Battery Comparison · 2026
Tesla Powerwall 3 vs Tesla Powerwall 2
Tesla Powerwall 3 launched in the UK in 2024 with major upgrades over Powerwall 2 — integrated inverter, 11.5 kW continuous output (up from 5 kW), LFP chemistry. If you're buying new, Powerwall 3 is the call. If you have Powerwall 2, here's whether to upgrade.
Our verdict
For new buyers: Powerwall 3 every time. For Powerwall 2 owners: don't upgrade just for the spec — your existing battery still works fine and is supported with firmware until at least 2030. Wait for Powerwall 4 (rumoured 2027) or until your Powerwall 2 capacity drops below 70% (warranty trigger).
Side by side
Spec by spec
| Dimension | Tesla Powerwall 3 | Tesla Powerwall 2 |
|---|---|---|
| Usable capacity | 13.5 kWh | 13.5 kWh |
| Continuous power | 11.5 kW | 5 kW |
| Peak power | 15.5 kW (10 sec) | 7 kW (10 sec) |
| Inverter integrated | Yes (4-string solar) | No (battery only) |
| Cell chemistry | LFP (newer prod) | NMC |
| Warranty | 10 yr / 70% | 10 yr / 70% |
| Backup gateway compatible | Yes | Yes |
| Storm Watch | Yes | Yes |
| Price (battery only fitted) | £7,400 | £8,200 (legacy stock) |
| New installs (May 2026) | Yes — current product | Discontinued |
Best for Tesla Powerwall 3
- New solar + battery installs
- Replacing failed Powerwall 2 units
- Heat pump or EV-heavy households
- Whole-home backup with gateway
Best for Tesla Powerwall 2
- Already installed (no upgrade reason)
- Smaller power needs
- Backup gateway already paired
Frequently asked
Common questions
Should I upgrade my Powerwall 2 to Powerwall 3?
Usually no. The improvements in Powerwall 3 (integrated inverter, higher power output) don't justify replacing a working Powerwall 2. Wait for it to fail, drop below warranty threshold, or until Powerwall 4 launches.
Does Tesla still support Powerwall 2?
Yes. Firmware updates continue, app support continues, parts available. Tesla has committed to Powerwall 2 support through at least 2030.
Can I add a Powerwall 3 alongside my Powerwall 2?
No — they don't mix. Tesla supports Powerwall + expansion units of the same generation. To go from 13.5 kWh to 27 kWh on Powerwall 2, add a second PW2. Powerwall 3 expansion units are PW3-only.
We install both — get a quote
Free survey, fixed-price quote, MCS certified. We fit 5 Powerwalls every week and we're an authorised EcoFlow + GivEnergy dealer.