Let’s start with this model from Bestek, which has a very low price tag. Despite that low price, there are a number of very useful features on this device.
The fact that it comes with not one but two AC outlets is great and should stop at least some of the arguments over whose cell phone gets charged first. It also has a pair of USB ports that can power devices, and you can charge up to four devices at a time. However, with a total output of only 300 watts, it will struggle to charge that many. But it will happily charge a couple of devices at a time with very little strain.
The built-in cooling fan is constantly in operation, which can make it a little noisy, but all in all this is a very well-designed inverter with a very reasonable price tag.