This 3000 watt inverter charger produces a pure sine wave, which some appliances require for use. So it can run laser jet printers, computers, televisions, CPAP machines and other medical equipment. In the event of a power outage, this inverter combined with a battery bank can be used to power a few lights, a refrigerator and perhaps a few other necessities. Popular applications for this inverter include: off-grid home or business back up power, providing electricity for a mobile business or mobile office, and running camping equipment