36v 100AH or 48v 100AH???
- Thread starter sangesf
- Start date
Jeremy Harris
100 MW
You can't really run controllers in series, as they won't current share equally. You will have to run the controllers in parallel from a single pack, or split the pack in two and run each from its own half.
100Ah is a pretty big battery to fit on a bike, even in LiPo. If your motors and controllers are really only 250W each, then the endurance at full power for two motors drawing a total of 500W on 36V with 100Ah would be 7.2 hours (in practice it'd be a lot more, as you wouldn't be running at full power all the time) and on 48V 100Ah with the same 500W load the endurance would be 9.6 hours, with the same caveat as above.
Range depends on speed (7.2 hours at 30mph takes you a lot further than 7.2 hours at 20mph), but power used also depends to a large extent on speed. Generally, if you double your speed you multiply the power used by eight times, as a rough estimate.
Jeremy
100Ah is a pretty big battery to fit on a bike, even in LiPo. If your motors and controllers are really only 250W each, then the endurance at full power for two motors drawing a total of 500W on 36V with 100Ah would be 7.2 hours (in practice it'd be a lot more, as you wouldn't be running at full power all the time) and on 48V 100Ah with the same 500W load the endurance would be 9.6 hours, with the same caveat as above.
Range depends on speed (7.2 hours at 30mph takes you a lot further than 7.2 hours at 20mph), but power used also depends to a large extent on speed. Generally, if you double your speed you multiply the power used by eight times, as a rough estimate.
Jeremy
Drunkskunk
100 GW
36v X 100Ah = 3600 watt hours
48V X 100Ah = 4800 watt hours.
one battery is 25% bgger than the other.
Higher voltage is a little more efficent than lower, but not if the added speed increase means you spend most of your ride at lower throttle, since the controller is less efficent at part throttle.
I would never run them in series, always parallel.
48V X 100Ah = 4800 watt hours.
one battery is 25% bgger than the other.
Higher voltage is a little more efficent than lower, but not if the added speed increase means you spend most of your ride at lower throttle, since the controller is less efficent at part throttle.
I would never run them in series, always parallel.
John in CR
100 TW
With that 100lb or so of batteries, assuming they're not lead in which case you need more motor power, I would put a 20" wheel on the one that has a 24" so the motors share the load equally. If you can fit and afford the extra batteries I would definitely go with 48V.
Well I'm currently running 2 36v 20ah batteries and have a range of 80-115 miles depending on all factors..
I was thinking of running the 100ah, but after hearing I can't series the controllers, I'll just drop one of the 20's in exchange of a 40ah made with TS cells.
I was running the motors at different amperages/power, and I have a speed limiter of 20mph to make my bike legal in Florida.
So I'm not worried about power as I just want the range...
I was noticing that the rear was pulling 7a while the front was pulling 4.5a at the 20mph cruising mark
So, I'll put the 40ah one on the back and make it so that the rear will pull 8a max and the front will pull 4a max (I have two throttles)
I was noticing 80 miles at 20 mph and 110+ at 16 mph on my current setup.
I should be able to get 100+ miles at 20 mph and close to the 150 miles at lower speeds. (5 hour run time X 20mph)
I'm using a 5 amp charger and will have to up grade to a 10a charger for the 40ah batt.
My typical "fun ride" is from West Palm Beach to Miami and back, every other weekend.
I always charge it in Miami, but would like to get the round trip done without a charge needed.
I was thinking of running the 100ah, but after hearing I can't series the controllers, I'll just drop one of the 20's in exchange of a 40ah made with TS cells.
I was running the motors at different amperages/power, and I have a speed limiter of 20mph to make my bike legal in Florida.
So I'm not worried about power as I just want the range...
I was noticing that the rear was pulling 7a while the front was pulling 4.5a at the 20mph cruising mark
So, I'll put the 40ah one on the back and make it so that the rear will pull 8a max and the front will pull 4a max (I have two throttles)
I was noticing 80 miles at 20 mph and 110+ at 16 mph on my current setup.
I should be able to get 100+ miles at 20 mph and close to the 150 miles at lower speeds. (5 hour run time X 20mph)
I'm using a 5 amp charger and will have to up grade to a 10a charger for the 40ah batt.
My typical "fun ride" is from West Palm Beach to Miami and back, every other weekend.
I always charge it in Miami, but would like to get the round trip done without a charge needed.
jbond
100 W
- Joined
- Oct 1, 2010
- Messages
- 204
I can't help thinking that if you're after extreme range, you should spend the weight budget on a fairing, rather than on battery. A fully faired recumbent would likely get 3 times the range. Cedric Lynch is getting 150mile range at 50mph from his streamliner and 50V-100Ahr of Thundersky battery.
dogman dan
1 PW
Man, you like to ride!
Mabye keep the current batteries, and add 20 ah of lipo? Like a reserve tank, not paralelled with the lifepo4? Lipo real light and small. Unfortunately the really fast chargers for it aren't, but maybe you could just carry a power supply of the right voltage, and be able to fast charge the lipo to 90% charged pretty quick.
You wanna carry that much battery, eventually you want to go lipo, for the lighter and smaller pack.
My long range setup is a 36v 20 ah and a 48v 15 ah pings. But if I ever want more range, I'll put some lipo bricks in the pannier. Easy to carry two 5s or 6s blocks and have a little 5 ah reserve handy.
Mabye keep the current batteries, and add 20 ah of lipo? Like a reserve tank, not paralelled with the lifepo4? Lipo real light and small. Unfortunately the really fast chargers for it aren't, but maybe you could just carry a power supply of the right voltage, and be able to fast charge the lipo to 90% charged pretty quick.
You wanna carry that much battery, eventually you want to go lipo, for the lighter and smaller pack.
My long range setup is a 36v 20 ah and a 48v 15 ah pings. But if I ever want more range, I'll put some lipo bricks in the pannier. Easy to carry two 5s or 6s blocks and have a little 5 ah reserve handy.
