Fortress Energy Storage


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.

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 Generator
Applications 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 100% 100% 50% N/A
Battery Chemistry Safest technology Potential thermal runway Risk of harmful gases Environmental pollution
Life Cycles Up to 6,000 3,000 500-1,000 N/A
Warranty 10 years* 10 years* 6 moths 2 years
Fuel Cost $0 $0 0 $.50 per kWh
Maintenance No No Every 6 months Yes

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

Technical Specifications
Darfon Inverter AC Output 5kW
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
Certificate UL recognized component*

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

Fortress Install
Interested In

Becoming A Certified Installer?

Join us to bring the latest energy storages to millions of homes and businesses across the world. 

HOw to

Become A Dealer

Gaining a competitive advantage for your business is simple.


Request Information

Submit an authorized installer form.


Talk To Our Team

Obtain your installer package and start-up kit.


Get Certified

Become a trained partner with on-demand support and co-marketing.

$ 0
Annual Energy Savings
Energy Generated Annually
0 +
Installed Units
0 +
Achieved Grid Independence
Fortress Power

Maximize Your Savings

Our integrated battery backup power solutions have helped homeowners save over $6 million dollars in energy costs.


A Quote Today!