The Home Battery ReportIndependent · No installer money
LFPWhole-home capablediscontinued

SunPower SunVault

Heads up: this model is effectively discontinued. We keep the page for reference, but see the verdict before buying one new.

Effectively discontinued: after SunPower's 2024 bankruptcy the surviving brand does not sell SunVault new and steers buyers to Enphase, so we do not recommend it as a new purchase.

Best for: not recommended new
Figure - Specs to scalebars vs the largest in our database
SunPower SunVault: specs to scaleHorizontal bars comparing usable capacity, continuous power, peak power, warranty for SunPower SunVault, each scaled against the largest value in the home battery database.Usable capacity12 kWhContinuous power6.8 kWPeak power10 kWWarranty10 yr

Specifications

Chemistry
LFP
Usable capacity
12 kWh
Continuous power
6.8 kW
Peak power
10 kW
Round-trip efficiency
86%
Depth of discharge
Not published
Warranty
10 years (OEM support disrupted after the 2024 bankruptcy)
Scalable to
13 kWh base, expandable to 26 kWh
Backup scope
Whole-home capable
Inverter
Integrated
Weight
528 lb
Dimensions
64.5 x 26 x 14.8 in

Efficiency basis: CEC weighted round trip. Round-trip numbers are only comparable across brands when measured the same way, so read the basis before comparing.

Source: SunPower SunVault ESS datasheet, RevC 2021; SunPower acquisition FAQ, 2024. Specs verified 2026-07-01. Figures are per single unit at beginning of life; confirm the current datasheet with your installer.

Specs do not tell you if it pays off.

Payback depends on your rate plan, usable capacity, and local incentives, not the brand on the box.

Run the Worth It calculator →