RV shore power plugged into inverter run by 12v battery and 100w solar panels

Not sure I follow. 100W of solar is a basically a trickle charger to keep your batts charged in storage. beyond that, you want to plug your shore power cord into your inverter to run things? If your inverter is wired correctly it uses your batteries to run your 120V appliances. And one battery isn't going to give you many AHs. Why wouldn't you just plug your shore power into an actual pedestal/outlet? Maybe I don't understand what it is you are asking. 

Sounds like, instead of "rigging" the system into thinking it has shore power, you need more solar and more batteries and let the setup work they way it was designed. 

I hope you listened to "WaytoRoll". Otherwise; you are soon going to learned the hard way on your first trip out.

🤔

wow, 100 watt kit, thats good for trickel charging batteries if you have no draw, but that has been said before..   so Let me see if I got this right, you want to take your shore power and plug it into your inverter.  there are a few problems with this, first your 750 watt power inverter is that max or continuious?  realy unless you are just running a couple lights, or charging a laptop , or leaving the lights off and runnign a fridge thats about all its good for.  the second thing, is unless you unplug you're converter as soon as you plug in your going to blow the inverter so your not going to be able to charge your batteries, as that would just be silly using battery power to charge your batteries.. and that 100 watt solar panel set up isn't going to do nothing.  

what people don't seam to understand about solar is you have 4 to 6 hours of full panel output (or close to it) depending where you live, the rest of the time before is a ramp up and ramp down.  I average when it is all added togeather about 7 to 8h of full output in the summer and 5 to 6 in the winter, so inorder to be self sufficient with solar you have to be able to make all the energy you use in 24 hours in about 5 to 6 hours of solar output.  so my 5th wheel in the late fall when I am using the furnace could use about 100AH in 24 hours, so to replace that I have a solar system (480watts) that puts out 22amps duting the peak time and will recharge 99ah in aproximatly 4.5 hours so in the summer I am charge by noon usaly (less power usage) and in the winter I am at 100% before it gets dark.  I do want more but that is because I want to start running my bar fridge when camping also.  I also have four 6V batteries in there that will give me about a 2.5 day capacity in the winter, 3 or 4 day backup in the summer.. 

so there are ways to do it that don't realy break the bank, if you have to buy your solar system from the rv shop and have the install them then ya it is expensive, but if you cvan do it your self you could get a 400 watt panel for under 200 bucks in the US, a controler for under 150 so thats 550 for 800 watts plus 50 bucks for wiring and brackets...  

Yes in general this works.  Works to the limit of battery capacity and two batteries may not last long.  And assuming this is a 30 amp RV really needs 3600 watts to run everything normal, the 750 watts will limit what can be run.

Microwave, A/C, electric water heater must remain off.  Fridge must be set to propane only or may draw 350 watts near continuous and drain the battery.  Most coffee makers etc are 1000+ watts.

Run a small tv, charge phones and a laptop is all good.  What else do you expect to run?

There are some inverters that cannot be connected to the RV system and the RV battery as they don't like the negative battery and inverter sharing the same ground.  Need to isolate the battery so that it connects only to the inverter.