SunPower SunVault discontinued: what owners and buyers should do

The SunVault was SunPower's own home battery, sold alongside its solar systems to homeowners who trusted a single well-known brand to own the whole install. Then the brand changed hands in a bankruptcy, and a lot of those homeowners discovered that the company on their paperwork and the company answering the phone are no longer the same company.

This guide separates what is documented from what is uncertain. Every external fact below is attributed to a named source, with the date we read it, and hedged where the source itself hedges. Specs come from our own SunVault model page. We checked all of these sources on July 30, 2026, and corporate situations like this one move, so verify anything you are about to act on.

What actually happened to SunPower

From SunPower's own acquisition FAQ at us.sunpower.com, read July 30, 2026: SunPower Corporation filed for bankruptcy on August 5, 2024 and began selling its assets. Complete Solar purchased some of those assets in a transaction that closed on September 30, 2024, including certain assets related to the Blue Raven Solar division, the New Homes division, and the Non-Installing Dealer division, plus the SunPower brand, trademarks, and related intellectual property. The same page announces that Complete Solar is now SunPower. Its warranty page names the buying entity as Complete Solaria, Inc. doing business as SunPower, and refers to the bankrupt predecessor as Legacy SunPower.

The single most important sentence for a SunVault owner is on that FAQ, and the company states it directly: the purchase of select SunPower Corporation assets did not include taking any interest in customer PPAs, leases, or in any solar systems, batteries, or other equipment installed before the September 30, 2024 acquisition date.

Read plainly, the company that owns the SunPower name today did not buy your battery's obligations. That is not a scandal, it is how an asset sale in bankruptcy usually works, but it is the fact everything else follows from.

What the SunVault datasheet says

For context on what the hardware is, here is what we record from the SunPower SunVault ESS datasheet, RevC 2021:

• 12 kWh usable capacity on the 13 kWh base unit, expandable to 26 kWh
• 6.8 kW continuous output, 10 kW peak
• 86 percent round-trip efficiency, on a CEC weighted round trip basis
• LFP (lithium iron phosphate) chemistry
• Integrated inverter, whole-home backup scope
• A published 10-year warranty term, which is where the rest of this guide comes in
• 528 lbs, in a 64.5 x 26 x 14.8 in enclosure

Nothing there is bad hardware. A 12 kWh LFP battery with 6.8 kW continuous is a perfectly reasonable whole-home or essentials backup unit on paper. The problem with the SunVault in 2026 is not the datasheet. It is who stands behind it.

Where your warranty actually sits now

Start by working out which of three buckets you are in, because the answer is different in each.

System energized before September 30, 2024, bought with cash or a loan. SunPower's FAQ directs you to contact your lender. That is a routing instruction, not a warranty promise, and a lender is not a service organization. In practice your realistic paths are the original installing dealer if it still exists and is willing, an independent solar service company that will work on the equipment for a fee, and the bankruptcy estate for any monetary claim. SunPower's FAQ points claimants to the estate administration site run by Epiq for money owed by SunPower Corporation or its affiliates.

System energized before September 30, 2024, on a lease or PPA. SunPower's FAQ tells you to reach out to your financier or to SunStrong Management. If your contract obligates the lessor to maintain and replace equipment, that obligation sits with whoever now holds the contract, which is the whole point of a lease or PPA: the hardware is not yours and neither is the maintenance risk. Get your contract out and read the equipment replacement clause rather than relying on a forum summary.

System energized after September 30, 2024 by Complete Solar or Blue Raven Solar. The current SunPower's warranty page says the warranties provided at the time of signing remain valid and its teams will service the system.

One observation from reading the current SunPower's warranty page, worth flagging honestly because it is an absence rather than a statement. That page publishes an "Equipment Warranties by Manufacturer" table naming who still honors what: Fimer for Aurora PVI models, Enphase for microinverters, Fronius for certain inverters, and Qcells, REC, and Waaree for panels. As of the date we read it, that table lists no battery manufacturer and no SunVault entry. We are not going to claim from an absence that nobody honors a SunVault warranty. We are going to say that if you are relying on a manufacturer-level backstop for a SunVault, the current SunPower's own public table does not name one, and you should ask for the name of the responsible party in writing.

Monitoring and the app

This part has moved, and there is a live action item buried in it.

From SunStrong Management's help center, read July 30, 2026: the SunStrong Connect app, formerly mySunPower, replaced the mySunPower application when SunStrong took over account management for 110,000 former SunPower customers. The web portal is no longer supported, so monitoring is mobile only. SunStrong lists the free tier as system health alerts, live system monitoring, SunVault management including battery settings and status, WiFi management, and firmware updates, with a premium tier at $9.99 per month or $99.99 per year covering historical performance data, panel-level monitoring on micro-converter systems, production and consumption analytics where a consumption meter is installed, and monthly reports. Lease customers, per SunStrong, receive the premium features as part of their lease service at no cost.

The action item: SunStrong's help center states that free cellular connectivity is no longer available for systems that used cellular communication for solar monitoring, that customers should have received notifications before the cellular deactivation in 2025, and that a system relying exclusively on cellular without an active cellular service subscription carries a risk of permanent hardware damage which may impact energy production. Its recommended fix is connecting via WiFi (2.4 GHz only) or Ethernet and keeping an active cellular subscription if the system must stay on cellular; per SunStrong, cellular is optional only as a backup for systems already on WiFi. If you have not opened the app in a while, that is the first thing to check.

Separately, Enphase runs a support program for what it calls Legacy SunPower systems, offering a monitoring kit that moves the system onto the Enphase app. Enphase's own FAQ page, read July 30, 2026, states that its monitoring kit is compatible with Legacy SunPower systems whether or not they have Enphase microinverters, and that it is compatible with SunPower storage systems that use Enphase IQ Batteries or Tesla batteries. It does not list SunVault in that compatibility sentence, and it says it has hardware upgrade solutions for legacy systems with non-Enphase inverters or third-party batteries and asks homeowners to call to discuss options. Enphase is also explicit that it was never a service provider to SunPower or its customers. So treat Enphase as a monitoring and upgrade path to ask about, not as an assumed SunVault answer.

SunStrong also runs a virtual power plant program, which its help center lists for Puerto Rico, the Northeast (Massachusetts, Connecticut, Rhode Island), and California. If your battery is enrolled or you are being invited to enroll, our virtual power plant explainer covers what you are agreeing to before you sign a master services agreement.

If you already have a SunVault installed

A short checklist, in the order we would do it.

1. Find your energization date and your contract type. Everything above forks on before or after September 30, 2024, and on cash or loan versus lease or PPA. You cannot route a service call correctly without both.

2. Get the system off cellular-only monitoring. Per SunStrong's stated risk of permanent hardware damage on cellular-only systems without an active subscription, this is the item with a real downside for doing nothing.

3. Read the equipment replacement clause in your lease or PPA. If you have one, this is where a funded battery replacement would live, and it is the strongest position a SunVault owner can be in.

4. Get the responsible party's name in writing. Whoever you call, ask them to state in writing what they will and will not cover on the battery. A phone reassurance from a call center is not a warranty.

5. Identify a local installer who will service the equipment for money. Not because you want to pay, but because knowing the fallback exists changes how urgently you need the warranty argument to succeed.

6. Do not assume replacement is like for like. The SunVault is discontinued. If the unit fails outside a funded contract, the realistic outcome is a different battery from a different maker, which means new equipment cost. Our battery comparison pages are where to start on what would replace it.

If someone offers you a SunVault today

Our verdict on the SunVault model page is that we do not recommend it as a new purchase, and the research above is why. The current SunPower's own battery storage page, read July 30, 2026, markets an Enphase battery rather than a SunVault, which tells you what the brand itself is selling.

If you are offered one anyway, from leftover inventory or a dealer clearing stock, these are the questions, and none of them should be answered verbally:

• Which legal entity is issuing the battery warranty, and can they put the entity name and the coverage terms in writing?
• Who supplies replacement parts for a discontinued unit, and what is the lead time?
• Which app will monitor it, and who controls that app's roadmap?
• What happens to the warranty if the servicing company changes hands again?
• What is the price against a currently supported battery of similar usable capacity from a maker still selling new units?

If the discount does not clearly exceed the risk that nobody funds a failure in year six, it is not a discount. And there is no federal tax credit softening the math in 2026 either way: the Section 25D residential clean energy credit expired on December 31, 2025, so a cash buyer gets $0 federal on any home battery this year. The only surviving federal route is a lease or power purchase agreement where the provider may capture the Section 48E commercial credit and reflect some of it in pricing, which is covered in our 2026 battery tax credit guide. Installed systems still commonly run roughly $10,000 to $20,000 before incentives, so run the numbers for your own home in the Worth It calculator before an orphaned model's discount starts looking like a deal.