Reliable Power When You Need It Most.

Fortress Power's mission is to provide compact, user-friendly and affordable lithium energy storage solutions using the latest technology for all homes and businesses. Fortress Power’s innovative energy storage units can be easily integrated with new and existing PV systems. They work by storing clean energy for when you need it most – it’s that simple.

Why Choose Fortress Power?

Fortress Power products use the latest cell technology that provides higher efficiency and a longer life span than other systems. The chart below compares the Fortress Power Lithium Iron Phosphate solution to other systems on the market.

Features Fortress Power Solution Other Li-ion Solutions Lead Acid Generator
Applications Backup Power, time of use, self-consumption, off-grid Backup Power, time of use, self-consumption, off-grid Backup Power Backup Power
Discharge % 100% 100% 50% N/A
Battery Chemistry Safe Technology Potential thermal runway or firing Risk of harmful gasses Environmental Pollution
Life Cycles 6,000+ (15+ years) 3,000 500-1,000 N/A
Warranty 10 years 10 years 6 months 2 years
Fuel cost $0 $0 $0 $70-$130 per day
Maintenance No No Every 6 months Yes
Cost ($/kWh) 0.14 0.30 0.65 0.50

Products 1-3 of 3
Fortress eFlex 5.4KWh
Price: $3,910.00
Availability: Special Order
Fortress Item #: BDF80055 -

The Fortress Power eFlex is a 5.4 kWh scalable energy storage solution based on safe and energy dense prismatic Lithium Iron Phosphate cells. The digital processor Battery Management System (BMS) includes high amperage contactor disconnects and advanced closed loop inverter communication, as well as individual cell voltage monitoring, temperature monitoring, and cell balancing to maximize reliability and longevity. Canbus, modbus, and wifi communication enable internet-of-things ...

Fortress eVault Max 18.5KWh
Price: $11,785.00
Availability: Special Order
Fortress Item #: BDF80185 -

Fortress Power proudly services homes, businesses, utilities, telecom and transportation companies worldwide. Our Pennsylvania-based team’s passion for clean energy storage has earned us a place among the world’s top energy storage battery manufacturers. DATA SHEET

Fortress FlexRack
Price: $1,840.00
Availability: Special Order
Fortress Item #: BDF80190 -

Expand your energy storage with the new Fortress Power FlexRack! This iron enclosure stores up to 4 eFlex 5.4kWh batteries. The FlexRack paired with multiple eFlex batteries can build a 48V UPS server rack or provide storage capacity to home solar arrays. The FlexRack includes intergrated busbars, wheels, and a DIN rail heater mount. This enclosure can be free-standing or pad mounted.DATA SHEET