Thanks for the replies. I wish I had the knowledge to better answer your questions (and help you help me trouble-shoot this). Wish I had more time with Calder's book! I'm going back and forth between reading your questions and responding. So, in no particular order:
- In regards to switching. Not sure which switching you refer to. On the Mainship's electrical panel I have breakers that allow me to take power from the shorepower, or the generator. Sorry if I am not clear on your question.
O C Diver
- In regards to the depleted batteries, I had a similar concern, and ran the engines for a while in order to charge batteries from the alternators. This brought the house bank just up to 12v (based on panel gauge). (don't like dock running... but trying to resolve.)
I did disconnect everything and waited several minutes before retrying. I also held the power button in on the main unit as the manual says until the power light flashed rapidly for a reset.
All attempts were made with everything (all breakers) off to ensure there were no backfeeds.
Several times the system would reset, and I would actually enter a charging mode... whereupon it would fault and show AC back feed after anywhere from 30 seconds to a couple minutes. Other times, it would go immediately to fault.
: I thought about bypassing the Magnum and getting power so we could continue our weekend. But, I didn't want to disrupt anything that may be the causation. Rather let it sit unmolested until someone knowledgeable can walk through it.
Re: Galvanic Isolator. Hmmm... wish I knew. Even if I was on the boat today, I wouldn't know what it looked like.
Again... I have a very basic understanding of 12v/120v systems. I do pick stuff up quickly. Just have not had the chance to go through the boat with someone who knows all this stuff and can explain it. Or specifically how my boat is wired.
There has been no work done on the boat. Nothing modified or added to the electrical system. Nothing plugged in. Apparently it has had this intermittent problem for some time according to what I now understand. I had no problems from December to June before I first saw it happen. Reset at that time after some playing with it. Had I better known the history, I would have had it worked on a couple months ago! But sometimes we hope it is a fluke and all is well.
I should know better.
Need a good electric guy or knowledgeable guru to sort it all out, then explain it to me!