NIMTEK MM4000 Pure Sine Wave Off-grid Inverter, Solar Inverter 4000 Watt 24 Volt DC To 220 Volt AC Converts 24V DC to 220V AC of pure sine wave power. Ideal for running small electronic tools, air pumps, electronic doors, small motors, refrigerators, HDTVs, electronic game systems, computers, laptops and inkjet laser printers. Strong adaptability and stability ; Temperature-controlled fan, safe & efficient; With automatic over-current and output short circuit protection to avoid damaging the equipment; High transform efficiency, fast start; Safe and reliable with built-in fuse. Pure sine wave output waveform; Softstart function.