They can just about pay for themselves depending on what you use them for.
Ever attempt to connect the power inverters manufacture to your electrical system with a simple jumper cord using a male connector at each end.
The chance of shock or shorting the power inverter is too great. And you will damage the inverter.

Some inverters will cause radio/TV interference.
Some will cause interference only on certain brands or models within brands.
Good dealers will allow you to bring your vehicle to their place of business so inverters can be temporarily connected to test interference problems.
Buying a 1000W car power inverter from a company that will let you return it for full or partial credit if it’s in like new condition, original box, etc.

A power inverter is basically a device that draws in current from a DC (direct current) source, often a battery for most household models, and covert it to AC (alternating current) for use in electrical appliances.
One good example is the common 12-volt cigarette lighter socket found in your car.

So, in order to make the most out of your pure sine wave car power inverters, you need to choose one that will suit your needs.
Here are some tips that will help you in purchasing your inverter.