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Can you explain what happened?

So I talked to a couple battery sellers and they both said that their systems will automatically shut down to protect the battery at those temps, but they didn't recommend allowing them to get that cold, lest it violate their warrantee regarding "Excess environmental conditions" But looking...

Hello, first post. I built a small system for my off grid cabin including an inverter, charge controller, 2 100aH 12V Lead Acid batteries and 2 solar panels. Cost me well under $1000 This was fine for the last 2 years charging some tools, running a pump and some lights but I want more power...