Voltage variations and Surge cut off.

joelc wrote:
We are hooked up to 50A service. I just recorded the voltages at different areas and I will note them below. I have a Progressive EMS/Surge suppressor hard wired in just before the breaker box. It has always worked well and has saved the coach several times at CG. My problem is it seems, there is a voltage rise on one leg at night, about 3 a.m. and when the heat pump goes on the EMS cuts the current. Both legs are high, but one is about 130V.

Taken 11 A.M. today
1. Voltage at post. Both legs 121 V
2. Inside at input to EMS Leg 1 = 128V 0 A Leg 2. 127 V 0 A
This simply cannot be accurate unless as Drew suggested you have a autoformer. Or of course one or both meters are no longer accurate.

The A/C voltage does drop during the day with no problems. If I shut off the electric water heater, there are no problems running the heat pump on heat during the night.
What PE error does the PI display? Your A/C or heat pump draws 18A per your post. Add 15A for hot water and that 33A on a 50A circuit. Well within 50A capability.

50A Basics: A 50A circuit is very dependent on a good neutral in order to keep the 2 legs at nominal voltages. Clean your plug and check all connections to and including the PI unit. It could be the CG and one way to confirm that is move to another CG as CG management usually assume your rig has a problem.