Home batteries

Tesla Powerwall 3× backup runtime

Name: Tesla Powerwall 3×
Brand: Tesla

20 h 15 min

of backup at a 2 kW whole-home load (100% usable)

40 h 30 min

at a 1 kW overnight load

8 h 6 min

at a 5 kW heavy load

At a 2 kW whole-home load, the pack runs for 20 h 15 min before it’s flat.

Halve the draw to 1 kW and the same pack lasts 40 h 30 min; a heavy 5 kW load empties it in 8 h 6 min.

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Specifications

Specs for this unit are being sourced — we publish a spec number only once two independent authorities agree on it.

Backup runtime by load and depth of discharge

Load	80% DoD	90% DoD	100% DoD
0.5 kW	64 h 48 min	72 h 54 min	81 h
1 kW	32 h 24 min	36 h 27 min	40 h 30 min
2 kW	16 h 12 min	18 h 14 min	20 h 15 min
3 kW	10 h 48 min	12 h 9 min	13 h 30 min
5 kW	6 h 29 min	7 h 17 min	8 h 6 min
7 kW	4 h 38 min	5 h 13 min	5 h 47 min

The highlighted row is a realistic whole-home load — the configuration in the readout above. Loads above the continuous power rating cannot be supported. Runtime is computed from the modeled usable capacity; exact spec sourcing is pending.

Assumptions

Backup runtime assumes a steady load and ignores inverter/round-trip losses; loads above the continuous power rating cannot be supported. Whether a battery is worth it financially is computed separately on the decision page. Spec values are placeholders pending two-source verification.

Sources

PLACEHOLDER — verify against Tesla Powerwall spec sheet + an independent measurement/source