Quote:
Originally Posted by MetroMPG
Heated/insulated battery boxes are pretty common in northern EV conversions.
Regular use will also keep the batteries warm, especially if you use a timer so the car is topping up just before you're ready to use it. Charging generates heat (as does discharging), and there's a lot of mass in your battery pack -- esp. floodies!
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That will work well for lead acid.
The LiFePO4 cells put off surprisingly little heat.
I had my LiFePO4 pack almost get drained from leaving my running lights on at work one day (LED running lights all around saved my LiFePO4 batt from a deep discharge). So I pulled the Anderson connectors and threw them on our "big 12v battery charger" and brought them from nearly drained to full charge with about a 4C charge rate.
There was very little detectable heat build up and I only know this because I was afraid of too much heat build up so I kept checking them every few minutes. Then after about 20 minutes they were fully charged and barely any warmer.
On a side note I read that any charging done when the lithium battery stack its self is below 20'F can cause you to permanently lose up to 20% of your capacity in one charging.
I don't know if this applies to LiFe or LiCo, the article I read just said "lithium".
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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