Originally Posted by Wazbro
On the other hand the way a PO wired my parents trailer with solar and an inverter, YES they definitely NEED a battery for 120V AC to work.
They have had to hookup the TV to the trailer while sitting in a site with power to charge the battery before they could get 120V in the trailer.
My camper is wired similarly - it's possible to get into a situation where our camper is dead in the water, with no on-board way to restart either the 12 volt
or 120 volt electrical system, which can happen when the batteries get low.
In my case, this setup is one of the four options given in the owner's manual for the inverter. I'm not a fan, although I admit it's generally not a problem... but it really freaked me out the first few times it happened before I put good batteries (and chargers) in.