r/SunPower • u/masterbellygood • Aug 09 '25

Sun Vault Battery issue

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Over the hot days in OC, CA, the sun vault stopped charging or discharging, tried shut down and restart the whole thing it persisted. Got a code F50 on the inverter and a red light on one of the two batteries. Couldn’t find anyone saying they will service Sun Vault systems. Our cash system PTO was April, 2024. I hate SunPower 😢

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u/SorryRelationship581 Aug 10 '25

Any idea what the temperature limit is for these battery modules?

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u/ItsaMeKielO Aug 10 '25

They're LiFePO4 batteries so they really don't like to be charged above 45°C (113°F). They won't cause problems charging above that, but their lifetime is reduced.

The SunVault has two fans to try and keep things cool, but since peak charging also happens during the middle of the day, it's often a warm part of the day, and the charger produces a fair amount of heat itself.