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Heavy-duty deep cycle trolling & house power battery (on right) and Xantrex DC to AC inverter (left)

The battery is 12 volts and 105 amp hours. It is much better for a photovoltaic system than a car battery, because it can handle discharging to about 20% of it's capacity. A car battery is not meant to discharge much. The battery needs to be kept in a well vented area, because it emits explosive hydrogen gas when it is charging. The DC to AC inverter takes direct current from the battery, and changes it into alternate current. That energy can then be used by various household appliances, like a computer and a TV.