Temperature Question re LFP Batteries

Mountain Don

This is directed at those who are using LFP batteries....

In normal day to day use do the cells get warm? I am asking as if I was to use these I would need them inside to keep them above freezing in winter. However, we also have a warm 6 to 8 weeks in summer when I would not want them to add much / any heat to the interior. So that is the point of the question. Thanks

Ampster

No mine don't get warm. I only use 20% of the capacity during a normal 10 hour stretch. There is heat produced by the inverter and charger but not from the batteries.

PNjunction

They don't add any additional heat especially in our application where we are what is called "Sub-C" (very low current relative to the ah capacity of the cells) because our bank is sized appropriately - not to mention insanely low internal resistance. Once you get above about .5 to 1C, then you may notice some. If you ARE doing that kind of charging, then you are using an EV and not a solar housebank.

karrak

From my battery monitor since I started monitoring power just over a month ago I have had around 74.1 kWh go into the battery, 67.9 kWh has come out and the battery has about 1.5 kWh more charge in it so have lost around 4.7 kWh in around 45 days or around 100Wh per day(4 Watts continuous) which I assume ends up as heat. Gives an overall battery efficiency of around 94%, this includes the power used to run the battery monitoring circuitry.

Simon

inMichigan

My batteries also don't feel warm to the touch. I generally limit global charging to 0.3C. Four FLEXmax 80's generate the heat (and noise) for my equipment room.