3500w power inverter

At that price, the inverter is almost certainly a modified sine wave inverter. Be aware that it will work fine for many things, acceptably well but not ideally for other things (i.e. they may be noisy or run hotter and less efficiently than otherwise), but is incompatible with some other things--some of which may actually be damaged when powered by it, over time if not immediately. Among the things that won't work or may be damaged are most dimmer switches, variable-speed power tools, many electric blankets, and apparently some Apple (and maybe other brand) phone chargers/laptop power bricks.