Tesla
Powerwall 3
$9200
Released 2023
Best Home Battery Backup · head-to-head
Powerwall 3 vs PWRcell 2 (M3, 9 kWh)
A sourced, side-by-side comparison. Powerwall 3 is cheaper at $9200. Every spec and price links to its source.
Generac
PWRcell 2 (M3, 9 kWh)
—
Released 2024
Which is better: the Powerwall 3 or PWRcell 2 (M3, 9 kWh)?
The Powerwall 3 wins 1 of the 1 specs we compare head to head; the other wins 0.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Powerwall 3 | PWRcell 2 (M3, 9 kWh) |
|---|---|---|
| US price | $9200 | — |
| Brand | Tesla | Generac |
| Released | 2023 | 2024 |
| Usable capacity kwh | 13.5 | 9 |
| Continuous power (kW) | 11.5 | 5.2 |
| Peak power (kW) | 22 | 15.6 |
| Battery chemistry | NMC | NMC |
| Round trip efficiency | 97.5 | 88 |
| Scalable stackable | Yes | Yes |
| Warranty years | 10 | 10 |
| Backup transfer time ms | — | 50 |
| Weight (lb) | 287 | 394.1 |
Sources — Powerwall 3: thegreenwatt.com (verified 2026-08-01). PWRcell 2 (M3, 9 kWh): generac.com (verified 2026-08-01).
What's the difference between the Powerwall 3 and PWRcell 2 (M3, 9 kWh)?
Where the two actually differ on the specs we track (5 of 9). Matching specs are omitted.
- Usable capacity kwh: Powerwall 3 13.5 vs PWRcell 2 (M3, 9 kWh) 9
- Continuous power (kW): Powerwall 3 11.5 vs PWRcell 2 (M3, 9 kWh) 5.2
- Peak power (kW): Powerwall 3 22 vs PWRcell 2 (M3, 9 kWh) 15.6
- Round trip efficiency: Powerwall 3 97.5 vs PWRcell 2 (M3, 9 kWh) 88
- Weight (lb): Powerwall 3 287 vs PWRcell 2 (M3, 9 kWh) 394.1