Western Australia is continuing to see a surge towards home solar energy, with the Tesla Powerwall attracting a cult-like following and new data showing Mandurah residents installed more solar panels and capacity than any other postcode in the nation last year.

Tesla's much-hyped Powerwall home battery went on sale in December, with Australians among the first to be able to order the wall-mounted unit.

Infinite Energy residential sales manager Rohan McGlew said hundreds of people had approached the company since it began selling the solar power battery system last week.

"I have been in solar for over 10 years and this is the first product people have taken photos with," Mr McGlew said.

Mr McGlew likened the Powerwall's popularity to an iPad, where slick design and marketing had captured consumer attention, even though similar products had been available for some time.

Tesla, which has long sold solar battery storage systems made by other companies, is offering a basic package - including a three kilowatt solar PV and rechargeable lithium battery - for around $15,000, including government incentives.

"It would allow them [homeowners] to run the house during the day and during the night as well, if they're a lower power user," Mr McGlew said.

Although people were flocking to see the product, Mr McGlew expected only about 20 customers would actually place orders, because it was still too expensive for the average consumer.

SunWiz consultancy solar analyst Warwick Johnston said while it was mostly early adopters who were investing in solar battery technology, he expected it to become attractive to the mass market as prices came down in the next three years.

"It's a bit early now. The costs are high and the payback is too long," he said.

WA bucks trend on rooftop solar, data suggests

According to SunWiz analysis of new Clean Energy Regulator data, rooftop solar continued to grow in popularity in WA last year while contracting in every other state bar New South Wales.

There are more solar panels in Mandurah, Wanneroo and Canning Vale than anywhere else in WA. ( ABC News )

The charge towards solar in 2015 was led by Mandurah, around 70 kilometres south of Perth, where residents added 814 solar PV systems with a total 3502kW capacity.

The data also showed more than one in four dwellings in Mandurah's 6210 postcode had rooftop solar, a figure which fell short of Canning Vale's 34 per cent take-up.

However Mandurah remained WA's number one solar postcode in terms of total installations, with 8,351 systems with a total capacity of 20,482kW.

Wanneroo (6,041 installations with 17,715 kW capacity) and Canning Vale (5,478 with 14,922 kW) were next best.

According to the SunWiz analysis, WA is the fourth biggest solar market in the country, with Queensland still the leader despite a 23 per cent contraction last year.

The burgeoning popularity of rooftop solar is also increasingly reducing peak demand on the electricity network servicing Perth, according to the Australian Energy Market Operator.

Its data shows peak demand on the hottest day in Perth five years ago was 3735 megawatts, reduced by 19MW due to solar PV systems.

In 2013, solar PV reduced peak demand by 84MW on the hottest day of the year, and in 2015 the figure more than doubled to 187MW.

That does not take into account how the impact of solar PV is affected by other factors, including the time of peak demand.