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Electricity storage devices (Buffer Storage). For some time now nickel-cadmium (NiCd) batteries have been used in solar technology. However, more and more environmentally-friendly batteries such as NiMH (nickel metal hydride) and NiH (nickel hydride) are becoming available. Most batteries used in conjunction with PV systems have a voltage of 1.2 V, but automobile batteries with voltages of 12 V are also used.

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