Originally Posted by rick42wood
I know this is an old thread but it contains some bad advice. Don't plug your shore power into your invertor. Remember when you do this you are supplying 110VAC to the units charger which is supplying 12VDC to the battery(s) that your invertor is using to make the AC. Kind of a perpetual motion scenario. This could damage your units charger and your invertor and maybe generate a little smoke. It is not a good idea.
Actually, it is ok to plug the shore power cord into the inverter IF
you make sure that the converter is always off when the inverter is on. I wanted to wire mine that way, but I knew that sooner or later, I would forget to turn the converter off.
I decided that I needed to automate it. I connected a normally closed relay to the inverter. Then, I routed the power to the converter through the relay contacts. Now, whenever the inverter turns on, the relay activates, opens the contacts, and cuts off the power to the converter. The relay cost a whopping $6.
Although it wasn't really required, I spent another few bucks and wired a red neon pilot light across the relay coil, and a green neon pilot light across the converter input. Now, at a quick glance, green means shore power is on, while red means the inverter is on.
All in all, this is probably the simplest, least expensive, and most convenient way to add an inverter.