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Old 07-13-2017, 11:41 AM   #110 (permalink)
samwichse
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Spicy Italian - '13 Fiat 500 Abarth

eBike - '94 Trek Mountain Track 820

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Quote:
Originally Posted by TexasElectric View Post
California98Civic
7/11 Update
I rode the eBike to work on Wednesday last week. I rode it for 14 miles the weekend prior and I did not charge it after riding. I got 35 miles to work (with 2 miles to go) and the bike died on me. More specifically the motor controller decided to turn off because the voltage was low. I pulled over immediately and checked the voltage, my multi-meter read (50.3v). I thought it was kind of weird that the controller would cut me off at 50.3v because 50.3v is above 48v. Maybe there is a setting I can adjust somewhere.
That's the resting voltage, but under load that's going to sag.

My 36v LiFePO4 system is 12s, with a nominal 38.4 volts (full charge voltage 43.8). That gives it space to voltage sag under load and stay over 36v. Yours is 15s, which is exactly 48v, so at nominal you're going to sag below that. I'm not sure about your controller/computer, but there should be a cutoff voltage setting (there was on my BBS02). You may need to drop this a bit since you're running so close to the metal if you want your full range.

EDIT: NM, looks like you switched to 16s partway through the build?

Last edited by samwichse; 07-13-2017 at 11:47 AM..
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