Q. What is a good size inverter for a car?

Answer

Choose an inverter with wattage of 450 or less if needing it to fit in the car's cigarette lighter. Inverters with a higher power output (500 W or more) require a direct connection to a battery. The Owner's Manual will include information on the appropriate cable size based on the set up's battery and inverter locations. Intense use can drain a battery. To that purpose, we advise employing a 300W power inverter in standard automobiles. Use this calculator to obtain a rough idea of how long battery and device will last together. If the result of the calculator is zero, then the battery bank does not have enough ampere-hours to power the load.