SunVault owner's next step: replacement and takeover options

Our SunVault status guide answers what happened: SunPower Corporation went bankrupt, Complete Solaria bought the brand, and the company that owns the SunPower name today did not buy the obligations on batteries installed before September 30, 2024.

This guide answers the next question. Your battery is a few years old, the company on your paperwork does not exist, and you want to know what your actual options are when it needs work or replacing. That is a different question from what happened, and it has better answers than most forum threads suggest.

Every external fact below is attributed and dated. We read all of these sources on August 6, 2026. We have not tested a SunVault or any of the replacement batteries; specs come from manufacturer datasheets recorded on our model pages.

First, work out which service path you are on

Everything forks here, so do this before you call anybody.

• Leased or on a PPA. You do not own the hardware. Replacement is a contract question, and the contract holder decides.
• Cash or loan, energized before September 30, 2024. You own an orphaned asset. There is no manufacturer to appeal to.
• Energized after September 30, 2024 by Complete Solar or Blue Raven Solar. The current SunPower's warranty page states the warranties provided at signing remain valid and its teams assist with troubleshooting and servicing solar or battery installations.

If you do not know which bucket you are in, your energization date and your contract type are on your original paperwork, and the status guide has the checklist for finding them.

Who actually shows up now

Three organizations appear in every SunVault conversation. Only one of them will send a technician, and it is worth being precise about what each has publicly committed to.

SunStrong Management is the operator for the lease and PPA portfolios. Its own description, from its help center, is an operations and asset management company that sits between asset owners and the real world where systems need servicing and customers need support. Its services page says it administers the original customer agreement, honoring the terms, managing renewals, and handling transfers across the full contract lifecycle, and lists field operations and maintenance with dispatched technicians.

The most useful sentence for a SunVault owner is on its homeowners page, and it is honest about its limits: if your system needs attention it handles it, remote diagnostics first and a technician on site when needed, and where an issue is not covered, it can help locate someone local to get you back online. Read that as what it says. There is a covered set and an uncovered set, and the boundary is your contract.

The current SunPower, legally Complete Solaria, Inc. doing business as SunPower, routes pre-acquisition customers away: cash and loan customers to their lender, lease and PPA customers to their financier or to SunStrong Management, with a phone number. Its published Equipment Warranties by Manufacturer table still names Fimer, Enphase, Fronius, Qcells, REC Solar, and Waaree, and as of our reading today it still lists no battery manufacturer and no SunVault row. We are not going to argue from an absence that nobody covers a SunVault. We are going to say that the current SunPower's own public table does not name anyone, so do not assume a backstop you have not seen in writing.

Enphase is on many Legacy SunPower systems as the microinverter supplier, and its Legacy SunPower support page is unusually clear about the boundary: Enphase has not been a service provider to SunPower or its customers and has not provided maintenance services for SunPower systems. What it does provide is warranty support for its own products, monitoring migration, a service plan, and upgrades. More on the upgrade route below.

What a takeover does and does not cover

"Takeover" gets used loosely in SunVault threads, and it means three different things.

Servicing takeover. SunStrong took over account management for 110,000 former SunPower customers, per its help center. Its help center also states that on transition your payment arrangements remain the same and there are no changes to your existing financing agreement terms, aside from escalators already noted in your contract and changes to sales tax. So a servicing takeover changes who answers the phone, not what you signed.

Home-sale transfer. SunStrong's homeowners page states it handles the contract transfer process in-house so it does not hold up your closing. On a lease or PPA, the thing that transfers is the agreement, with its remaining term and its escalator, and your buyer inherits both. If you are selling, start the transfer early and put the inherited payment schedule in front of the buyer in writing rather than at closing. Our lease and PPA explainer covers what those terms usually contain.

Virtual power plant enrollment. SunStrong's help center lists VPP participation in three regions, each governed by its own Master Services Agreement: Puerto Rico under Customer Battery Energy Sharing, the Northeast under ConnectedSolutions covering Massachusetts, Connecticut, and Rhode Island, and California under Demand Side Grid Support plus a Southern California Edison program. Rewards, it says, are typically issued as bill credits or loan reductions after SunStrong validates your participation and receives payment from its program partners. If you are enrolled, that enrollment is attached to a working battery, so a failure or a replacement affects it. Read the applicable MSA before you change hardware, and see our virtual power plant explainer for what those agreements typically ask of you.

None of the three is a warranty. A takeover moves administration; it does not create coverage that your original contract did not contain.

If the battery fails: what replacement actually means

On a lease or PPA. This is the strongest position, and it is worth being blunt about why: the hardware is not yours, so neither is the replacement bill, if your contract obligates the lessor to maintain and replace equipment. Find the equipment replacement clause. That single paragraph is worth more than every forum thread about SunVault warranties combined. Then ask SunStrong, in writing, whether a battery replacement falls inside the covered set for your specific agreement, and what unit would replace it. The SunVault is discontinued, so a like-for-like swap is unlikely, and you want to know what you would actually get.

Cash or loan, pre-acquisition. Replacement means buying a battery. There is no OEM to fund it, the SunVault is not in production, and parts for a discontinued unit are a thin market. Your realistic sequence is: get an independent solar service company to diagnose whether the failure is the battery, the gateway, or the communication path, because paying for a diagnosis is far cheaper than replacing a unit that did not need replacing. If it is genuinely the battery, you are in a new-purchase decision, which is the next section.

Post-acquisition installs. Route through the current SunPower's service request form and hold it to the warranties in your signed agreement.

Two structural notes that apply to all three. First, a battery is not the only thing that can fail: SunVault systems have a gateway and a communication path, and an offline battery is not necessarily a dead battery. Second, the cellular monitoring change SunStrong published carries a stated risk of permanent hardware damage on systems left on cellular without an active subscription, which is covered in the status guide and is worth ruling out before you conclude anything about the hardware.

What to match if you are replacing it

Here is the target, from the SunPower SunVault ESS datasheet (RevC, 2021) as recorded on our SunVault model page:

• 12 kWh usable 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 basis
• LFP chemistry, integrated inverter, whole-home backup scope

Those are the numbers a replacement has to meet if you want the house to behave the same way in an outage. The continuous figure sets what you can run at once; the peak figure sets whether a compressor or a well pump can start. Note the efficiency basis: 86 percent CEC weighted is not directly comparable to every number a rival prints, which is why our round-trip efficiency explainer exists and why we record the basis alongside every figure.

One more thing to check before shopping: whether your existing solar is AC-coupled with microinverters or DC-coupled through a string inverter. That decides which batteries retrofit cleanly onto the array you already own, and it is the first question any installer will ask.

The four replacement paths we would look at

These are the batteries in our tracked set that best match or beat the SunVault's published figures. Every number below is a manufacturer datasheet specification, not our test result, and each links to the model page where the source datasheet is cited.

• If you want every number beaten: the FranklinWH aPower 2 publishes 15 kWh usable, 10 kW continuous, and 15 kW peak, against the SunVault's 12 kWh, 6.8 kW, and 10 kW. It is AC-coupled and LFP, and its 15 year or 60 MWh warranty matches Enphase's 15 years as the longest term among the models we track.
• If your array is already Enphase: the Enphase IQ Battery 10C gives 10 kWh usable and 7.08 kW continuous, so it beats the SunVault on continuous power and gives up 2 kWh of capacity, with a 15 year or 6,000 cycle warranty. It is also, notably, the direction the SunPower brand itself went: the current SunPower markets an Enphase battery rather than a SunVault.
• If you want the swap to be one box: the Tesla Powerwall 3 publishes 13.5 kWh usable and 11.5 kW continuous with the solar inverter integrated. Two caveats we always attach to it: Tesla's 89 percent figure is a solar round trip rather than the AC to AC basis the SunVault datasheet uses, and Tesla does not publish the cell chemistry.
• If you would rather stage it: the Enphase IQ Battery 5P is 5 kWh usable, 3.84 kW continuous, and 7.68 kW peak per unit, so you can replace in 5 kWh steps instead of committing to 12 kWh at once.

The full set, including the models that suit a DC-coupled string inverter array rather than microinverters, is on our battery comparison pages.

There is also a fifth route that is not a battery purchase at all. Enphase's Legacy SunPower support page describes upgrades as adding more solar, integrating batteries, or replacing your entire system, and states that it has hardware upgrade solutions for Legacy SunPower systems powered by non-Enphase inverters or third-party batteries, asking homeowners to call to discuss options. It also publishes an Enphase Care service plan covering continuous monitoring, 24/7 technical support, and $0 on-site labor for covered repairs, available as an annual or 10-year subscription, for homeowners with Enphase microinverters or IQ Batteries connected through an IQ Gateway. If your array is already powered by Enphase, that is a coherent path back to a single supported system, and it is worth pricing against a standalone battery from another maker. Enphase publishes counts for this program on the same page: over 7,600 SunPower systems upgraded to Enphase and more than 1,000 upgrades in process nationwide.

We do not publish installed prices for any of this, because installed price is set by your panel, your wall, your permit office, and local labor far more than by the box. Our cost guide covers how to read quotes, and the honest instruction is to get three itemized bids.

What changes when you swap the hardware

Five things that catch people out, in rough order of how annoying they are:

1. Interconnection. Changing a storage asset generally means an updated interconnection agreement with your utility. Ask your installer who files it and how long your utility is currently taking.

2. Your net metering or net billing status. In several states, modifying a solar-plus-storage system can put your existing tariff arrangement in play. We are not going to make a blanket claim about what happens to your specific grandfathered rate, because it varies by state and utility. Ask your utility directly, in writing, before you sign an install contract, and see our NEM 3.0 explainer if you are in California.

3. Monitoring. A new battery generally comes with its own app, and your solar may end up reporting to a different platform than your storage. Enphase notes that even where its monitoring kit supports a system with Tesla batteries, homeowners should continue using the Tesla app to manage battery operations.

4. VPP enrollment. If you are in a SunStrong VPP program, changing hardware changes your enrollment, and the reward mechanism is tied to validated participation. Handle it before, not after.

5. Removal and disposal of the old unit. The SunVault weighs 528 lb per its datasheet, in a 64.5 x 26 x 14.8 inch enclosure. Somebody has to take it off the wall and dispose of it lawfully. Make sure that line is in the quote rather than a surprise on install day.

The 2026 reality on money

There is no federal cash for a homeowner buying a battery this year. The Section 25D residential clean energy credit expired on December 31, 2025, so a cash or loan replacement in 2026 gets zero federal credit. The only surviving federal route is Section 48E, claimed by the owner of the system, which means it can reach you only through a lease or power purchase agreement where a company owns the new hardware and may reflect some of that credit in pricing. Our 2026 tax credit guide has the detail, and our state pages cover what your state and utility still offer.

If you are on a lease today, that is worth sitting with. The contract that feels frustrating when you cannot get a straight answer about warranty is also the only structure in 2026 that still carries a federal credit into a residential battery.

What to get in writing

Whoever you end up talking to, none of this should be answered on the phone alone:

1. Which legal entity is responsible for the battery, by name.

2. Whether battery replacement is inside or outside the covered set for your specific contract.

3. If it is covered, what unit would replace a discontinued SunVault, and on what timeline.

4. If it is not covered, what a diagnosis costs before you commit to replacing anything.

5. Who files the interconnection update, and what your utility says about your existing tariff.

6. What happens to your VPP enrollment and your monitoring on the day of the swap.

Then run your own numbers in the Worth It calculator. A SunVault that still works is not an emergency. A SunVault that has failed is a purchase decision, and the same rules apply to it as to any other battery purchase in 2026.