KendallP wrote:
B's right. The Freedom is temp adjusted. It'll put out some fairly high voltage in the cold. Is that a problem?
Right again. I AM over 21. And funny... earlier today I was questioning how interested this old dog is in learning new tricks.
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Yes it is a problem. Turn off the temperature adjustment. The LI can "electroplate" the "plates" and then the batteries become an expensive door stop. There is no way to recover from that happening. Don't float charge, either.
The issue of low temperature is -4 f for discharge (-20 c). Charging should be avoided and slowed.
The ambient being 110f is exacerbated by the batteries warming themselves during discharge.
Look seriously at SiO2. They charge twice as fast as lead acid, do not require full recharging to 100% (except once in 30 cycles). They can be taken to the lowest state of charge over 600 times before they loose 20% of their capacity. They require no maintenance. They are wonderful for high loads as they can support 4 C continuous and 9 C for ten seconds. They can be used and charged from -40 to +65 C (149 f).
https://azimuthsolar.ca/silicon-dioxide-excellent-battery-performance-in-extreme-cold-conditions/and for taking care of them:
https://azimuthsolar.ca/getting-silicon-dioxide-sio2-batteries-charging-instructions/In short, SiO2 are a much lower initial cost than Battleborn, with about the same cost per cycle. If you "roll your own" LiFePo4, then Li becomes cheaper. What is ESSENTIAL for LiFePo4, is having a proper battery management system. It must be able to do a cold weather disconnect at -4 F.
