Tesla Powerwall 3: Capacity, Output and Pricing From the Official Specs
The Tesla Powerwall 3 stores 13.5 kWh and delivers up to 11.5 kW from one unit. We break down the official specs, expansion options and pricing facts.
By Galactic News Editorial · Published 2026-11-07T15:51:32+00:00 · Updated 2026-11-07T15:51:32+00:00
Tesla Powerwall 3: Capacity, Output and Pricing From the Official Specs
The Tesla Powerwall 3 stores 13.5 kWh of energy. It delivers up to 11.5 kW of continuous power. It also carries a built-in solar inverter in the same cabinet. Tesla does not publish a fixed price for it. Cost comes as a quote for your home. This review uses Tesla's official specification pages only. Every figure below traces to them. Where Tesla publishes no number, we say so plainly. This is a research-based assessment, not firsthand testing.
Tesla Powerwall 3 capacity and output, from the official specs
Capacity tells you how much energy the battery holds. Output tells you how much it can deliver at once. The Powerwall 3 is strong on both for a single unit. Its 185 LRA load-start rating matters too. It describes the surge the unit can supply to start heavy motors. Think air-conditioning compressors and well pumps.
| Specification | Powerwall 3 (official) |
|---|---|
| Battery energy | 13.5 kWh nominal |
| Continuous AC output | Up to 11.5 kW (configurable: 5.8, 7.6, 10 or 11.5 kW) |
| Load start capability | 185 LRA |
| Maximum continuous charge power | 5 kW (8 kW with Expansion units) |
| Maximum solar input | 20 kW DC, across 6 MPPTs |
| Solar-to-home efficiency | 97.5% |
| Solar-to-battery-to-home round trip efficiency | 89% |
| Dimensions | 43.5 x 24 x 7.6 in (1105 x 609 x 193 mm) |
| Weight, installed | 291.2 lb (132 kg) |
| Operating temperature | -4°F to 122°F (-20°C to 50°C) |
| Enclosure | NEMA 3R; IP67 for battery and power electronics |
| Warranty | 10 years |
What does 13.5 kWh mean in practice? It is a solid overnight buffer for most homes. It can run essentials such as lights, refrigeration, Wi-Fi and selected outlets for hours. Running everything at once is a different matter. Heavy loads drain any battery fast. The 11.5 kW output is the headline here. Many rival units deliver far less from one box. High output plus the 185 LRA start rating is what lets one unit attempt whole-home backup.
A battery and a solar inverter in one box
Tesla builds the solar inverter into the Powerwall 3. The official specification lists six MPPT inputs and up to 20 kW of solar. Tesla's product page stresses the practical result. Each unit is self-contained with an integrated inverter. That means fewer parts and faster installation. It also makes later expansion easier, according to Tesla. For a new solar install, one cabinet does two jobs. For homes with existing solar, ask the installer how the systems will work together. Get that answer in writing before you sign.
Expanding beyond one unit
One Powerwall 3 may not cover a large or power-hungry home. Tesla's specification allows up to three Expansion units behind one Powerwall 3. That takes storage to 54 kWh behind a single leader unit. A system can also run up to four Powerwall 3 units. The documented maximum is seven units in total. Charge power rises too. It goes from 5 kW for a lone unit to 8 kW with Expansion units attached. Expansion is a real strength of this design. You can start with one unit and add storage later.
Installation and placement facts
The specification sheet covers the practical basics. The unit can be floor mounted or wall mounted. It is rated for indoor and outdoor installation. The enclosure carries a NEMA 3R rating. The battery and power electronics are rated IP67. Noise is listed as under 50 dB(A) typical at one metre. Connectivity runs over Wi-Fi, Ethernet or cellular. The Tesla mobile app is the customer interface. Built-in protections include arc fault detection and PV rapid shutdown support. None of this removes the need for a qualified installer. At 291.2 lb installed, this is professional work, not a DIY lift.
Tesla Powerwall 3 pricing: what we could and could not verify
Here is the honest part. Tesla publishes no fixed Powerwall 3 price on the official pages we reviewed. There is no list price to quote you. Tesla sells the unit through its own design and quote process and through certified installers. Your price will bundle the hardware with a backup gateway, electrical work and permits. Those site costs vary widely between homes. So any single dollar figure from a review site deserves suspicion. Ask for an itemized quote instead. One more pricing fact matters. The IRS says battery storage of at least 3 kWh qualified for the 30% Residential Clean Energy Credit. But only for installations through December 31, 2025. The IRS states the credit is not available for property placed in service after that date. Do not let a salesperson price a new install around a federal credit that no longer applies.
Bottom line
The Powerwall 3 earns its reputation on output. A single unit offering 11.5 kW continuous power and 185 LRA load starting is genuinely capable. The integrated inverter simplifies new solar installs. Expansion to 54 kWh behind one unit is generous headroom. The weak point is price transparency. Tesla will not tell you the cost until you enter its quote process. Get itemized quotes from Tesla and at least one certified installer. Compare them line by line. On specs alone, this is one of the strongest single-unit home batteries you can buy.