Long-Term Peace of Mind with Fortress Power Warranties

Choose from industry-leading warranty options—from 10 to 30 years—to protect your investment and futureproof your energy system.

When you invest in energy storage, you’re planning for long-term energy independence—and your warranty should support that. At Fortress Power, every battery and inverter comes with a standard 10-year warranty, giving you reliable protection from day one. Our C+I products come with the same 10-year warranty as well.

For added peace of mind, we offer extended warranties tailored to different needs: a 15-year warranty on the eForce battery when it is part of the eForce ESS, a 25-year extended warranty on select 48V products, and an industry-leading 30-year warranty option through Solar Insure that covers parts, labor, and more. Whatever your setup, Fortress Power ensures long-term support and dependable performance.

Durability you can depend on
Preservation of system value over time
Access to fastest possible support and repairs

Warranty Terms	Coverage Highlights	Best For
10-Year Standard	Factory warranty covering battery/inverter defects. Also applies to C+I products.	Owners looking for standard coverage
15-Year Extended	Adds 5 years of extended coverage on eForce batteries when installed as part of the eForce ESS	Owners seeking mid-term security on the eForce ESS
25-Year Extended*	Additional coverage across most 48V products	Owners looking for added long-term security through Fortress Power
30-Year Solar Insure**	Extended coverage available via Solar Insure	Owners looking for added long-term coverage on parts and labor

* Available for an additional upfront fee
** Installer must be approved by Solar Insure

10-Year Standard Warranty

All Fortress Power batteries and inverters come with a 10-year standard parts-only warranty when installed by a certified installer. This warranty covers defects in materials and workmanship and ensures your system performs within expected capacity thresholds over time. Technical support is included throughout the coverage period, giving you peace of mind.

In addition, all C+I products (eSpire series), also come with a standard 10-year warranty.

Learn More

Extended 15-Year Warranty (eForce ESS)

When you install a complete eForce Energy Storage System—consisting of an Envy inverter, eForce battery, and Guardian Gateway—the eForce battery qualifies for an extended 15-year warranty (or 8,000 discharge cycles at 80% DoD, whichever comes first). This exclusive coverage is available only when the system is installed by a Fortress Power certified installer and includes a transferable option for new homeowners.

Learn More

25-Year Extended Warranty (Select 48V Products)

Select 48V Fortress Power batteries and inverters are eligible for a 25-year limited parts-only warranty when registered by a certified installer. This extended coverage demonstrates the long-term reliability of our 48V product line and requires proper registration and installation documentation to remain valid.

Learn More

30-Year Limited Warranty with Solar Insure

Fortress Power customers can access an optional 30-year warranty in collaboration with Solar Insure. This third-party coverage goes beyond standard manufacturer warranties to include parts, labor, and transferability. Available for eligible systems, it must be registered within Solar Insure’s required timeframe and installed by a Solar Insure certified installer to take effect.

Learn More