I made my blog solar-powered, then things escalated

Re:I made my blog solar-powered, then things escalated by ilyt on Monday April 17, 2023 @09:17AM (#35600179)

Nope. IIRC typical one is safe to discharge at -10 but needs to go to 0 to start charging.

I wonder whether there is some off-the-shelf controller that can do something clever like run a heater instead of charging battery till it gets up to temperature

There are some specialty ones that allow lower temps but that comes back to cost again

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Re:I made my blog solar-powered, then things escalated by andruby on Monday April 17, 2023 @11:52AM (#35602559)

There are some batteries that integrate temp sensors and heating pads: losing some energy to bring the battery up to operating temperature.

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Re:I made my blog solar-powered, then things escalated by amatecha on Thursday April 20, 2023 @03:42AM (#35637386)

Yeah one of the vendors I mentioned above sells batteries with exactly that functionality -- if the temperature is too low, the BMS disconnects and the heating circuit is powered by the incoming energy (whatever the source might be) until the cells are warm enough: https://www.canbat.com/product/12v-100ah-cold-weather-lithiu...

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