FRANKFURT, April 21 Reuters Solar battery maker sonnen said on Thursday that it will offer retail buyers of new rooftop photovoltaic systems in Germany an inexpensive power supply from the third quarter of 2022.

Berlin has passed renewable power legislation to speed up the country39;s transition to lowcarbon fuels and eliminate its dependency on Russian oil and gas after Moscow39;s invasion of Ukraine, which the Kremlin calls a special military operation.

Shellowned sonnen said that it will draw on the increasing competitiveness of homeproduced electricity from solar panels and further sales of its storage batteries.

Germany, with a population of 84 million, has some 500,000 household power batteries which are provided by sonnen and competitors such as Senec and China39;s BYD.

Independent research this month indicated that unit sales this year may jump by 67 over 2021. 

Householders39; power costs can be brought down to zero or maybe even attract a payout for excess volumes at the end of the year, Bavariabased sonnen said in a statement.

Sonnen introduced a digital community for buyers of its batteries in 2015, which complement solar photovoltaic PV generation by capturing excess power for use later. This community shares jointly produced production volumes.

Before batteries became available, homeproduced power went straight to the grid for a stateguaranteed feedin fee.

This type of payment has become less lucrative as PV systems become more efficient, while…