valhalla360 wrote:
Old-Biscuit wrote:
100' with 50A #6 power cord 40A load will have roughly a 3-4 Volt drop from source to RV
120VAC....116/117VAC
You are assuming the house has good strong voltage and it won't sag under heavy load (and you are thinking 120v when a 50amp is 240v)
If the outlet is 50am, it should be 240V but don't be surprised to see 220v at the outlet.
At 220v, 20amp per leg jumps to around 22amps per leg (assuming the air/con units are on separate legs). So each leg sees 22amp @ 110v at the outlet and with voltage drop around 108v at the RV.
That's marginal for me where I start considering if should deploy the voltage booster or break out the generator.
If for some reason both air/con units are on the same leg, the amps doubles on that leg and voltage drop results in around 106v.
This ignores bad connections or issues with the wiring in the house, so you could easily lose another 2-3 volts in real life.
It's only 240VAC if you measure voltage across BOTH Hot Legs
Each Leg is 120VAC rated for 50 amps
Each leg feeds 1/2 of RV Main AC Panel Buss
40A on one leg will drop 120VAC down to roughly 116/117 VAC
Each leg can handle that amp load w/o issue
240VAC only comes into play IF the RV has a 240VAC appliance which very few have such appliances
