How to build a 72Volt electric motorcycle
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1. As for inspection just took it to the local Honda dealer and they did everything as normal except emissions of course think insurance classified it as a normal bike but I d have to check on that again ramedia says Jul 18 2008 4 08 PM REPLY Keep an eye on Toshiba s SCIB batteries They supposedly recharge in 5 minutes This would be a big boon to electric bike builders and solve some of the range issues These batteries were supposed to come out in March of this year according to the press release last dec but haven t seen them M 26 7 says Jul 24 2008 6 53 PM REPLY 4 Those things sound awesome but from what hear Toshiba s only giving them to companies like ones making hybrid cars you might be able to 4 fenagle one or two out of them but the cost would more than likely be completely inhibitive of any actual purchase DjProToJeex says Apr 8 2008 12 10 PM REPLY ya id like to hear what insurance gives for if any difference for a EVB Stryker says Apr 8 2008 12 31 PM REPLY just looked it up and have a regular motorcycle policy but only liability no collision coverage DjProToJeex says Apr 8 2008 12 49 PM REPLY nice have a 05 gsx r1300 we are gutting for the hayabusa engine for a project car we are working on think instead of selling the frame i might make one of these Just to see how it would turn out beff50 says Jul 23 2008 7 39 AM REPLY why don t you add an alternator or something2. Volts Speed Direct drive like this is something better suited for motorcycles but not cars Kind of off topic know dillweed2 says Sep 11 2008 9 20 PM REPLY The only benefit of a trans would be that it would cut the speed of the motor The trans would also be extra weight and require more energy to overcome the drag from turning a trans bearings and gear lube Electric motors are not like a gasoline that requires more fuel at higher speeds The electric motor will run at a slower speed with a trans but will require the same amount of electricity as without a trans plus the drag of the trans for a net loss PY Pp le Stryker says Sep 12 2008 6 59 AM REPLY was thinking about a variable speed pulley system for my next bike The weight wouldn t be that much If the amount of electricity used was the same wouldn t get better starting power and top end speed 12 msee says Sep 12 2008 7 39 PM REPLY Full electric motor Torque can be available from O RPM up to rated speed which is GREAT for EV s Horsepower by definition is RPM x Torque so peak HP is not available off the line If properly designed top speed should be limited by resistance loss and drag A typical motorcycle and rider going 60 70 mph will need about 5 horsepower to maintain that speed on level ground Drag is dependent on velocity squared so 10 horsepower should be able to get a motorcycle and rider up to 85 100 mph Let s assume a vehicle is desi
3. if you have the money then a similar motor to recharge the batteries then it would increase the rand buy a lot despite how heavy it is uglymike says Jul 23 2008 7 53 PM REPLY The biggest problem with that idea is you can only charge a battery when it is not discharging you can t have voltage flowing both ways so it won t charge while your accelerating or cruising If you re running a brushless motor you can use a motor controller with regenerative braking This is the option used in electric and hybrid cars Unfortunately a regen braking does put force back on the motor and slows the bike as opposed to coasting The mass of the car works great for utilizing regen but it slows the lighter bike considerably greatly reducing it s efficiency More careful and conscientious driving habits offer greater improvements in range than regenerative controllers on light vehicles like this One thing you could do that is similar is to run a simple 1 2 wave alternator with a regulator rectifier and small 12volt battery instead of a DC to DC converter It would cost considerably less but the engineering involved makes the investment in the converter very appealing Phiber_Optik says Jul 23 2008 9 44 AM REPLY Sorry this won t work it s the whole perpetual motion thing The bike will use more electricity to power the alternator than it will return to the batteries An alternator generator would work only if engaged as regenerative down h
4. Image Notes 1 Optima batterys are sealed so they can be positioned in any direction Wiring If tried to explain where to connect every single wire would get writers cramp View the wiring diagram that put together and let me know if you have any questions This diagram should be pretty accurate to how built mine but obviously you are responsible for your project Wiring Diagram for The BEM Magura twist grip throttie Bold ines are 2ga wire Thin ines are 1490 Emeter 72V Prescaler 6 12V Optma batienes 4 connected in series J z ARrax Speed controler for 0 5K ohm throttle i l A i Ra il Seveon 72V 12V DC Converter to bike 12V system Zivan NG1 charger Image Notes Speed controller DC DC Converter Emeter 72V prescaler 400 ANN Fuse Shunt Battery connector covers make things look nice and keep you safe Lock washers are a must NOOR WD Image Notes Image Notes 1 Albright Contactors SW 200 gets 12 volts from system and allows you to use 1 Wire wrap makes things look professional your key to get full power 2 1 2 inch dense foam padding between each battery Image Notes 1 Just buy the throttle It s not worth trying to make your own Image Notes 1 If you have the money get one good charger instead of trying to use multiple smaller ones Image Notes 1 This meter has multiple settings but only use the volts I
5. about 12 miles when the batteries where new 30 Stryker says Sep 4 2008 11 36 AM REPLY fearblind says Sep 5 2008 9 17 AM REPLY actually ment the charge of the battery should have been more specific am sorry but curious at what voltage the battery is fully charged and what voltage you set the indicator to show dead am looking to build an electric motorcycle completely from scratch with custom frame etc and want to get an idea of the range of a battery cell s ability to move the bike effectively and what voltages you used to set your F and E on the fuel gage if you will msee says Sep 9 2008 8 01 AM REPLY fearblind suggest you research this site for details on batteries Slightly out of date but still useful http www batteryuniversity com parttwo 35 htm msee says Aug 29 2008 7 38 AM REPLY THANKS for posting your project for all to see VERY nice conversion job Even LOOKS like a real motorcycle With the components you listed calculations suggest you should be getting close to a 40 mile range You stated only 10 miles between charges Is that correct l Stryker says Aug 29 2008 8 54 AM REPLY It was over 10 when first got the batteries but since then they are taking less charge don t know what kind of calculations you did but can assure you it doesn t go farther than 10 miles I ve been researching Lithium batteries which will make a great improvement But until prices come down it s
6. any generator whether run from tire wheel friction a tiny windmill or otherwise will use more energy to spin them than they will return back to the batteries This is a net loss Physics will simply not allow it to work Even a little bit As stated earlier this would only work if used to capture kinetic energy from coasting down hill or coasting to a stop Then it must be disengaged when the main traction battery motor kicks in to power the bike Prophesor says Oct 3 2008 4 46 AM REPLY 4 These ideas only apply if we are talking about a constant recharge system What if you used a caliper style braking system but with rollers instead of brake pads and used the resistance provided by the regenerative system ONLY while braking The brake regen system would not be mechanically attached to the drive system at any point UNLESS you actively want to slow down you could still coast just fine The challenge would be how to keep the weight down Since you would already be using the hydraulics in the current brake system that shouldn t add any weight But you would have to design some fairly large calipers and you would need either 4 generators or a linkage system to transfer the mechanical energy It may also be worthwhile to use a true mechanical disconnect on the drive train to allow you to truly coast dillweed2 says Oct 10 2008 8 07 PM REPLY They already make regenerative motor systems as a dc motor is a generator This system wi
7. are connected in series pos to neg to increase the voltage Voltage is electrical pressure comparable to PSI in a hydraulic system The higher the voltage the better efficiency and performance of a product That s why you saw cordless tools go from 3V to 7V to 14V and now 18Volts Wiring in parallel pos to pos and neg to neg is how you jump a car battery Parallel increases the amperage or capacity of the system while keeping the voltage the same Flashlight batteries are connected in series a 5 cell would be 7 1 2 volts That s why electrical companies transfer power in thousands of volts less resistance is greater efficiency Stryker says Sep 22 2008 1 50 PM REPLY don t understand what you mean But I m no electrical engineer so doubt could answer it if did understand msee says Sep 25 2008 7 16 AM REPLY i Assume 12V deep cycle batteries Series Connection 6x12 72V 72V x 100A 7 2kW or 10 HP Designing a motor controller combination to handle this voltage and current range is pretty easy and relatively inexpensive There are MANY currently available Parallel Connection 1x12 12V 12V X 600A 7 2kW or 10 HP Although a DC DC converter can be designed to convert 12V 600A to 72V 100A it will add significant cost and weight and will reduce efficiency of the overall system A motor could be designed to use 12V 600A but it too would be less efficient because Resistive losses are a function of I I R so
8. close to my house And the bike didn t run so it only cost 600 If you have an old bike or someone will donate one then that s great but for the rest of us try the local paper junk yards Craig s List or ebay motors Motor After reading other EV bike specs and knowing that wanted to go faster than a moped chose a 72V Advanced DC motor because it s weight and dimensions where good for my frame ordered it online thunderstruck ev com from Batteries went with 6 Yellow Top Optima batteries from remybattery com because they are sealed and have received great reviews After making cardboard mock ups of the D23 model realized that there was no way six full sized batteries would fit and still look good ended up getting the D51 model Half the size and weight but also half the storage Controller You have to match your controller to your voltage but the amperage is up to your budget More amps more power and more cost It seems that there are only two real choices Alltrax or Curtis You ll have to decide for yourself but went with the 72V 450Amp Alltrax from cloudelectric Don t waste your time trying to build a potimeter on an old throttle just buy a pre made one and be done with it got the Magura 0 5K Twist grip throttle from cloudelectric com Charger You have to match your charger with your voltage but the speed of charge in Amps is also up to your budget went with a Zivan NG1 from EVAMERICA have recently switched to six
9. project keeping costs down and be fun to ride This project took about 3 months of research and development not counting waiting for parts to come in or help from a friend with the welding All in all it cost about 3000 to buy and build This may take a long time to pay off in gas savings but if you add the fun of building and all of the environmental benefits it was well worth the effort With a top speed of over 70 mph and 10 miles per charge this vehicle is perfect for me The following instructable will not give you exact step by step instructions but if you have some mechanical skills and welding ability you should be okay A little knowledge of motorcycle maintenance wouldn t hurt too However just read the user s manual and learned as went s Image Notes 1 Custom electric motorcycle logo made by my brother Thanks Ned step 2 Components and tools Every motorbike is different but the basic components can be the same Below is a list of the parts used and where got them but you will have to do some research to figure out what fits your bike and requirements Check out the photos at the bottom to see what bought and the EVAlbum for other electric vehicle projects Frame looked at many different bike styles and decided on a 1984 Honda Interceptor for a few reasons 1 like the style of bike not a total crotch rocket but not a hog either with room for batteries inside the frame 2 The seller on Ebay was
10. the wire and you have a net loss don t know exactly what the loss would be but it might an additional 1 or 2 amps to run the alternator You would not gain ANYTHING You would only make matters worse plus the added weight of the alternator and the extra batteries that you could not use while they are being charged You can t get something for nothing Even when a transformer is used to change a voltage up or down you have losses when some of the energy is changed into heat from the resistance of wires The idea of using a battery to run an electric motor turning an alternator or generator is a perpetual motion machine that has not been invented and in theory can never work A regenerative system is the only way you can recapture forward motion on braking and return it to the batteries neardood says Jul 13 2008 6 32 AM REPLY Oh man that is AWESOME wish i had one Although i am doubtful of the resources used to make all the parts batteries containing toxic chemicals welding electricity to charge used in production will oughtweigh the co t of petrol and thus enviroonmental benifit Keep up the good work and im looking 4WD to you re next creation ramedia says Jul 18 2008 3 49 PM REPLY Lo You are assuming your cost on your current fuel consumption is the price you pay at the pump Factor in things like 700 billion dollars to fight wars over access to oil in the middle east and you ll get closer to the cost of your curren
11. Image Notes 1 Bought on ebay motors in non working condition So don t yell at me about trashing a perfectly good motorcycle A ert 4 ms a E i ea Image Notes 1 Alltrax makes a very nice speed controller with configuration software Image Notes 1 Just buy the throttle It s not worth trying to make your own Image Notes 1 If you have the money get one good charger instead of trying to use multiple smaller ones Image Notes 1 DC DC converter is very easy to install Two wires in two wires out step 3 The build Start by removing all of those nasty internal combustion engine parts Remove the gas tank and using your grinder or other cutting tool to cut out the bottom This makes room for extra batteries or components Make sure all gas is out before cutting Reference your owners manual so that you don t cut any necessary wires and try to sell some of the parts to help pay for this project Next make cardboard mock ups of all of your batteries and electronic components to see how and where things are going to fit Take a look at my pictures to see how fit everything believe me that taking the time to make accurate cardboard mock ups is well worth the effort Now for the hard part You need a secure battery box and motor mount had a friend weld it up for me and he did a fantastic job From the photos you can see that he first strung up the motor to allow for minor adjustment to be made before cutti
12. as current increases resistive losses go up FAST The lower you can keep the current the better That is one reason why AC power is transmitted over the grid at very high voltages and then stepped down locally hawkeyejr says Jul 17 2008 4 50 PM REPLY Did any one happen to think how much more efficient this motor cycle would be if the drive motor were installed where the engine crankshaft was and the clutch and transmission were retained just a thought from some one who likes to take longer faster trips and why not add retain the alternator and recharge those batteries when there s no load Silence says Jul 27 2008 12 36 PM REPLY Alternator would hit the performance of the bike whole thermodynamics thing i wont start on For a variable speed motor you dont really need a transmission since electric motors have pretty much constant torque and can reach very high RPM Its optional but in the end it comes down to extra weight valuable space and batery life wraithsqaud says Sep 22 2008 12 55 PM REPLY i depending on the skill level of the builder and how low you are trying to keep the weight regenerative breaking could be added to recover some of the energy normally lost in stop and go kind of driving it might be a bit complex to incorporate into a bike fearblind says Sep 4 2008 10 38 AM REPLY was curious what your range is on your battery from fully charged to completely dead Check out my site for more details but
13. e TER Generator ona Halogen Bike Horn On Your Bike Lights by an Old Effects to your Mela b Gomi Style bike trailer for Light by Bicycle by geeklord Motorcycle Electric y y Electric Burning Man by smegger frenzy Save Money on Motorcycle by Kentucky bum Motorcycle veggiecycle Gas Fuel bennelson Conversion Cheap Ride by video by skunkbait sparkyrust Make a Custom Shirt at the Instructables Store Comments Add Comment view all 337 comments Jamiecrazy2005 says Aug 9 2008 1 58 PM REPLY Why is it that most think a transmission wouldn t be efficient on an ev motorcycle yes it is true that electric motors have almost constant torque and can reach very high roms but i think that is one of the problems with getting any form of mileage out of ev motorcycles To go faster u run the motor at a higher amp rating sucking more juice from the batteries Using a tranny will allow u to run the motor at a low amp rate at higher speeds using less juice form the batteries this would also save on motor life and overheating at high motor roms Electric motors due have a tendency to overheat and melt electrical components lo andrewl10 says Oct 21 2008 1 24 PM REPLY understand what you mean but there s also a down side to that A transmission is just one more thing loading down the motor so you will still end up sucking some decent amps out of your battery even at cruising speed A good thing to remember when doing a conversion is Amps Torque and
14. gned to reach top speed at peak HP at peak motor RPM A transmission would provide a better holeshot If you are designing a DRAG bike think you should definitely add a transmission If you are trying for highest efficiency and longest range don t see how a transmission will really help dillweed2 says Sep 12 2008 10 23 AM REPLY a The reason a trans or variable speed pulley is used for gas engines is because the engine develops different power and torque at different RPMS An engineer designs a vehicle to accelerate at a reasonable speed have a certain top speed and use a certain amount of fuel An dc electric motor is different because it develops power torque equally at all RPMS When designing the system you don t want to exceed the max speed of the motor but other than that it will require more electricity to move the added weight and overcome the added resistance of any belts pulley trans etc kiffer360 says Oct 17 2008 2 30 PM REPLY this is completely unrelated but have you people herd about the eestor capacitor just herd about it and it looks amazing just type in eestor in google and no am not trying to sell anything wraithsqaud says Sep 22 2008 12 49 PM REPLY is there an advantage to wiring the batteries in series and converting the voltage for the bike systems down instead of wiring them in parallel and converting the voltage up for the motor dillweed2 says Oct 10 2008 8 34 PM REPLY The batteries
15. ill misemono says Jul 23 2008 4 36 PM REPLY could you put 2 small generators with armatures that spin from pressing against the wheels kinda like those little gens that power a bicycle light on each tire so they can put some charge back into the batteries Yeah it would be a perpetual motion thing but would it put enough charge into the batteries to give you a few more miles dillweed2 says Sep 11 2008 9 05 PM REPLY No None Nada The drag or resistance to run the little generators will require the motor to work harder and use more electricity When used on a bicycle the rider provides the extra energy needed to run the generators A car engine requires a more fuel to run the alternator Only a regenerative system will change forward motion of the bike back into electricity but as mentioned by others being able to coast will give you more range beff50 says Jul 24 2008 7 16 AM REPLY gt im sure it would but i realized that the procedure to make this whole thing work would be so complicated that it would not be worth it but you could have a backup battery system and charge it like this that that would bring us to a weight factor but if your bike ran on li on ni hm then this idea might actually work but there is also the space factor so this might only work with an electric car Phiber_Optik says Jul 24 2008 6 50 AM REPLY All generators have magnetic resistance and need energy to spin them to create electricity Therefore
16. individual 3amp Soneil chargers to help balance the batteries DC DC Converter It s safest to run with a DC DC converter and an extra 12V battery backup but motorcycles have limited space so am only using the converter purchased a Sevcon 72V Input 13 5V output from evparts and it has working perfectly Fuses You ll want to get a fuse that matches your setup bought model ANN 400 w holder from EVAMERICA Contactor This is a device that you hook up to your existing key ignition on 12Volts and it will close the loop so you get the full power to your controller bought an Albright SW 200 from EVAMERICA Battery cable and connectors bought about 10 feet of 2 GA wire from WAL MART and cut it to length Using Lugs from cloudelectric soldered and used heat shrink tubing on each end highly recommend battery terminal covers for safety Instruments chose an E meter Link 10 w Prescaler add on for 72V use instead of a bunch of different meters As an added feature wired up the ignition switch to the neutral indicator to show me when the bike was on Other parts Wire 12GA different colors and heat shrink tubing large and small sizes Electrical tape Wire connectors Wire wrap Tools Basic shop tools are required such as a socket set screw drivers wire stripper etc Additionally a volt meter metal grinder and crimper are used in this project Image Notes 1 This meter has multiple settings but only use the volts
17. inst ructables The World s Biggest Show amp Tell Home Sign Up Explore Community Submit How to build a 72Volt electric motorcycle by Stryker on November 8 2007 Table of Contents intro How to build a 72Volt electric motorcycle sear es A 00 18 os ia alo Due oa ar Soe Dae ye eh ee ee Gs a ee Ge Ge Se a ee ae ee Be Oe 2 A VEY AU POW aa ea wae Sere casos ae ase EE ged ge vc hota a aed ms A re Meg eed ded ae oe Ges oo el ada E e Gee ae Ok ae ce E 2 sip 2 JGoOmpen nis and iool sesion ch drena edita ds heen ads bibs dea ds a oe oa dos dd e oY 2 Bie ae MINGHUI SR A A A A wr Se Sree ae 8 whee ae Sree eee 5 Step 4 Mina 8 step 5 kasi Tew MNOS asne eree nee dace ae rta ease aed hh e rad as beeen Ke A Ons a ded ieee onsen d wes 11 Rela lcd IS TUCIADI S ace asa a aa oa ee sa eye Maes Cheese ee Ieee wake eee ees haere wee ea E dee aa 12 POVEMISCINICIIRG serias rosa a oa se Ea oO OE ASA AAA AA RN 12 Customized Instructable TSHIAS c e ricas herria oie wie Ad di a a aa ci RE E a eae nea A di RA a we wR ae we E wo 12 Comments intro How to build a 72Volt electric motorcycle No gas no oil and almost silent 72 Volts 7Omph of pure fun This is how built an electric motorcycle step 1 Why and how only work 3 miles from home but with gas prices getting out of control thought it would be great to have an electric vehicle I ve always wanted a motorcycle and decided that making an electric motorcycle would be a good EV
18. just not going to happen iG msee says Aug 29 2008 12 41 PM REPLY Understood My calculations were based on the full size batteries and generous efficiency estimates My work commute is a 30 mile round trip so would attempt to build something similar if it could get 40 miles to a charge The newest Lithium technology is really nice but the cost is still way too high wonderbro says Aug 25 2008 9 24 AM REPLY For everyone who wants to make an electric motorcycle visit electricmotorsport com it has all the parts that you will need for this project SKINZ says Aug 2 2008 11 50 AM REPLY it looks mint youve done a brillent job can you ride it on the road without a licence ig jeff o says Apr 8 2008 9 44 AM REPLY Very nice work l m curious did you price out NiMH or Lithium batteries Obviously they would both be significantly more expensive but with a longer runtime ie greater range Also was the inspection all you needed to get this bike declared street legal and insurable Stryker says Aug 3 2008 9 40 AM REPLY No you need a motorcycle license to ride this It goes 7Omph so you can t get away with saying its a moped or something like that Stryker says Apr 8 2008 11 13 AM REPLY have been researching Lithium Polymer batteries for my next bike They are very expensive but are so much lighter and last longer So with the decrease in weight and recharging cycle life they might just pay off Eventually
19. ll add money and weight and it works well with cars that have much more weight than a motorcycle lt would be way less complicated than what you suggest Stryker says Jul 24 2008 7 22 AM REPLY Thanks guys for answering these questions don t plan on putting regen on my next one It s just not worth it for motorcycles 10 beff50 says Jul 23 2008 10 34 AM REPLY Y i am not saying that it will completely keep the batteries fully charged but i am saying it would make the bike go a lot further dillweed2 says Sep 11 2008 8 55 PM REPLY Lo It won t make it go farther It will reduce the range It is the whole perpetual motion machine thing You can t get something for nothing Phiber_Optik is exactly right beff50 says Oct 4 2008 9 56 AM REPLY 4 ok ok i have thought about this for a long time here is what i really meant by my idea get Li on bats then add an extra 3 bats and use the alternator to charge those bats when your voltage gets low flip a switch to disconnect some of the dead bats and connect the full ones so then the 2 or 3 that were disconnected can get charged up this would significantly incres your range dillweed2 says Oct 10 2008 8 08 PM REPLY Li Let s say you have a 10 Amp alternator The electric motor will require an extra 10 Amp draw to run the alternator plus the additional amperage to overcome the bearings alternator fan any belts or gearbox to drive the alternator and add in the resistance of
20. mage Notes 1 DC DC converter is very easy to install Two wires in two wires out A A ert 4 7 To o mer i at T E Image Notes 1 Alltrax makes a very nice speed controller with configuration software Image Notes 1 Here is the E meter nicely installed where the rom gauge used to be It will give you readings for Volts Amps Hours left and Time left Last few things Double check all of your connections and tighten every bolt wanted my bike to look as good as it rides so had all of the panels painted and custom graphics made up by worldsendimages Using a serial cable and laptop tweak the speed controller program for your riding preferences Lastly got the bike inspected and insured Be prepared for the dealership mechanics to swarm and hit you with a bunch of questions and jokes about failing the emissions test know these weren t step by step building instructions but that s because of the complexity of this project and variables in component use My intention was to give you the motivation to build your own by seeing how did it and make it easier by supplying the parts list and a wiring diagram For more photo s and a build commentary visit my website at http ben cbccinc com S Image Notes 1 Did my own prep work to save money but had them professionally painted Related Instructables Portable Solar Homemade Putting A Car Simple LED How to Revive Add Sound H il Ny ac eN ot
21. ng the motor mount plate After that was cut he made a nice chain and sprocket enclosure with a door and welded them onto the frame Next he fabricated the battery rack and gave each battery a swing arm closure to give a tight fit yet still allow me to get them out easily Half inch foam padding spacers are between each battery to help cushion the stack but believe me they aren t going anywhere The last thing he did was weld in metal plates for mounting my electrical components After you get your motor mount and battery compartment all welded up take some time to clean up the frame of your bike removed any rust spots and chipped paint that could find Then used some metallic gray and black spray paint This makes a world of difference and costs very little made a fake gas cap and ran the power cord from the charger up the frame and out the top Now that you have all of the welding done and your frame looks great let s install the electrical components and start wiring it up Image Notes 1 Moving six cardboard batteries is a lot easier than real ones Image Notes 1 Used thin rope to hold up the motor in just the right spot so accurate measurements could be made Image Notes 1 Battery rack has removable pins on each one to allow for a more snug fit and for easier removal of batteries Image Notes 1 Motor mount welded in place Image Notes 1 Sprocket and chain cover door swings open for easy maintenance
22. t fuel consumption The true price of gas is probably about 500 a gallon when you factor in foreign policy and reversing the damage to the planet costs Matt D655 says Jul 17 2008 6 07 PM REPLY Thats actually A pretty good idea no pollution Body4Change com says Jul 15 2008 10 56 AM REPLY Is there some type of formula to know how long the batteries will last want to put a 1000watt 36v motor on my bicycle have 3 12v 3 5AH batteries and was wondering if they would run it long enough to be worth buying the motor TIA SpokehedZ says Jul 17 2008 8 17 AM REPLY would need to know how many amps your motor draws at max load but we can work out using perfect values W V A or 1000w 36v 27Amps your batteries can supply 1 amp 12v for 3 5 hours Since they are in series you don t get any more MAh out of them just volts So electrically speaking your battery pack can supply 1A 36v for 3 5 Hours 210 Min 2A O 36V for 1 75 Hours 105 Min 4A 36V for 87 Hours 52 Min 8A 36v for 43 Hours 25 Min 16A O 36V for 21 Hours 12 Min 32A O 36v for 10 Hours 6 Min All values are approximate Also amps go up and down depending on load more weight more load so this will also be a factor Also on a bike you can pedal to get up to speed and use the motor to just keep you rolling a lot less energy used view all 337 comments
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