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Battery Backup Runtime
Battery kWh plus load watts gives runtime in hours.
Hours runtime
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- Days at this load
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- Wh of storage
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- 10% reserve hrs
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FAQ
What loads run on backup? +
Lights, fridge, modem/router, fans, phones. Skip AC, electric stove, and electric dryer unless oversized.
Why usable vs nameplate? +
Batteries have a depth-of-discharge limit. A 13.5 kWh nameplate might have 10 to 12 kWh usable.