member/Rajat
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Cool/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Mini-Ecologic-Generator-MEG/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Mini-Ecologic-Generator-MEG/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Mini-Ecologic-Generator-MEG/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Mini-Ecologic-Generator-MEG/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/member/Ger
de la
Mora/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/member/Ger
de la
Mora/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Bike-Light-2011/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/Bike-Light-2011/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/member/hydronics/?utm_source=pdf&utm_campaign=relatedhttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#commentshttp://www.instructables.com/id/DIY-Bike-Generator/http://www.instructables.com/id/DIY-Bike-Generator/http://www.instructables.com/id/DIY-Bike-Generator/http://www.instructables.com/member/Fission+Chips/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Fission+Chips/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/McgyverD/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/McgyverD/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/SKSW47/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/SKSW47/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSS
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http://www.instructables.com/id/DIY-Bike-Generator/
Kressle says: May 14, 2014. 6:53 PM REPLYDon't know if anyone
else has suggested this, but what about running neodymium magnets
along the rim of the wheel and spinning those through a coil ofwire
like a wind turbine? More expensive, but you may get more
efficiency with a better design. Thoughts?
dratman says: Jul 28, 2014. 9:32 AM REPLYMagnets-on-bike-wheel
would be great as an engineering exercise, but in this project, it
is another kind of exercise that counts.
Billster36 says: Jun 16, 2014. 7:22 AM REPLYI don't get the need
for the inverter. Why not just hook up a standard cigarette lighter
type outlet to the battery and charge the cell phone with the same
sortof plug you would use in the car?
arizzotti says: May 19, 2014. 2:08 PM REPLYYou can vote for this
Bike Generator to win a Nest here:
http://homeplanet.maker.good.is/projects/bikegenerator?position=0&sort=972
Bill WW says: May 19, 2014. 12:37 PM REPLYVery nice, love the
way you link the material list to the actual suppliers.
I always thought it would be great to connect a bike generator
such as yours to a TV (as the ONLY power source). You would have to
work out if you wanted towatch.
300w = 0.4hp, about the max a human can sustain.
Computothought says: May 17, 2014. 4:30 PM REPLYNice.
fazlehaq says: May 16, 2014. 8:45 PM REPLYexactly how long it
took to charge that battery completely ?
loachridge says: May 15, 2014. 10:57 AM REPLYOr maybe even make
some refinements to the K-TOR to fit it into a bike frame.
loachridge says: May 15, 2014. 10:56 AM REPLYLook up "12 volt dc
hand generator".This is essentially what was mounted to bikes I
mentioned earlier.Can you make this work dual purpose?Put an LED in
for lower consumption. Add a small Li battery for charge storage if
your device isnt plugged in.
omikeo says: May 13, 2014. 8:48 PM REPLYcan you give us an
indication of efficiency
like how long and fast one may have to pedal to make toast?
Squidyman says: May 14, 2014. 12:52 PM REPLYGiving an
guesstimate, a toaster draws about 700 watts. You could probably
create about 200-300 watts peddling pretty hard. It takes
approximately 100watts to toast a piece of bread so it would take
at least 30 minutes to be able to toast your bread. You would need
a shower after all that peddling, so anyenergy you saved by
peddling is lost to the water and heat bill XD
omikeo says: May 14, 2014. 8:05 PM REPLYYeah fig' it'd be a lot
of work, I don't think people realize how much work would have to
be done to create the energy they use. If they had tocontribute in
this form of muscle power to electric, conservation, I suspect
would be the norm.
Squidyman says: May 14, 2014. 12:56 PM REPLYminus my spelling
errors! :P
NovaKnightZer0 says: May 14, 2014. 6:09 PM REPLYI think i might
attempt this.
But im going to try and not take apart my bike and just make it
so that i can just easily place my bike into the contraption pedal
make electricity and when imneed to go somewhere just take my bike
off and go.
http://www.instructables.com/member/Kressle/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Kressle/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/dratman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/dratman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Billster36/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Billster36/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/arizzotti/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/arizzotti/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Bill+WW/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Bill+WW/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Computothought/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Computothought/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/fazlehaq/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/fazlehaq/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/loachridge/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/loachridge/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/loachridge/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/loachridge/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/omikeo/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/omikeo/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/omikeo/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/omikeo/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/NovaKnightZer0/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/NovaKnightZer0/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSS
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http://www.instructables.com/id/DIY-Bike-Generator/
Althenuker says: May 14, 2014. 6:47 PM REPLYYou don't need to
take apart your ebike. After you place the rear axle on the
trainer, just disconnect the power line that goes to the motor and
hook it upto the 12 V battery. Mount a voltmeter on the handle bars
and monitor the output voltage from the motor while cycling on the
trainer. Just pedal hardenough to keep the charging voltage below
about 14.5 V to prevent overcharging the battery. I think this is
the maximum charging voltage for caralternators. At this charging
voltage, my output was about 60 W.
Althenuker says: May 14, 2014. 5:32 PM REPLYIt's great to see
projects like this in support of bike generators. Well done!
However, you really need to look closely at your project from the
energyproduction and consumption standpoint. I built a bike
generator using a 350 W BIONX motor from my electric assist bike
last Dec during an 8 day ice stormpower outage. The best I could do
was to generator 60 W for about 10 minutes before I was whipped.
I'm sure you younger fellas could do better than me. Iused it to
charge my 12 V deep cycle battery, charge my cell phone from a USB
port connected to a standard 12 V cigarette charger and run my 12
Vinternet satellite modem. After a couple of days, I was really
beat and my 12 V battery was depleted. I reluctantly had to give it
up and charge my batteryusing my truck while driving to the grocery
store. Nevertheless, it was an interesting project and actually
kept me warm during the frigid weather. Good luckwith your project,
but to get increased power you need several cyclists pedaling while
hooked up to the same generator.
xarlock667 says: May 14, 2014. 1:05 PM REPLYI'm going to be a
bit rude, so I apologize in advance: But WHY would you go to so
much trouble to charge a cell phone? You have almost 200 worrth
ofequipment there that you could have put to MUCH better use. It is
not an entirely worthless concept, but make it a LOT more useful by
using a rectifier andmaking it put out 120v AC. That way you can
charge several phones at once, perhaps a laptop or run a TV, etc...
Good try.
SKSW47 says: May 14, 2014. 4:13 PM REPLYThe inverter has a
standard plug for it as well. You could technically charge a laptop
with the basic set up, but we are planning on putting it in our
studentunion and figured people would mostly like to charge cell
phones. Thus, we only used a MOSFET rated for lower current because
that is what we hadlying around. If you omitted Arduino part of the
bike, you can charge many other things as well.
Squidyman says: May 14, 2014. 1:08 PM REPLYBecause you can
XD
xarlock667 says: May 14, 2014. 2:09 PM REPLYIn all fairness,
"Because you can" is the best reason to do ANYTHING. Therefore, you
win.
loachridge says: May 13, 2014. 8:07 PM REPLYWhen I was younger;
dont go to far into that; I remember bike head lights being run
from a generator attached to the bike.
A simple lever would lower the pulley side down onto the tire.
That would generate enough to power a pretty good head light. Or is
it headlight?
You could use the same principle here. Put another wheel, or
something round rubber, on the generator. And work the mounts to
take any bike. That wayyou can actually ride your bike. Or just
like the old ones, mount the generator to the frame.
Squidyman says: May 14, 2014. 12:55 PM REPLYThere is a lot of
efficiency lost by relying on the tire to turn a small motor
mounted to your bike. It would work, but it would take a long
time.
loachridge says: May 14, 2014. 1:46 PM REPLYI will disagree with
you for now. I like to be "proven" wrong. ;-)You have the materials
all right there.Why not give it a shot. It worked well in the
'80s.And those things weren't made for efficiency.Consider it a
challenge for you.
Squidyman says: May 14, 2014. 3:10 PM REPLYI may take you up on
that challenge. I do have all the parts required.... But the 300
watt motor I have is quite heavy so the bike might have toremain
stationary until I find a smaller one......
Now to get my parents to let me take apart that old electric
bike XD
Random thought..... It would be awesome to be able to run a
Raspberry Pi and a small screen off of the bike. If you stop
pedaling, your computerturns off!
Squidyman says: May 14, 2014. 3:11 PM REPLYAnd consider that the
motors on those bikes were probably 5 watts or less.
http://www.instructables.com/member/Althenuker/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Althenuker/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Althenuker/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Althenuker/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/xarlock667/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/xarlock667/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/SKSW47/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/SKSW47/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/xarlock667/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/xarlock667/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/loachridge/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/loachridge/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/loachridge/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/loachridge/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Squidyman/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/DIY-Bike-Generator/?utm_source=pdf&utm_campaign=comments#DISCUSS
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http://www.instructables.com/id/DIY-Bike-Generator/
dark-shot666 says: May 14, 2014. 2:52 PM REPLYThat looks like
someone would have to put a fair bit of effort to keep the wheel
spinning.
Have you considered adding on a freewheel to the rear wheel? Add
on another 10-20 pounds so that when you take a break from
pedaling, the wheel won'tlose nearly as much rotational speed from
the momentum stored in the freewheel. Just an idea.
Solid project otherwise! Great work.
beewrangler says: May 14, 2014. 2:46 PM REPLYThis is a great
idea, but if you are only using it to charge USB devices why would
you use an AC inverter? The USB standard is 5Vdc. You are loosing
aconsiderable amount of energy in the conversion from 12Vdc to
115Vac and then back to 5Vdc. Why not start with a 6V battery and
use a zener diode todrop down to and maintain a constant 5Vdc
output to a standard USB outlet?
Squidyman says: May 14, 2014. 1:10 PM REPLYA bit of
advice....
Make an easier to understand chart on how everything connects
with one another.
Nice project!
TorBoy9 says: May 14, 2014. 10:11 AM REPLYVery interesting
build, and you've done a lot of work.
You might consider adding a fender to the rear wheel so that
scarves and other loose clothing will not get caught in between the
belt and the rim. The rearstand will need to be permanently screwed
down to the base, otherwise with natural cycling movement there
will be a loosening of the belt, resulting in lessefficiency.
A front handlebar bag that has a metal frame could be changed to
support a flat surface, which will allow the use of a tablet or
smartphone while riding.
Overall a very interesting build.
bugsy_malone 666 says: May 14, 2014. 12:23 AM REPLYI think this
is a good way of testing a concept as a bike generator has some
potential as an overall power source for small devices. As
mentioned it would begood to be able to ride the bike as a bike
though as well(maybe build one for yourself), so the next stage
would maybe to fit everything you have there actuallyto the bike,
then you could go out for a cycle and come back with a charged up
battery that you could then plug in a car type mobile phone charger
to. Bit of anextreme measure to charge a phone but you get the idea
:) or keeping you design as it is, try different motors/generators
in place of your scooter one, forinstance a car alternator needs to
only spin at about 1000rpm to cut in, and they put out a fair wack
of power when connected to a battery, then you couldconnect a mains
invertor and run a laptop or something without barely touching the
battery, although I dont know how much strain an alternator might
put on therider! I have thought about building a similar to test
the car alternator theory! The advantage with the alternator is you
dont need all the various chargecontrollers, you just have a light
which goes out when your up to speed (which can be replaced with an
LED/resistors) making it slightly more simple.
xtracycletony says: May 13, 2014. 12:12 PM REPLYCouldn't you
have replaced the rear cassette with another smaller pulley and
reduce the overall size of the belt? The wheel technically wouldn't
be needed,just the hub.
Great project over all though. Nice work.
SKSW47 says: May 13, 2014. 7:15 PM REPLYThe large diameter of
the back wheel provides the 2800 RPM that the motor is rated at. It
is the big to small ratio that lets us spin the motor fast enoughto
create a large voltage.
Mesa_Arch_Man says: May 13, 2014. 4:13 PM REPLYSpelling error
throughout article, nice job though.
Peddling is for drugs, pedaling is for bikes!
Maybe get the Arduino to display stats to the rider like
estimated calories burned and a high score for the best (fittest)
charger!
SKSW47 says: May 13, 2014. 7:13 PM REPLYThanks! We'll fix that.
Good Idea for the Arduino.
manuka says: May 13, 2014. 4:33 PM REPLYGood idea, but capable
of producing ~50-100 Watts (which is far more than a modern cell
phone requires). If you just want to charge a phone then a
simpler& cheaper solar charger (running into a simple storage
battery of course) will usually do OK. An A4 sized 5Watt PV
typically produces ~10-20 Watt.hours perday in even average
lighting, which is good enough for daily charging of 2 smart
phones. There are now numerous such PV designs around
ofcourse,although many "Altoid Tin" versions are too puny unless in
bright sun.
Us humans are capable creatures & our legs & hands are
better suited to more crafty purposes when needing exercise-
gardening, child minding, dog
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http://www.instructables.com/id/DIY-Bike-Generator/
walking, wood chopping etc !
Fyodor says: May 13, 2014. 12:51 PM REPLYdc to ac to dc,..that
should burn off some extra calories. This is a great project for a
high school,..but the first time someone gets a finger stuck in the
spokesthe Nanny State will shut it down,..if you're in California
or New York, that is.
grrr21 says: May 13, 2014. 12:40 PM REPLYvery cool, well
written, I need to do this
JanVissinga says: May 13, 2014. 12:10 PM REPLYinstead of a
plexiglass stand I recommend using a music stand for the same
purpose; easily repositioned and also allowing you to lay down on
the steeringwheel. Even a tablet and book at the same time can in
that case be used.
This winter, using a music stand, I made my km's training for
the spring rides, watching television and more.
kzaccone says: May 13, 2014. 10:11 AM REPLYIs there any way to
make this produce more elctricity, maybe with a larger motor, so it
could power something like a t.v.?
SKSW47 says: May 13, 2014. 11:31 AM REPLYYou could use a larger
motor and a larger battery, but you'd have to be pretty strong to
be able to power a TV. If you saved up the energy (ie biked for
4hours, but only watched for 20 min), that might work better.
Stan1y says: May 10, 2014. 1:11 AM REPLYis the inverter phase
really needed? All you are doing is converting 12v dc to ac mains
)110-240v ac depending pn your country) just so you can connect
atransformer and rectifier to knock it back down to 5v dc. would it
not be easier just to use car chargers and reduce it directly from
12v dc to 5v dc. or even tapyour battery to get two 6v dc supplies
which can then be reduced to 5v with less loss
SKSW47 says: May 13, 2014. 11:25 AM REPLYWe thought using the
inverter was safer while we were working on the project (and a cell
phone costs more than and inverter). But, it would beinteresting
and very do-able to remove the inverter.
chifin says: May 10, 2014. 5:35 AM REPLYWow!! Awesome... Perhaps
get some app developers to make a smart-phone / tablet app to wifi
(bt) control the Arduino functions... The device could bepositioned
at the handle-bars. The app could record the individual users cycle
time, charge amount, output amounts. Just going crazy here with
enthusiasmfor your project. :-)
SKSW47 says: May 13, 2014. 11:22 AM REPLYWe plan to put the
device on a panel on the front, and have a ledge to put homework.
There is a lot more to be done in terms of user experience.
RandyPerson says: May 10, 2014. 8:35 AM REPLYYour V-belt is
making a pretty tight turn around the small pulley, likely using up
energy while not making great contact. Many clothes dryers have a
directdrive where a very small pulley drives the large dryer drum
slowly, using a quite flat, very flexible and strong belt. Reverse
that setup and you'll have themotor zipping along with great
efficiency. Best part is, dead dryers are everywhere, so parts
should be easy to come by. You might even find a
spring-loadedtensioner device, making location of the motor less
critical, and maximizing wrap on the small pulley.
SKSW47 says: May 13, 2014. 11:18 AM REPLYThanks for the
suggestion! We'll look into it. We can always improve efficiency,
but the V-belt seems to be doing a pretty good job for now.
scifiguy451 says: May 11, 2014. 6:06 PM REPLYNice project. I
like the fact that it is there for common use.
Do you even need the inverter? The things you are charging are
going to be DC. So you are going from DC to AC (inverter) then from
AC to DC (devicecharger) and losing a little power both times. Most
small electronics use a USB plug to charge, so you could almost get
away with having only 5 VDC USBports coming off your battery.
Even laptops' power supply outputs are in the 9-16 VDC range,
but the problem there is they don't have a universal plug in. (And
some, like DELL, look tosee if the power supply is made by them.)
So if you could come up with a laptop plug adapter, you could do
away with the inverter.
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