Alternative energy or renewable energy is converting available ambient elements such as sun, wind and water into an energy form that we can use. Once converted, the power would be available as DC, to power energy efficient systems or AC as a backup to conventional power supply. Depending on the need, this may be a low level of converstion which caters to lighting or backup power. Where there is greater need or dependance on alternative sources of energy, the systen may replace access to a national power grid.

An alternative energy system is created when the three elements described below are combined. The solar panel converts sunlight into electrical energy, the solar controller harnesses that energy and controls its use with the battery storing the energy for use.