Commercial scale batteries store energy from solar arrays or the grid during low demand periods. Power is consumed when needed at lower cost to take advantage of variable TOU (time of use) rates. Power can be sold on demand to a utility for peak shaving allowing reduced investment in generation capacity to meet peaks with behind the meter storage. Standby emergency power is available to keep critical loads operational especially for areas experiencing frequent outages. View live status, receive equipment alarms, change settings and perform manual control from an NRGpilot™ portal using a browser.