In a typical RV with an electric service of 30 amps, some of the electric and portable appliances are air conditioning, electric heaters, microwaves, coffee machine, electric stove, hair dryer, heater and toaster.

How many Watts can a 20 Amp circuit breaker be handled? For the standard 120 V service, a 20 Amp circuit breaker can withstand up to 2400 watts on a single circuit. However, circuits must not be charged to more than 80% of their maximum capacity for long periods of time, making 1,920 watts the safe maximum for a 20 Amp circuit.

The 15 amp and 20 amp switches usually deal with basic heaters, 30 amp heaters and electric dryers, 40 amps and 50 amps are for the electric range, and 70 amps can serve a large air conditioner or sub-panel.

In general, to count the devices on a circuit that counts each output (light or container) as 1.5 ampere. Remember now that it counts only 80 of the rating, which means that a circuit breaker of 15 amperes should not exceed 12 amperes of charge, a circuit breaker of 20 amperes would be 16 amperes.

A power of 30 amps provides 3,600 watts (30 amps multiplied by 120 volts). Therefore, the breaker of this output could respond to the code and continue to run between a total load of 2,880 watts (80% of 3,600 watts) and 4,320 watts (120% of 3,600 watts).