Billionaire software developer and philanthropist Mike Cannon-Brookes has set aside $12 million to install as many as 100 stand-alone solar and battery units in 100 days to provide off-grid power to hard-hit bushfire communities.

The Resilient Energy Collective - established only three weeks ago in the family office of Mike and Annie Cannon-Brookes - has already installed two units near Cobargo in southern NSW and one at Goongerah in Victoria's East Gippsland.

Billionaire software developer and philanthropist Mike Cannon-Brookes. Credit:Renee Nowytarger

The systems will range from supplying 8 kilowatt-hours to as many as 400 kW-hours per day, and allow homes, businesses and some infrastructure to operate around the clock.

The unit at Peak Alone near Cobargo was operational in less than 48 hours. It powers a police radio tower and a separate one used by the Rural Fire Service, the National Parks and Wildlife Service and Eurobodalla Shire radio.