Nanc and I went out on a quick trip with some friends. We planned for four nights, but ended up coming back after only two. The temp hit the high 90's and our dog was really suffering.
I am now experiencing the rapid battery voltage drop issue mentioned by several of you earlier. Obviously the higher temps cause the Dometic 65 L frig to run much more frequently. We were camped in a heavily wooded area. I tried chasing the sun with my 180 watts solar panel. When any amount of light hit it, I saw some charging occuring. In direct sunlight it was hitting better than 13.4 volts. but the batteries just kept pumping out more amps than the panel could provide. I eventually had to start the car several times; this provided 13.8+ v, but again no improvement long term via the batteries. The trailer battery charge finally dropped so low that the Dometic shut down automatically. this was approximately 11.0 v. I let this happen just to see how low it would go.
So I will be reviewing everything written so far here concerning this issue. I'm not that up on charging so will have to figure out what to do. As an aside, my alternator is an aftermarket 270 amp unit. After a quick 40 minute drive back home the trailer batteries were up to 12.5 v. That seems to be their base level for car charging. I think that the problem lies in that they do no carry enough amps for even a two night camp in hot temps. I never had this issue when camping at lower daylight temps.