The tax exemption pursuant to § 3 No. 72 EStG applies to income from the operation of certain photovoltaic systems on, at or in other buildings (with several residential and/or commercial units) with an installed gross capacity of up to 15 kW (peak) per residential or commercial unit. [pdf]
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When your solar panels shut down, they stop generating electricity. This is unfortunate for your energy bill. Instead of using the electricity you've generated, you'll have to rely on power from the grid again, which costs more. [pdf]
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Key technologies include metal-air, redox flow, molten salt batteries on the electrochemical side, as well as mechanical systems like pumped hydro, compressed air, liquid air, and gravity-based energy storage. [pdf]
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