rbpru wrote:
If I recall properly, a three prong 30 amp plug has a hot blade, a neutral blade and a ground pin. It runs on 120 volts.
So, you have 3600 watts available from the shore plug. Your heater will use up a little less than half.
The idea of using a separate line to the camp ground’s 20 amp outlet is clever as it is a separate line; giving you a total of 50 amp like some of the larger trailers.
However,since the 50 amp plugs can provide 240 volts or two 120 volts, circuits with a common neutral, one must be aware that it may be possible to have one appliance plugged into one side of the 240 line and another plugged into the other side of the 240 line; depending on how the electrical box is wired. This could be an issue if the neutral line opens.
Umm.. the "50A" RV connection actually gives you 100A since it uses both Line1 and Line2 and each "line" is capable of 50A each..
So, a "50A" RV connection has the capability of 12,000W.
Using 30A (3600W) shore cord and one 20A (2400W) extension cord is only 6,000W.
While a electric heater will only use half of the 30A connection you do have other items in the RV which will draw a good bit of wattage. The fridge run on electric will use 275W-325W, the converter will draw some power just to name a few..
The someone decides to plug in a hair drier or use MrCoffee, microwave or any other high draw item and it is all over..
It can be done but you need to be aware of what is running and turn off items in order to share the power..