Batteries are used to store energy, just like a fuel tank in a car. Just like a fuel tank, they do not produce energy. The energy taken out needs to be replaced or the battery will eventually run out of power.

The most popular types for solar and wind applications are deep cycle lead acid batteries. From the cost and reliability perspective, this established technology continues to dominate. Lead acid batteries have to be treated with care or they will need replacing very quickly.

The care they require is quite simple - they must not be over-charged or over-discharged. In a solar or wind energy system, the charge controller takes care of the batteries, ensuring that they give an optimal life. For gel or AGM batteries, little or no user maintenance is required. Wet unsealed batteries need occasional topping up with distilled water.

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