It seems you want mains or generator as primary power. Inverter supplied UPS for the fridge 100% of the time with ability to add/remove other loads to UPS as desired ?
Said that, as a legitimate ‘ExPo guy, I suggest building your system on DINrail inside a suitable enclosure.
You can get just about any circuitbreaker, relay, terminal, etc. you want. Fit it to rails and assemble as desired.
I actually want to use shore as my primary power source. But the power is not 100% reliable where I currently am. It has gone out for up to 3 days while I was gone for work... thus loosing food from the fridge.
Unfortunately building my own entire power system is not an option at the moment..just trying to do best with what I have. Some day....
yeah I'm not getting why the hell anyone would have a trailer hooked up to both power mains and a generator at the same time... either you have mains power and dont need a generator, or you dont have mains power and need a generator.. plugging em both in at same time w/an ATS just seems beyond all reason, your generator wont even automatically start up if mains power is lost so what exactly do you think this unnecessary complexity is going to accomplish? Now if your trailer had a fancy built in Onan genset with a starting circuit then it might be logical, but nobody puts an onboard genset on a TRAILER.. only vehicles like an RV that already has a large fuel supply onboard.. I never liked any onboard generators, they are even more loud and obnoxious when they are mounted to the same chassis as your bed and you cant hide it behind a rock off an extension cord.
Some high end inverters like Victron can use very minimal power when idle, but the feature only works with analouge appliances.. it actually kicks on every few seconds and see's if there is any load, a microwave oven with a turn knob will work, but a digital microwave wont because you cant flip it on when its not powered.
So here is my situation - was trying not to share too much info. I travel 100% for work. 8 days on, 6 off is the 'typical'. It can be as little as no travel for a few months, to up to 3 months straight of being 'gone'. But the schedule can change daily....so I have no way of being able to plan. I am currently at a place with shore power. But this place is 'unstable'. Even being here, the power is not 100% reliable. So yes, I have a generator, and have used it a few times over the last year alone. However, there have been times I have been away when power died thus loosing food, or risking pipes freezing. With a combination of genset, solar, and inverter, the idea being at the least the fridge might be stable for up to 3 days of no power. Past that my neighbor can come turn on the genset to recharge things while I am gone. So reducing risk of loosing food, or freezing pipes (winter). To further complicate things, I may be attempting to purchase property which may or may not have power at the ready depending on varying factors. So I want the capability to be 'off grid' until (if I got said property) I can put power in place. My life/work situation is complex and has, well, relatively zero abiliyt to plan. It's just how it is. So trying to do the best I can with what I have currently, and avoid wasting hundreds of bucks on renting a place if I'm hardly there. To even further complicate, the current owner of the place I am is acting strange. So this in itself is not 'fully' stable, so having abilities to be off grid if i had to be nomadic for a period of time is desired. Necessary, I suppose not - one can always use a cooler, tent, and ice after all. But I have the trailer, so mine as well do what I can without doing more than what it's worth. Hope this maybe clarifies my situation and why I'm pursuing these ideas.
