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Back to Electric Stuff Page The 30 amp main breaker box. As shipped from the factory our rig was 30 amp 120 volt. It included a Power Management System and we could, as set up, run both roof air conditioners with the 30 amp. The Power Management System monitors power usage and turns off things as needed, such as the Fridge. When the fridge goes off electric, it goes to gas. Note: 1. Is the lower bus of 2 busses on the main breaker box. 2. Is the upper of the 2 buses. In our case the breaker box, and breakers are horizontal. 3. Is the jumper wire from the lower, charged, bus to the upper. 4. Is the Power Management System. Also please note that each breaker is a space saver type, meaning that the breaker taps one of the buss connections but has 2 breaker/connections. The first one in line is a 20/30, the 20 being the front AC and the 30 is the main. How Does This Stuff Work? When plugged into shore power you have 120 volts at 30 amps. Multiply volts times amps and you get watts. So, when plugged into shore power we have 3600 watts available. If you relate this to a house with 200 amp service, the house has 48,000 watts available. Big difference. Take a look at almost any appliance and you will see the amps and volts listing on a plate on the bottom. For example, a small electric fry pan (ours anyway) is 2.3 amps at 120 volts. This means that it use 2.3 x 120 = 276 watts. A toaster as high as 1,000 watts. Electric heater up to 1,500 watts. So you can see it really won't take long to eat up 3,600 watts. Our rig is equipped with a Onan Emerald Plus 6500 generator. In it's original configuration it had 2 breakers on the GenSet. 1 30 amp and 1 20 amp. When the generator was running the 30 amp breaker on the GenSet charged the main breaker box and the 20 amp ran the rear AC. So, on generator, we now have 50 amps of 120 volt power available. We can now use more "stuff" because the rear AC is not pulling its load from the main breaker box. So, in this case we can kinda say we have 50 amp service in a 30 amp rig. Clear so far. ;-) NEXT