ForewordIn recent years, outdoor power (also known as energy storage or mobile) has flourished. In general, off-site power, using solar or market power, fills up the batteries and releases them when they are needed to provide continuous power for the equipment. Accumulation batteries typically use a 24v/48v homeline programme, which requires 220v ac for electrical equipment, and therefore requires the conversion of 24v dc to 220v ac for dc-ac pow