[dain254]

My first iterations of the "SSE CozE" were lead acid before I switched to lithium. From what I have learned, you simply do not have enough power for the weight you are trying to push around. My vehicle weighs a tick under 350kg and with an ME1507 I'm seeing decent performance having 30kw on tap (5:1 reduction, 65mph). Bottom line, with 48V and a heavy vehicle you will struggle no matter what the motor curve looks like. I've since gone to 100V. Even Motenergy's ME1003 would not enough motor... I'm powering a dirt bike with one now and it is barely enough motor for that! You can only do so much at lower voltage unless you put the amperage through the roof, and that golden 10kw motor likely will not like much over 200-300A. Just my $.02

 

[dain254]

A lot of the talk has been about the motor performance, which really isn't the issue IMO. The motor kicks out what you feed it! There are quite a few ways to increase the performance of your specific vehicle... some are cheap, some expensive, none are wrong, here are a few:

1. Cut weight - switch to a lithium pack, keep your 10kw motor & current controller

2. Increase controller amperage by buying more powerful controller, amps=torque. A 400 amp capable controller will help you get to 50mph

3. if you have 8 batteries, tie them all in series and increase to 96V (new controller too?), gear 10:1, more volts at same amperage = more power!

Your last assumption is innaccurate about lead acid batteries being able to actually deliver power... but the more amps you draw from lead acid the higher the Peukert gain (example: 100ah battery only lasts 20ah when you draw high amps).