An inverter is essentially a device that changes direct current (DC), which is current drawn from a battery to alternating current (AC) that is similar to the current that is drawn from the utility. Some inverters have built-in battery chargers and are plugged into the utility. Other inverters have solar panel (PV) inputs, whereby the batteries of the inverter are charged by solar power. There are also hybrid inverters that do both the above. Alpha Power supplies inverters that cater for all the above battery charging variations.