Forum Discussion
Canadian_Rainbi
Oct 07, 2015Explorer
One thing to remember is that voltage drop is not just dependent on the size of the cord (ie resistance of the wire) but also the current flowing through it at the time. At our stick house I have a 15 A outlet at the well which is fed via #8 ( it think) wire from the house some 200 feet away. Add to this the 50A cord from the rig and an 80' # 10 extension cord and the voltage at the rig is about 109 volts. Until I plug something in! If my batteries happen to be fairly well down and I activate the Xantrex inverter/charger it will sometime drop out due to low voltage esp if it is trying to charge at 65Amps or more.
voltage drop equals resistance (in ohms) of the wire for example times the current (in Amps) running through the wire.
For example: In a length of wire having 1 ohm resistance having a current of one amp will cause a one volt drop. The same one ohm resistance at 10 amps will cause a 10 volt drop and at 15 Amps a 15 volt drop. A few LED lights may be fine, running the AC would not.
voltage drop equals resistance (in ohms) of the wire for example times the current (in Amps) running through the wire.
For example: In a length of wire having 1 ohm resistance having a current of one amp will cause a one volt drop. The same one ohm resistance at 10 amps will cause a 10 volt drop and at 15 Amps a 15 volt drop. A few LED lights may be fine, running the AC would not.
About Motorhome Group
38,706 PostsLatest Activity: Feb 01, 2025