Battery storage will become "the norm" for Australian households in as few as three years because of the savings to be made from combining it with rooftop solar panels, the head of California-based technology company Enphase Energy says.

Paul Nahi, chief executive of Enphase, said just as it made no sense to build a house with no insulation, the same would apply in just a few years for electricity storage in Australia, which he regards as the leading market for take-up of the technology worldwide.

Fiona O'Hehir says the $1 million is an investment in the future of the solar industry. Credit:Glenn Hunt

On a visit to Sydney for the launch of Nasdaq-listed Enphase's "home energy solution" system that combines solar generation, energy control and battery storage, Mr Nahi said he expected the introduction of battery storage to transform the entire power grid and bring it into the 21st century.