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Old 02-23-2017, 11:29 PM   #2 (permalink)
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Join Date: Jun 2008
Location: Utah
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Civic DX (sold) - '97 Honda Civic DX
90 day: 34.15 mpg (US)

GTO (sold) - '04 Pontiac GTO
90 day: 22.62 mpg (US)

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Have you been on Endless Sphere? That's the place to go if you looking for the gritty details of ebikes.

You'll want to do groups of 5 parallel cells in series with each other. Makes balancing/protection easier and I believe there are several other benefits that I can't think of right now. On a related note, "48v" LiFePO4 batteries are 16s, not 15s. Helps keep you from hitting the low voltage cutoff of the controller if you're drawing a lot of power (probably not an issue with such a big pack), gives you more watt hours, and keeps the voltage higher throughout the discharge, allowing more power.

From my experience with my ebike and a ~16lb 48v 15Ah LiFePO4 battery, I highly recommend not mounting the battery to a rear rack. All that weight plus the weight of the motor back there makes for a bike that handles like garbage. If you decide to use a rear rack anyway, I would put half of the battery on each side as low as possible and do whatever you can to make the rack stiff.

Here's my ebike's build thread:
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