I have a 2003 DS 50amp It is currently plugged in to my 30amp server at my house. Im using 2×25ft 50amp cords.At first it's show 111volt turn on the A/c it drops 108 or so. What could be causing this? But with I run the generator it's fine 115 120. Thank you in advance.

Voltage drop through the extension cords.

if it drops below 108v i'd disconnect before damage is done. but what's a 'DS' and what is a 30-amp "server"? do you mean a 30-amp outlet at a campsite? but the first response is likely correct...voltage drop through the cords. did you measure the voltage at the post?

^^^ It says he's plugged into a 30 amp at his house.

I suspect DS is Dutch Star (Newmar). “Server” may be “Service”. Is it possible to move closer? You might want to consider upgrading the service to 50 amps. As above the length of cords will reduce the voltage. Generator is properly sized for the MH providing 50 amps, and is really really close by.

For a nominal voltage of 120V, ANSI allows a range of 104.4 - 127.2 as acceptable. However, NEMA requires electrical equipment be able to operate within a range of 103.5 -126.5. Following either requirement, the OP is able to use his AC within a safe, specified range.As an aside, the (one way) resistance of 50ft of #8AWG wire is 0.031 OHMS. The round trip resistance total would be .062 OHMS. Assuming a single A/C running at 14Amps, voltage drop is (E=IxR)=14x.062= 0.868V If both A/C units are turned on, total amps would be 28, or 28x.062=1.736V drop. With 111V in at the house, minus 1.736V drop, the voltage at the RV should be about 109V. OP claims 108V or about right. Still within "code" range of 104.4V or 103.5V for acceptable operation.

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wildtoad
Explorer II
Sep 27, 2022
I suspect DS is Dutch Star (Newmar). “Server” may be “Service”. Is it possible to move closer? You might want to consider upgrading the service to 50 amps.

As above the length of cords will reduce the voltage. Generator is properly sized for the MH providing 50 amps, and is really really close by.
Bruce_Brown
Moderator
Sep 27, 2022
^^^ It says he's plugged into a 30 amp at his house.
rk911
Explorer
Sep 27, 2022
if it drops below 108v i'd disconnect before damage is done. but what's a 'DS' and what is a 30-amp "server"? do you mean a 30-amp outlet at a campsite? but the first response is likely correct...voltage drop through the cords. did you measure the voltage at the post?
Bruce_Brown
Moderator
Sep 27, 2022
Voltage drop through the extension cords.

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