AccESS™ with AmpliPHI™ Batteries and Sol-Ark Inverter

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AccESS™ with AmpliPHI™ 3.8kWh batteries and Sol-Ark Inverter is a fully integrated and pre-programmed energy storage and management solution with closed-loop communications that self-monitors, keeps the lights on and lowers utility bills, creating peace of mind for homeowners and businesses. AccESS maximizes PV generation by storing excess power for critical backup, evening hours and daily self-consumption to offset Time-Of-Use rates. Net-metered customers can add energy storage to existing grid-tied solar systems for standby power or energy arbitrage. Off-grid customers can take advantage of integrated MPPT charge controls to create stand-alone systems for whole-home power and generator optimization with auto start capabilities.


Stringent Safety-Tested System

Certified to UL 9540 and safety tested to UL 9540A.

Fully integrated Energy Storage Solution

Utilizing PHI or AmpliPHI batteries.

Lithium Ferro Phosphate (LFP) Chemistry

Safer, efficient and reliable access to power - 24/7.

Scalable for Any Energy Need

Easily scales to increase energy capacity with the BOSS.6 or BOSS.12 cabinets.


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Model Number
Maximum Rated Unit kWh Capacity @ C/2
22.8 kWh, up to 164.2 kWh with additional BOSS cabinets
Usable kWh Capacity @ 80% DoD
18.2 kWh, up to 131.4 kWh with additional BOSS cabinets
Max Combined Output Power
6 kW
Max Combined Charge Current
100 A
Charging Temperature
32°F to 120°F (0°C to 49°C)
AC to AC Round Trip Efficiency
Cycle Life
10,000+ cycles (@ 80% DoD)
Battery Warranty Period
10 years
29.5” W x 76”H (w/feet) x 20” D / 75 cm W x 193 cm H x 51 cm D
600 lbs. (270 kg.) w/o batteries
Enclosure Rating
NEMA 3R Outdoor Rated
Operating Temperature1
-13 – 140 °F (-25 – 60 °C)
Free-standing or Pad-mounted
Enclosure Warranty Period
2 years
Sol-Ark 12K
Inverter AC Connections
1 Bi-Directional Grid Port (63A double-pole), 1 UPS Load Output (50A double-pole), 1 Generator Port (63A double-pole); can be used for Smart Loads output
Solar PV Continuous Power
12 kW
Inverter AC Continuous Power
9 kW
UL1741SA Rule 21, HECO Rule 14H, PREPA approved and Rapid Shutdown compliant UL 9540, included batteries ETL certified and certified to UL 1973
Depth of Discharge3
Up to 100% DoD

1 Max operating conditions. Refer to Installation Manual for recommended conditions.
All specifications listed are typical/nominal and subject to change without notice.
UN 3480, Lithium Ion battery contained in equipment, 9, II
UL, CE, UN/DOT and RoHS compliant components – UL Certified
Engineered and Manufactured in California, USA