What SunPower storage means now
SunPower storage no longer refers to one simple product line. For many existing owners, it means SunVault, the SunPower-branded home battery sold with Equinox solar systems before the 2024 bankruptcy. For new U.S. solar buyers, it more often means Enphase IQ Battery systems offered through the rebranded SunPower platform.
The practical takeaway is straightforward: do not evaluate SunPower storage by battery capacity alone. Check the installation date, equipment model, warranty party, monitoring path, backup scope and financing structure before assuming what support or upgrades are available. SunPower Corporation filed for bankruptcy on August 5, 2024. Complete Solar purchased select assets in a transaction that closed on September 30, 2024, and Complete Solaria announced its rebrand as SunPower in April 2025. Those dates matter for every SunVault owner and for anyone comparing new storage proposals.
This article separates the legacy SunVault system from current SunPower-branded storage offers, then explains how homeowners and solar professionals can evaluate service, replacement and upgrade decisions without relying on the brand name alone.
Why SunPower storage became confusing
The confusion comes from a rare mix of product history and corporate restructuring. Legacy SunPower Corporation marketed SunVault as part of a vertically integrated residential solar experience. The system was presented as a solar-plus-storage package with SunPower Equinox, Hub+ equipment and mySunPower monitoring. After the 2024 Chapter 11 filing, the SunPower name continued under a different corporate structure.
SunPower’s acquisition FAQ states that the purchase of select SunPower Corporation assets did not include taking an interest in customer PPAs, leases, solar systems, batteries or other equipment installed before the September 30, 2024 acquisition date. SunPower’s warranty resources also distinguish systems installed before that date from systems installed and energized through Complete Solar, Blue Raven Solar or affiliates after the transaction. In practical terms, an owner with a 2021 or 2023 SunVault should not assume that current SunPower product pages describe the support path for that installed battery.
| Date | What happened | Why it matters for storage |
|---|---|---|
| 2020–2023 | SunPower-branded brochures and datasheets described SunVault storage for home solar backup and solar self-consumption. | These documents remain useful for identifying legacy equipment specifications, but they are not the same as current product offers. |
| August 5, 2024 | SunPower Corporation filed for bankruptcy and began an asset sale process. | Service responsibility, warranty remedies and project completion became contract-specific issues. |
| September 30, 2024 | Complete Solar closed the purchase of select assets, including certain Blue Raven Solar, New Homes and non-installing dealer assets, plus the SunPower brand and related intellectual property. | This is the key cutoff date used in SunPower’s current customer guidance. |
| April 21–22, 2025 | Complete Solaria, doing business as SunPower, announced the SunPower rebrand and ticker change to SPWR. | The active SunPower brand is not identical to legacy SunPower Corporation. |
| January 29, 2026 | SunPower announced a national battery storage initiative with Palmetto LightReach, The Cool Down and Enphase Energy. | Current SunPower storage messaging is centered on newer Enphase battery systems, especially IQ Battery 10C. |
What SunVault was designed to do
SunVault was designed to store excess solar generation during the day and discharge that energy later, particularly during outages, evening peak-rate periods or times when grid electricity was expensive. SunPower’s brochures described the system as part of an integrated solar package rather than as a standalone battery. That integration was a selling point when one company designed, installed, monitored and warranted the combined system.
The same brochures included important limitations. Backup performance depends on the energy stored in the battery, the wattage of connected loads, the duration of the outage, the battery’s ability to recharge from solar during daylight and weather conditions. SunPower materials also noted that essential appliances are selected before installation and that the energy storage system should not be relied on as a power source for critical medical devices. That caveat remains important for any home battery, not just SunVault.
Core SunVault specifications that still matter
Published SunVault specifications varied by document year and configuration, so owners should use the exact model numbers and installation paperwork for their system. The figures below summarize commonly published SunPower datasheet and brochure information.
| Feature | Published SunVault data | Why it matters |
|---|---|---|
| Rated energy | Earlier datasheets listed SunVault 13 and SunVault 26 at 13 kWh and 26 kWh DC rated energy. Later brochures also referenced 13 kWh, 19.5 kWh, 26 kWh and 39 kWh configurations. | Rated capacity helps identify the system class, but it is not always the same as usable backup energy. |
| Max usable energy | A 2021 datasheet listed 12 kWh for SunVault 13 and 24 kWh for SunVault 26. | Usable energy is the figure most relevant to outage runtime. |
| Battery chemistry | SunVault datasheets identified lithium iron phosphate, or LiFePO4. | LFP chemistry is widely used in stationary storage because of its thermal stability and cycle-life profile. |
| Backup power | Published figures included 6.8 kW continuous backup output for common configurations, while later marketing materials referenced 6.8 kW or 13.6 kW depending on configuration. | Power determines how many loads can run at the same time; capacity determines how long they can run. |
| Round-trip efficiency | A SunVault datasheet listed CEC weighted round-trip efficiency above 86 percent under specified test conditions. | Efficiency affects how much stored solar energy is available after conversion losses. |
| Warranty term | SunPower brochures advertised a 10-year warranty for SunVault storage. | The term is only part of the story. The available remedy depends on contracts, installation date and current support channels. |
Support checks for existing SunVault owners
If you already own a SunVault system, the first task is not choosing a replacement battery. It is documenting what you have. Gather the home improvement contract, installation agreement, financing or lease documents, permission-to-operate date, battery model numbers, inverter or gateway model numbers, photographs of equipment labels and any warranty PDFs you received at the time of sale.
The September 30, 2024 date should be highlighted in that file. Systems, batteries and other equipment installed on or before that date may follow a different support path from newer SunPower-branded systems. SunPower’s acquisition FAQ directs earlier customers to contract-specific channels, including lenders, financiers or SunStrong Management, depending on how the system was purchased or financed. That does not mean every SunVault owner has no recourse. It does mean the answer cannot be determined from the current SunPower homepage alone.
Monitoring is a separate issue. Some SunPower solar systems used Enphase microinverters and a SunPower-branded combiner box. SunPower’s customer guidance has noted that Enphase offers monitoring-related upgrade paths for certain SunPower solar customers. Battery controls, backup transfer equipment and the SunVault gateway are more complex than panel-level production monitoring, however. Before paying for any monitoring upgrade, SunVault owners should ask in writing whether the proposed change supports the battery, solar production data, home consumption data, firmware updates and service diagnostics.
For faults or degraded performance, avoid informal workarounds. A home battery is not a consumer appliance that should be rewired casually. A qualified solar-storage technician should inspect error codes, state-of-charge behavior, breakers, communication hardware, battery cabinet condition, transfer equipment and utility interconnection requirements. If the repair path is unclear, compare three options: keep operating the system as-is if it is safe, pay for a targeted service visit, or quote a full storage replacement with updated monitoring and warranty coverage.
New SunPower storage options and how they compare
Current SunPower storage pages focus on Enphase IQ Battery products rather than the older SunVault brand. SunPower’s January 29, 2026 battery storage initiative named Enphase Energy as the manufacturer of the IQ Battery 10C and described a program intended to make battery storage more accessible through financing and partner outreach. The announcement said the program was available in the 45 states SunPower services, with priority access for existing SunPower customers.
SunPower’s current IQ Battery 10C page lists a 10 kWh usable energy capacity, LFP chemistry, passive cooling, remote monitoring through the Enphase App, 7.08 kVA continuous output at 240 V, 90 percent AC round-trip efficiency at a specified test condition, and a 15-year or 6,000-cycle limited warranty with 60 percent capacity at warranty end. It also describes modular scaling from 10 kWh to 80 kWh and notes that compatible components may be required for some backup configurations. See also: clean energy.
The IQ Battery 5P is smaller and more modular. SunPower’s current product page lists 5.0 kWh usable capacity per unit, 3.84 kW continuous power, embedded microinverters, LFP chemistry, passive cooling, remote monitoring and a 15-year limited warranty covering up to 6,000 cycles. For backup capability, the page notes that it works with an Enphase Energy System when paired with the appropriate IQ System Controller.
| Comparison point | Legacy SunVault | Current SunPower Enphase options |
|---|---|---|
| Brand context | Legacy SunPower Corporation storage product. | Current SunPower-branded offering using Enphase IQ Battery systems. |
| Common capacity references | 13 kWh and 26 kWh in older datasheets; additional configurations appeared in later brochures. | 5 kWh per IQ Battery 5P and 10 kWh per IQ Battery 10C, with modular expansion depending on design. |
| Monitoring | Historically tied to SunPower’s ecosystem and Hub+ equipment. | Presented with Enphase App monitoring on current product pages. |
| Warranty message | Legacy brochures advertised 10 years; current support depends on contracts and installation date. | Current SunPower pages list 15-year limited warranty terms for IQ Battery products. |
| Main due diligence question | Who can service the installed system, and what warranty remedy remains? | What exact equipment, controller, backup scope and financing terms are included in the proposal? |
How to size a storage upgrade without overbuying
Battery sizing should start with the job the battery must perform. If the goal is outage backup, list the loads that must run, their running wattage and any motor-start surge. If the goal is bill management, review interval usage data and utility rate periods. If the goal is solar self-consumption, compare daytime solar surplus with evening and overnight demand. Many disappointing battery projects come from mixing up these goals.
Energy and power should be calculated separately. A 10 kWh battery may have enough stored energy for a night of light critical loads, but not enough power to run multiple high-draw appliances at the same time. Conversely, a system with strong power output can still drain quickly if large loads are left on. Reserve settings, weather, seasonal solar production and battery aging should also be included in the calculation.
Homeowners comparing SunVault repair with Enphase replacement should ask for a load-by-load backup design rather than a generic whole-home claim. The proposal should identify the backed-up panel, transfer equipment, expected runtime assumptions, surge limits, solar recharge behavior during grid outages and whether future EV charging, heat pumps or induction cooking will require more capacity. If financing is involved, compare the total payment obligation, escalators, performance assumptions and ownership rights, not just the monthly payment.
For broader market context on stationary batteries, backup design and solar-plus-storage trends, see our Storage coverage.
Frequently asked questions
Is SunVault the same as SunPower storage today?
No. SunVault refers to the legacy SunPower-branded battery system sold before the 2024 bankruptcy. Current SunPower storage pages emphasize Enphase IQ Battery products, including the IQ Battery 10C and IQ Battery 5P. The brand name is similar, but the equipment, support path and warranty framework may be different.
Did Complete Solar take responsibility for old SunVault installations?
SunPower’s acquisition FAQ says the purchase of select assets did not include customer PPAs, leases, installed solar systems, batteries or other equipment installed before September 30, 2024. Owners should check their installation date, contract type and financing documents before assuming which company or financier is responsible for service.
Is a 13 kWh SunVault enough for whole-home backup?
It depends on the home and the loads selected for backup. A 13 kWh-class battery can support essential loads for a useful period if consumption is managed, but high-draw appliances, HVAC equipment and long outages can exceed its practical runtime. Power output, surge capability and solar recharge matter as much as rated capacity.
Can a SunVault owner add an Enphase battery?
Possibly, but it should be treated as an engineered retrofit, not a plug-in expansion. The installer must evaluate the existing solar equipment, battery controls, gateway, backed-up loads panel, utility interconnection, permits and monitoring requirements. In some cases, replacement may be cleaner than trying to combine old and new storage platforms.
What should a new buyer ask before signing a SunPower storage proposal?
Ask for the exact battery model, usable capacity, continuous power rating, backup configuration, controller hardware, monitoring platform, warranty provider, workmanship coverage, service process, financing terms and upgrade path. Also ask whether the proposal is designed for outage backup, peak-rate savings, solar self-consumption or a combination of those goals.
The bottom line: SunPower storage can still be relevant, but the details matter more than the brand. Existing SunVault owners should begin with documentation and support-channel verification. New buyers should compare the current Enphase-based proposal on usable energy, power, controls, warranty and service accountability.
