Fortress Energy Storage

Fortress Energy Storage

Have you been surprised when your solar system stops working when the grid goes down?

With Fortress Power smart energy storage, you can continue to use your solar power – even during grid outages. Our mission is to provide compact, user-friendly, and affordable energy storage solutions using the latest technology for all homes and businesses. Fortress smart energy storage units can be easily integrated with new and existing PV systems. It simply works by storing clean energy and providing power when you need it.

Fortress Energy Storage

Adding Fortress Power Energy Storage to your solar PV systems enables you to maximize the use of your clean solar energy by storing excess solar for use at night.

  • Provide power during grid outages
  • Lower your electrical bill by avoiding having to buy electricity at peak times
  • Enjoy a 30% investment tax credit when incorporating with solar
  • Increase your independence from the utility grid

Why Fortress Power Is Better Than Alternative Power Back-Up Solutions

Fortress Power Solution
Other Lithium Ion Solutions
Lead Acid
Backup power, time of use, self-consumption & off grid
Backup power, time of use, self-consumption & off grid
Backup power
Backup power
Depth Of Discharge
Battery Chemistry
Safest technology
Potential thermal runway
Risk of harmful gases
Environmental pollution
Life Cycles
Up to 6,000
10 years*
10 Years
6 months
2 years
Fuel Cost
$.50 per kWh
Every 6 months

*10-year warranty for Fortress Power Battery; 5-year warranty for Darfon inverter

Technical Specifications

Darfon Inverter AC Output
Surge Power At Backup
5.5/6.5/7.5 kW  (40/5/1 second)
Transfer Switch
48 amps auto-transfer relay
AC Grid Voltage
120/240 volts
AC Output
21 amps
Battery Input Voltage
40-58.4 volts
Battery Life Cycles
Up to 6,000
Battery Capacity
10, 15, 20 or 30 kWh
UL recognized component*

*Inverter: UL 1741, IEEE 1547, FCC Class B; Battery cell: UL 1642, UN/DOT, ROHS

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