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How does the Powerwall 3 compare?
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GridMatch assessment
Editorial take by GridMatch Editors
The Tesla Powerwall 3 is a permanently installed 13.5 kWh LiFePO4 wall battery with 11.5 kW continuous output, integrated solar inverter (6 MPPTs), and automatic whole-home transfer. Expandable with Powerwall 3 Expansion units (up to +40.5 kWh per unit). Requires a certified installer, permit, and lead time — the installed incumbent against box-shipped expandable stations.
What works
- Native 120V/240V output
- Expandable to 54kWh
- Automatic transfer / switchover path
- 0 ms UPS switchover
- LiFePO4 chemistry
Tradeoffs
- Requires professional installation and permitting
- Heavy at 287 lb
Full Specifications
Technical Specifications
Runtime Quick-Check
Runtime Quick-Check
Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.
Formula: (13500 Wh × 0.85) ÷ 1.26 kWh/day = 9.1 days. Continuous draw ≈ 3.2 days at full load.
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