Originally Posted by rkymtn57
Thank you all very much , I think she overloading the circuit , trying to run a free standing floor heater . She reset all breakers and elect. came back on.
We'll see what else happens , she can also run a extension cord fron the outside pole in to the RV to run the little heater. D
She is trying to run an electric heater, with a hair dryer?
As explained, she is limited to 30 amps total.
Another way to look at this is
watts = voltage x amps
3600 watts = 120 volts X 30 amps
She cannot run over 3600 watts of things or 30 amps.
a 1500 watt hair dryer and a 1500 watt electric heater are 25 amps together. 1500 watts divided by 120 volts = 12.5 amps
She may even have a 1850 watt hair dryer which draws even more amps.
Her electric water heater element is 1440 watts or 12 amps....when it is on and heating the water.
This isn't counting anything else on 120 volts (microwave, air-conditioner, fridge on electric since you said she has no propane which is 5-8 amps, television, anything plugged into an electric outlet)
She also has a converter that takes 120 volts AC and convert it to power 12 volts DC stuff (lights, fans, furnace, detectors, etc.) The AC amps used by the converter will vary depending on how many 12 volt things she uses at the same time which can be from basically 0-8 amps.
She probably cannot have a hair dryer and electric heater on at the same time. She may also need to turn off the electric water heater element when running the space heater.....as it may overload the main circuit when combined with the amps the converter and refrigerator are drawing in the background.
Just taking some approximations, she is using say 6 amps for the fridge and 3 amps from the converter. If you add the 12.5 amps from the space heater (or more if it's more than 1500 watts), she is using 21.5 amps on those 3 things alone. If the electric water heater element comes on, then you add another 12 amps and you immediately went to 33.5 amps or overload.
She will have to practice energy conversation and learn what can be on...and thus what has to be off at the same time.
Here is some better reading that also has some average appliance amp draws for both 120 volt AC and 12 volt DC:
Basic RV Electricity - RV Information (RV Maintenance)
RV Converters and Amp Draw - RV Information (RV Maintenance)