* Inverter-battery kit boosts use of self-generated power * Most solar panels use only 25 pct of power produced * High German power prices drive urge to save energy * SMA hopes battery will compensate low inverter margins By Christoph Steitz MUNICH, Germany, June 21 (Reuters) - SMA Solar, Germany's largest solar company, is launching an battery set that will allow households to store surplus daytime solar energy for use in the evening, cutting energy bills. German households pay some of the highest prices in Europe for electricity...
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