It is alot on how you like to camp off the power grid.
Back in the TENT CAMPING days just using flashlights and candles seemd to be all we wanted to do to.
Today camping with all of the 120VAC and 12VDC appliances it is a different style of camping.
In our case we will draw around 22 AMPs DC Current from our three 12VDC Interstate batteries (255AHs total) from 6PM to 11PM each evening which will run them down to their 50% charge state by 8AM the next morning. This allows us to do almost the same thing we do at regular camp sites with electric hookup with the exception of NO AIR CONDITIONING or HIGH WATTAGE MICROWAVE. Everything else is used to a degree. When the temps is cold the PROPANE HEATER 12VDC Fan becomes a problem with it pulling 6-8AMPS DC all night long...
Usually where we camp we are only allowed to use Generator from 8AM to 8PM and most of the time from 8AM to 10AM and then again 4:30PM to 7:30PM. Currently we can re-charge our 255AH 50% charge state batteries using our shore power cable direclty connected to the generator 120VAC. This will re-charge our 255AH battery bank back up to the 90% charge state so we can do this syle of camping all over again.
Adding SOLAR PANELs for us is just going to be to reduce the run time time of our generator set. I will need to get a good solid 17-20AMPS of DC CUREENT for each of my three batteries to get a quick re-charge using SMART MODE charging of my on-board PD9260C 60AMP COnverter/charger. It will take several 120WATT Panels to produce the 14.4VDC @ 20AMPS per battery to accomplish this re-charge plan.
Each 120WATT SOLAR panel will only produce 14.4VDC from its solar charger unit at 5-6AMPS when in high sun. Three 120WATT SOLAR PANELS will give me 15-18AMPS of DC CURRENT when in high sun. I will not be able to re-charge my 255AH battery in a quick three hour charge time and it may not even get me charged back up to the 90% charge state when I run out of high sun.
My way to get aorund this problem will be to run my generator at 8AM for about an hour to get past the high current demand starting at 53AMPS DC and slowly dropping back to around 8AMPS as the batteries start taking on their charge state. After that I can safley turn off the generator and let the three 120WATT SOLAR PANELs provide the smaller charge rate until the high sun goes away.
In my circumstances I cannot start each day/night run off my batteries unless I am am charged up to at least a 90% charge state.
Just passing all this along to show you that you just can't show up with solar panels and be somewhat successful about camping all day/night off the batteries without some good planning.
I'm pretty sure you will want to use some of your 120VAC and 12VDC appliances when camping off the power grid and not just use flashing and candles like we all did back in the TENT camping days.
Just some of my pre-planning for adding SOLAR PANELS soon for my OFF-ROAD POPUP camper.
I am planning on two120WATT SOLAR PANELS on the front part of my roof with a larger 240WATT SOLAR PANEL on the rear of my POPUP trailer roof.
Will look much like these google images
I will use ALUMINUM UNISTRUT sections to mount the solar panels on the POPUP roof