I upgraded my OFF-ROAD POPUP 30AMP system to run all the things we wanted to run off of a larger battery bank using an Inverter setup for the 120vac items along with being direct connected to the battery bank for the 12VDC items.. This does not include the Air Conditioner or high wattage appliances like the microwave etc...
My working plan is do all of this in a one day-one night run off the battery bank and not go below the 50% charge state of the batteries. Then I am able to recharge the battery bank the next morning at 8AM back up to their 90% charge state when allowed to run my 2KW Honda Generator...
I connect the OFF-ROAD POPUP trailer shore power cable directly to my 2KW Honda Generator to just run the on-board converter/charger and do a few other items like make my coffee for the day and anything else the wife wants to do from the higher wattage appliances we have with us while the generator is running.
The 2KW generator runs the on-board converter/charger just fine for the three hours it takes to re-charge my battery bank using the built-in three stage smart mode on-board converter/charger. I can do this 50% to 90% charge cycles on my 255AH battery bank for 12-14 times and not do any damage to them. After this amount of time however I must do a good 100% charge state run time which for me is around 12 hours of generator run time. This is most often often not allowed at any of the public camping places we go to here on the east Side of the USA. This is usually when we pack up and head for the house...
Adding solar panels is my next step which not replace my initial use of 2KW generator each morning but will allow me to shut down the generator in about an hour's run and then finish my battery bank re-charge the rest of the day before I lose high sun. My initial charge run requires a good 50AMPS PLUS of DC charge current for the initial 15-20 minutes of the boost charge rate when the battery bank first gets hit with 14.4VDC charge voltage. This is more DC Current I can produce from my smaller solar panel install requiring the generator to be able to get me past this point of my re-charge cycle. After the initial DC current charge tapers back to around 8AMPS or so of DC Charge then the solar powers can take over and complete my daily charge cycle. Of course when it is a cloudy or bad weather day the generator is a must have item to do any re-charging of the batteries...
This seems to be the best approach for me when camping off the power grid with my OFF-ROAD POPUP camper setup...
Been doing the one day/night run off the batteries now since 2009 and know what to expect with my setup... It is all second nature for us now...
Roy Ken