We have a 52L fridge pretty much permanently in the Prado. It is fed by a 110AH AGM battery in the back. This is charged by a 25A dcdc charger and 160W solar panel. Whole setup is made to be removable as needed. The AGM battery and dcdc charger are in a battery box I made from sheet steel and the solar and alternator infeeds are via Anderson plugs. Alternator feed is also isolated with a manual circuit breaker.Subscribed.
Mrs George wants our newly acquired fridge installed in the Colorado, I know the basics, working on the details.
When we camp the 4wd will sit for several days at a time. Never had an issue even with rainy or overcast weather but it has dropped to about 60%. If you are just using it for camping then a solar panel will suffice as long as it is big enough. Cable size is very important especially if it is going in the back of the ute. Solar is fine with 4mm2 as the cable run is quite short and it will only be supplying 10-15A maximum. I ran 4B&S to and from the isolator into the back. Fridge cable is then the proprietary cable from the manufacturer. Should have pics somewhere if you want me to send you some.
EDIT: the only time we have had an issue was last camp, the trigger feed to the dcdc charger kept blowing the fuse. Took a while but tracked it down to a switch I installed for the reversing camera on the camper. That failed internally and as I piggy backed the 10A charging system for the power feed it was taking out that circuit. Everything was independently fused so it was something before the camera trigger (duh the switch). I did a temporary feed to trigger the dcdc and that worked for the camp, found the switch after pulling the dash and centre console to pieces...