Fortress Energy Storage (Inverter + Battery)

Fortress 8kW/18.5kWh Energy Storage Solution

Innovative, affordable and easy-to-install energy storage solution (ESS) that can used for both new and existing PV arrays.

World's Most Efficient

93% round-trip efficiency rate (PV-> battery-> AC load), 8- 20% higher than the competitors’

Powerful

9 KW continuous for On Grid production & 20kW peak Off Grid for starting 3 ton A/C or well pumps; 18.5 KWH storage capacity per unit and is scalable to 148kWH

Flexible

It can be DC coupled to new array, as well as AC coupled to existing array. DC + AC Coupling Combined supports up-to 13KW PV array

Simple to Install and Use

The plug and play solution integrate charger, inverter, auto-transfer, distribution box, monitoring all in one unit

Highest Safety

Safe lithium iron phosphate chemistry; no cooling and ventilation is required

Applications

ALL-IN-ONE SOLUTION (GRID-TIED, HYBRID OR OFF-GRID)
Simultaneously manages power to/from Solar, Battery, Grid, Load, and Generator

  • Grid Tied Mode: Sell your power to reduce your electric bill
  • Meter Zero Mode: Zero your electric bill without a smart meter
  • Time of Use: Use solar and batteries to minimize grid power usage when its most expensive
  • Smart Load: Use a programmable output for high power off-grid items or Grid time of use items to run only when there is a lot of Solar (hot water, A/C, pumps, dehumidifier)
  • Peak Shaving: Reduces your peak power demand from the grid

Comparison Chart

Please click below to download comparison chart to find out how Fortress Power Energy Storage System compares with other solutions available on the market.

Fortress Power ESS uses the innovative Sol-Ark inverter, which is designed and engineered in Texas.

Fortress Sol-Ark 8kW Inverter

Battery Solar Made Affordable

Specifications

Solar
 
Max allowed PV Power
11,000W
Max allowed PV Power per MPPT
6,000W
Max DC Voltage
500V
MPPT Voltage Range
150-425V
Starting Voltage
175V
Number of MPPT
2
Solar Strings per MPPT
2
Max DC Current per MPPT
18A (self limiting)
Max AC Coupled Input (Micro/String Inverters)
7,000W
Max Combined Solar Input (DC+AC)
13,000W

AC Output
 
Connections
120/240V split phase or 120/208 V
Continuous AC power on Solar or Battery
9,000W 37.5A L-L (240V)
4,800W 40A L-N (120V)
Surge AC power 5sec
20,000VA L-L (240V)
10,000VA L-N (120V)
Frequency
60/50Hz
Continuous AC power with Grid or Generator
12,000W 50A L-L (240V)
6,000W 50A L-N (120V)
CEC Efficiency
96.5% (Peak 97.5%)
Response Time (Grid-Tied to Off-Grid)
4ms

General
 
Dimensions (H x W x D)
28.0" x 17.375" x 9.37"
Weight
75 lbs.
Enclosure
NEMA type 1 (Indoor Use)
Ambient Temperature (4 variable speed fans)
-22 to 55°C, >45°C derating
Display
Color touch screen
Wi-Fi Communication (monitoring or SW updates)
Integrated
Snap on sensors for limited selling to household
Included
Standard Warranty
5 Years
Optional Extended Warranty
10 Years

Protection & Certifications
 
Grid Sell Back - UL1741-2010/2018, IEEE1547a-2003/2014, FCC 15 class B, (April 2019: UL1741SA, CA Rule 21, HECO Rule 14H)
Yes

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