The Fortress Battery | Battery Backup & Solar Energy Storage

Fortress Battery

The Fortress Power Advantage

Fortress batteries can be paired with most chargers and hybrid inverters available on the market.


Fortress Power batteries are made from advanced lithium ferrite phosphate technology, which means they produce significantly higher energy discharges than standard energy storage solutions – giving you the power you want, when you need it most.


It’s a fact: Lead acid batteries may release dangerous gases that put you and your loved ones at risk – but lithium ferrite phosphate technology is scientifically proven to be safer. At Fortress, we aim to keep your home and business safe; it’s our ultimate priority.

6X Longer Life Span

Long lasting life span equals valuable financial investment. Fortress Power’s batteries operate for up-to 6000 cycles. That’s up to 10 years of high-quality, reliable service. Conventional lead batteries? They only last through 500 full cycles. The choice is easy.

No Maintenance

We mean it: Fortress Power batteries require little to no maintenance, so you can install your battery and never have to worry. Traditional lead batteries require service every 3-6 months, but our professional team is here to do the work for you and answer questions.

Compact & Lightweight

We proudly design batteries that are 1/3 the size of conventional lead-acid batteries – so, you can store your energy without compromising your home or business’ aesthetics. And our batteries come on wheels, which makes installation a piece of cake.

Deep Depth of Discharge

Fortress Power’s batteries are cleverly designed to be fully dischargeable – preserving (and possibly extending) their lifespan. Their depth of discharge is preset at 80%, creating 20% more usable energy than lead-acid batteries. So? More energy, less money.

Easy to Install

Installed by our specialists in only one hour, we can get your battery up and running immediately

High Performance

Batteries have ​​a large power capacity and high continuous discharge power and can be recharged quickly, efficient round-trip conversions.

Consistent Reliability

The advanced Lithium Ferro Phosphate (LFP) technology operates a wider temperature range to provide the most dependable performance.

Superior Safety

Your family’s safety is our number one priority, that’s why we use the safest lithium technology and apply the highest manufacturing standards.

LFP-10 System

Fortress Battery Specs


 Total Energy (kWh)
 Max. Charge Current (Continuous) [A]
 Max. Discharge Current (Continuous) [A]
 Max. Pulse Current (for 10 sec) [A]
 Capacity [Ah]
 Voltage [V]
 Charging Temperature [F]
32 to 113
32 to 113
 Discharging Temperature [F]
-4 to 140
-4 to 140
 Storage Temperature [F]
-4 to 131
-4 to 131
 Dimension [H xW x D, inch]
33 x 16.4 x 9.4
33 x 16.6 x 13.4
 Weight [lbs]
Life Cycles
Fortress Power v2 Battery
          Fortress eVault LFP-15 Lithium Battery





User Friendly

Fortress Power’s Engineers are on a mission to provide you with the most advanced Lithium Iron Phosphate Battery available!  Not only is the new Fortress eVault LFP-15 kWh battery safe, long-lasting and affordable, but is also equipped with a brand new LCD screen that displays voltage, state of charge, remaining capacity and power output.

The built-in Battery Management System integrates multilevel safety concepts for excellent performance:

Overcharge and Deep Discharge Protection

Voltage and Temperature Monitoring

Over-Heat Protection

Cell Monitoring and Balancing

Those safety features are demonstrated on the LCD display.  Plus, out technology is capable of connecting 8 units in parallel to achieve 120 kWh!
Battery in Garage


  • Battery backup – A simple, robust option for using clean energy to keep a building powered during power outage.
  • Self-supply – Obtain energy independence by storing excess solar energy for later use
  • Time-of-Use – Store off-peak grid power for use when utilities charge the highest rates.
  • Demand charge curtailment – Reduce the demand charge for businesses
  • Off-grid – Use renewable energy to power your home during the day light, and stored excess energy for the night.

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