Solar PV systems can make electricity on your roof, but not necessarily when you want it. The mismatch can be fixed by selling any surplus via the grid, and taking power back when you need it. This isn't great for homeowners weighing up an investment in solar panels. Feed-in tariffs can change, and future energy bills are hard to estimate. One answer is to store electricity on site, an option that has been open to German enthusiasts for domestic PV for a while. Now it is coming to market in the UK, with the first system tailored to the single phase electricity supply used in this country.
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