Here all the loads are run on AC using an inverter to convert power stored in the battery bank to 230Vac. This simplifies wiring since low cost, readily available cable, switches, outlets and fittings can be used. Good wind/solar resources are important in order for the energy demand to be satisfied even when weather conditions are poor and the renewables must be sized so they are able to put sufficient power into the batteries to maintain demand at all times. The inverter must be sized to meet the maximum electrical load that is needed ie. to run all appliances that might be on at the same time. Usually fuels other than electricity are used for heating & cooking.