docnjoj wrote:I ride a trike and you really want to mount batteries under the seat if possible. The handling is greatly improved over putting them in the rear rack. I have a 50 kilo rear rack but when I put my 20 lb Ping or even my 15 lb Bosch pack there the handling really sucked! Lower and centered is definitely better. I use a Lexan rack that I made with a split Ping that I rebuilt from a brick. Ping will make split battereis if you ask him. My next battery will be Lipo (12s 2 or 3p) but still mounted low. Feel free to ask as many questions as U need to! Actionbent makes decent trikes at good prices! Check out how FFR trikes mounts theirs!
I do like the trike, and my budget for the e-build is over double what I paid for it.
RallySTX wrote:That's better, I believe that's a 12s4p pack split for mounting. With a 24 inch rear 9C 2807 you should see better than 20 mph, for at least ten miles. Have you learned about bulk chargeing yet? I would still just use two of these.
http://www.hobbyking.com/hobbyking/stor ... duct=11170
It means disassembling the pack for chargeing, but you see what's happening. Mabye a smaller controller would give a ping battery an easier life. You would be able to charge the pack on the bike, but you would need to pedal once in a while, on hills and for take offs to conserve power. You should get a controller with the Cycle analyst port, and the CA with the dual Cycleluminator LED lights. Expensive but good!. My 2 cents.
I like your idea about mounting your batteries. If you run into problems you might consider what I have done on my pocket catrike. I built 2 boxes made from star board. They are mounted on the chainstays. The bottom of the boxes are about 3 1/2" above the ground. I effectly improved the CG to better than a new trike.
I just noticed that your trike has a steel frame and that is really good for a hub motor. I have an alternative battery to my 36 volt Ping and it is a 54 volt Bosch tool battery. With that and a 9C I can top out at about 24 mph with a 20 inch rear wheel. I think you wil have a problem off the line with the 2806 and the 700C wheel. The torque will not be great. You will however have a higher top speed. Don't forget torque arms whichever system you use.
That's odd to me. The ebike.ca simulator only shows about a 1-3 ft/lbs of torque loss going from the 2807 to the 2806 wind, but almost a 5 mph gain on top speed, and efficiency. Meanwhile the 2805 hub raises my top speed to about 48mph, but drops the torque to about 48 also.
I asked Justin @ ebike.ca about the rear torque arm - he said it's not required on a steel frame such as mine?
docnjoj wrote: Well Justin is the man when it comes to electric bikes. I have personally spun 3 motors in steel dropouts and not one since I started using torque arms. Perhaps the old steel suspension arms were of poor quality? My wife has a delta trike and we use 2 torque arms on her front steel fork! Better safe than sorry.
Matt (Recumpence) is a world class machinist and makes some great products!
I only use 20"wheels and the 2807 really gets off the line fast, with wheelspin, if I want. As you would expect the top speed is a bit limited but I prefer the torque when getting away from stop signs or crossing busy intersections.
I have alot of experience building electric tadpoles. I can give you whatever info you need regarding handling and what-not. I am also familiar with AB, though not with their trikes.
I would steer you toward a hub motor to start with because they are easy to deal with. Lipo is actually a good choice because the new chemistries are very tolerant these days. You can bulk charge. There are 12S charger out there. But, it is good to gain as much knowledge as you can about lipo to be sure you know what you have.
PM me if you would like my phone number (are you in the US?) and we can talk directly.
[/quote]Were all your motor spin outs in a front fork? I'll try and track down a rear torque arm anyway. I have to over engineer things now to help prevent my own idiocy later down the road.
Yeah, the more I obsess over this project the hub motor keeps coming back up, as it seems better sealed than most other options, and I don't want a fair weather trike. I'll PM you.
So to the other trikers - what's your preferred throttle? I *hated* the twist shifters that my trike came with. Are the thumb throttles easy to use on the vertical handlebars?
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