? for electric/electronic experts.
I have camper with build in converter that also has 120V breakers on it.
Recently I added electric element for water heater and hard wire it to AC breaker. The switch on the wall has small light that comes on when heater is on.
I also added 1750W inverter, that is directly hook up to the battery and I just plug coffee maker or microwave to it when I need it.
Today just for the sake of it, I tried to to run AC off my 1750 inverter. I pulled main camper cable and plug it into inverter with converter breaker off. AC did not start, hesitating for few seconds before inverter went to overload, but what I noticed, the control light on heater element was on.
I flipped all 120V breakers off and the light was still on, regardless if the switch was on or off.
So somehow the inverter power with shore cord on it back-feed to the switch.
I know those control lights can run on big margin of voltage and I think that with my mechanical education I am pretty good in electrics, but that keeps me scratching my head with no idea.
So one more time - 120V on shore cable coming from inverter, with all 120 breakers off feeds somehow via ground and neutral wires to keep the switch control light on.
What da heck?
Recently I added electric element for water heater and hard wire it to AC breaker. The switch on the wall has small light that comes on when heater is on.
I also added 1750W inverter, that is directly hook up to the battery and I just plug coffee maker or microwave to it when I need it.
Today just for the sake of it, I tried to to run AC off my 1750 inverter. I pulled main camper cable and plug it into inverter with converter breaker off. AC did not start, hesitating for few seconds before inverter went to overload, but what I noticed, the control light on heater element was on.
I flipped all 120V breakers off and the light was still on, regardless if the switch was on or off.
So somehow the inverter power with shore cord on it back-feed to the switch.
I know those control lights can run on big margin of voltage and I think that with my mechanical education I am pretty good in electrics, but that keeps me scratching my head with no idea.
So one more time - 120V on shore cable coming from inverter, with all 120 breakers off feeds somehow via ground and neutral wires to keep the switch control light on.
What da heck?
