Tool

Battery runtime explainer

Illustrative only — estimates hours of essentials backup from usable battery kWh and continuous load watts. Not a design certificate.

Inputs

Nameplate × DoD. Example: 10 kWh at 90% DoD ≈ 9 kWh usable.

Lights + Wi-Fi + fridge + a few plugs often land ~400–700 W.

What a ~5 kWh usable pack typically covers

LoadApprox. WOn essentials?
LED lights (several)40–100Yes
Wi-Fi / ONT10–20Yes
Fridge100–150 avgYes
TV + decoder80–150Often
Kettle / geyser / stove2000–3000+Usually no

Heavy thermal loads belong on the grid or a much larger system — not a small backup board.

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