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Install GFCI plugs. [1]
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Buy a small, appropriately sized UPS.
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Profit?
Disclaimer: Am not actually electrician. Just know this about GFCI from electrician friends and pointing to a decent explainer.
GFCI plugs can be installed without a ground wire. https://diy.stackexchange.com/questions/225370/i-live-in-an-older-home-without-ground-wiring-is-it-safe-to-install-3-prong-gfc ↩︎
For sure, a fridge is a really bad one to be using on an actual ungrounded GFCI, exactly for the reason of risk of expired food.
I like my homeserver but if something trips and its offline for a while it’s not gonna ruin my day.
The battery can be recharged eventually unless it’s already be discharged many times or it’s left alone and dead long enough to kill any ability to recharge it.