About
Fortress Power is a leading provider of Lithium Iron Phosphate (LFP) solar battery storage systems for both homeowners and commercial & industrial customers. Their residential product lineup includes batteries like the eFlex MAX, eVault MAX, eBoost, and eForce, paired with inverters such as the Envy Duo 21, Envy True 12kW, and Solo 6.5K, giving customers flexible whole-home energy backup and off-grid living solutions. For commercial and industrial clients, Fortress Power offers the eSpire series (Nano, Mini, eSpire 306) to tackle demand charge reduction and large-scale energy storage needs. Homeowners and installers benefit from a suite of digital tools including a System Design Tool, PV String Size Calculator, and mobile apps for both owners and pros. The EnergyBroker program enables participation in Virtual Power Plant (VPP) initiatives, while the certified installer network ensures professional deployment nationwide. Fortress Power also supports customers with rebates & incentives guidance, warranty programs, firmware updates, and an education & training portal for installers. With over 50,000 installations and 500+ certified dealer partners, Fortress Power is a trusted name in residential and commercial energy storage, helping users achieve energy independence, reduce utility bills, and leverage solar self-consumption.
Key Features
- Scalable LFP Battery Systems: Offers a range of Lithium Iron Phosphate batteries (eFlex MAX, eVault MAX, eBoost, eForce) that scale from single-home backup to whole-home energy storage.
- Residential & Commercial Inverters: Pairs with a full lineup of inverters (Envy Duo 21, Envy True 12kW, Solo 6.5K, EdgeOn Duo) to support diverse installation requirements.
- System Design & Savings Tools: Includes a System Design Tool and PV String Size Calculator to help installers and homeowners plan the right energy storage configuration.
- EnergyBroker / VPP Program: Enables homeowners to participate in Virtual Power Plant programs, earning value from their stored energy through the EnergyBroker platform.
- Owner & Pro Mobile Apps: Dedicated mobile applications for homeowners to monitor their systems and for installers to manage projects and diagnostics on the go.
Use Cases
- Homeowners seeking whole-home battery backup to maintain power during outages or grid instability.
- Residential solar owners wanting to maximize self-consumption and reduce reliance on the utility grid.
- Households or businesses looking to reduce demand charges and time-of-use electricity costs with stored solar energy.
- Off-grid property owners needing a reliable, long-cycle-life LFP battery and inverter system.
- Commercial and industrial facilities deploying large-scale energy storage (eSpire series) to cut peak demand costs and participate in demand response programs.
Pros
- Proven Scale & Reliability: Over 50,000 installations and 500+ certified installer partners demonstrate a mature, trusted supply chain and deployment ecosystem.
- LFP Chemistry Safety: Lithium Iron Phosphate batteries offer superior thermal stability and a longer cycle life compared to other lithium chemistries, making them safer for home use.
- End-to-End Ecosystem: Provides batteries, inverters, enclosures, mobile apps, design tools, and installer training all under one brand, simplifying procurement and support.
Cons
- Hardware-Only Offering: As a physical product company, purchases require professional installation and cannot be self-deployed like software solutions.
- Dealer-Dependent Availability: Products are sold through a certified installer network, which may limit availability or pricing transparency in areas with fewer dealers.
Frequently Asked Questions
What types of batteries does Fortress Power offer?
Fortress Power offers Lithium Iron Phosphate (LFP) batteries for residential use, including the eFlex MAX 5.4kWh, eVault MAX 18.5kWh, eBoost, and eForce systems, as well as the eSpire series for commercial and industrial applications.
Can I use Fortress Power batteries for off-grid living?
Yes. Fortress Power's battery and inverter systems are designed to support off-grid living scenarios, providing reliable energy storage independent of utility grid connections.
How do I find a certified Fortress Power installer near me?
You can use the 'Find an Installer Near You' feature on the Fortress Power website to locate a certified installer in your area from their network of 500+ partners.
Does Fortress Power offer incentives or rebates information?
Yes. Fortress Power provides a Rebates & Incentives resource on their website to help customers identify available federal, state, and utility programs that can offset the cost of installation.
What is the EnergyBroker program?
EnergyBroker is Fortress Power's Virtual Power Plant (VPP) program that allows homeowners to monetize their stored energy by participating in grid services, helping offset energy costs further.
