Quote:
Originally Posted by redpoint5
Interesting thought to replace the traction batteries with LFP. It can be done without modifying the BMS? I've had a LFP for the 12v battery in the Prius for the past 6 years so far. Haven't done any balancing either. It lives inside the cabin so it should be reasonably protected from freezing.
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No mod needed for the BMS since apparently 5 LFP cells work with the max/min voltages the Prius' BMS will deliver. So as long as your LFP cells can handle the current you should be good.
There's a guy over on the Prius Chat forum that has developed a LiFePO4 replacement kit for Toyota hybrids using the 6 cell "blade" or "sandwich" NiMH modules. I guess he's the guy that developed the Dr. Prius app. He's got a lot of seemingly well known Prius enthusiasts that have been testing his kits over the past few years that are all que happy with the result. The guy's sales pitch seems a bit flakey though and seems a bit apprehensive to give solid numbers.
For me temperatures as low as -30⁰F every year are common. Here close by we had a record of -60⁰F and I've personally been in -52⁰F weather here. It seemed like for many years we'd see -40⁰F for at least a week every winter. And well, I don't have a garage so if it's in the car it will freeze. When we had the Leaf we sure found out that if cold enough the car would go only 30 miles on a charge even with the heater off and trying to hypermile.