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The Kostal BA storage system is actually one of the first real high-voltage systems on the market. Even before the current segment of lithium-ion high-voltage storage, Kostal built a DC coupled system with lead-gel batteries. Even before Tesla, it became a lithium-ion high-voltage solution with Sony. It is without doubt a proven and reliable system. The 3-phase feed in devices come available with 6.0, 8.0 and 10 kW with all necessary communication interfaces on board. The new BYD B-Box high-voltage storage unit turns it into a modern power package.