Aquion Energy has agreed to supply a 1 megawatt-hour (MWh) battery system as part of an off-grid solar microgrid at Bakken Hale on the Island of Hawaii.

The battery system will store on-site solar electricity and will allow the Bakken Hale residential estate to operate entirely free from utility grids.

Renewable Energy Services (RES) is designing and installing the off-grid microgrid system, which utilizes uses a 176kW solar array, a 1MWh Aquion AHI battery system.

A propane-fueled generator will offer emergency backup power. Aquion said its batteries will charge on an eight-hour cycle during daylight hours, with a 16-hour discharge cycle.

Aquion Energy chief executive officer Scott Pearson said: "The Bakken Hale project is the first of several very large microgrid projects we plan to supply using our M-Line Battery Modules.

"We look forward to working with RES to install this system and showcase our capabilities to the Hawaiian market."

Aquion Energy manufactures Aqueous Hybrid Ion batteries and battery systems for long duration stationary energy storage applications.

The existing manufacturing line of Aquion has the capacity to generate over 200 MWh of energy storage capacity annually.

Aquion’s 350,000ft² production facility located near Pittsburgh, Pennsylvania, will generate energy storage capacity of about 1,000 MWh a year.