German solar battery maker sonnen expands capacity as power subsidies endFRANKFURT: German residential solar battery maker sonnen is extending capacity at its home base in Wildpoldsried with demand for home storage systems expected to grow as subsidy programmes for supplying renewable power to the grid end.

There are 1.8 million photovoltaic plants in Germany, the bulk being small rooftop solar units. Homeowners have benefited from a rolling 20-year programme of generous feed-in tariffs for selling renewable energy to the grid.

But with these being phased out, the systems must become self-financing and it could be more economical for homeowners to use batteries to store the power they produce for later domestic use.