Originally Posted by skylilymd
At least on my Forrester it seems to be the hot water heater electric elements that draw more than I would think they do. if we try and run the AC and the electric hot water heater you can't use microwave or it will trip the breaker - I have found that if we just use the hot water heater on propane the breaker never trips so I am not entirely sure if the hot water heater electric elements just draw a lot of power or what. Maybe that is why they have the electric hot water heater switch outside behind the door - that way they could advertise it as a feature but didn't have to worry about people actually using it because it would overload the system lol
The Suburban water heater has a 1440 watt electric heating element, which is 12 amps....per the FAQ located here:
Amps = watts/voltage
12 amps= 1440 watts/120 volts
Suburban's electric switch and much more
Around the 2002 model year and later, the Suburban water heater came stock with a 1440 watt electric heating element. What this means is it will take 12 amps to power it with 120 volts, when the element is on and heating the water. You may need to keep this in mind when hooked up to 30 amp power supplies, as it may cause breaker(s) to trip if you exceed the maximum amount of amps on a circuit. You may need to turn the electric heating element off... if using other high amp 120 volt appliances at the same time, like microwave, air-conditioning, coffee pots, hair-dryer, etc.....as you would only have 18 amps available to power these other things. (30 amps total minus 12 amps for the heating element = 18 amps available)
In other words 40% of your available power is going to the electric heating element when using 30 amp RV's/power supplies.