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Telecommunication facilities of all types from small cellular radio sites to microwave repeaters and larger Point-of-Presence (POP) and switching hubs, all require uninterruptible power supply (UPS) to ride through short duration interruptions. This function is supplemented by back up diesel generators for support in the event of long term outages. Conventionally, the UPS functionality has been provided through the use of lead acid batteries. In many off grid or weak grid installations, diesel generation is often the only source of power, sometimes supplemented by photovoltaic power or even wind turbines.