Determine how many wattage you need AND find out what kind of car you have
The figure below gives you an estimated figure of how many wattage you may need. Different models
may vary, please make sure you read the nameplates or power tags before choosing a power inverter.
Be careful when some appliances and tools may require from 3 to 7 times the running
wattage when starting, such as refrigerator and air conditioner.
Most cars run 12 volt power system,then you
should choose a 12 volt power inverter if you
are going to use with a cigarette lighter or a
car battery. Otherwise, choose a 24 volt inverter.
Determine what kind
of AC you need
Basically, there are two kinds of AC, modified sine wave and pure sine wave.
If you are using some delicate medical equipment like oxygen concentrator and nebulizer, etc. be sure that you are using pure-sine-wave output power inverter.
Otherwise, modified sine wave make not much different.