My system works perfectly, but I have been looking for that conductive grease. What brand, how does it work and where did you get it. A lot of resistance can be eliminated by making good, solid connections. I have 2 12v in parallel, so for the whole circuit I have about 14 connections. The wire is nothing compared to the connections as far as resistance is concerned.
The panels I use are shade tolerant and do not need to be pointed at the sun, I have them glued to the top of my rig. They will keep up with anything I use during the day. A microwave is not typically used over 5 minutes in any meal preparation, perhaps 8 min if you are preparing two frozen TV dinners, of course my panels have to put back that usage but they have no problem doing it, I can get back to 100% easily. All the other AC appliances can be run appropriately and the solar charger can keep up with power usage and still be 100% all day long. Then at night I start with 100%. I don't know how many days I can go without sunshine, I could use 240 amp hours in that circumstance. I would rather only use 50% or 150 amp hours, but I understand that you can deplete 80% now and then without harming the batts to much. I recently tweaked the system and will be taking it out this fall, I will see how it performs then.
Jim, I put my MS2812 as close as possible to the batteries (4 large 6v). My longest 4/0 run is less than 3 ft of high-grade fine-strand welding cable. The batteries are in a vented box and there is a metal wall between the battery box and MS2812. I also used conductive "grease" to improve each connection and prevent corrosion. It would be better if I had 6 or 8 batteries and more solar charging power, but I can leave the inverter on during the day when dy camping and stay around 90% as long as I don't use the microwave too much. I kept all other high-current draws off the inverter subpanel. I have the inverter programmed to shut off below 12.2v, and it seldom drops below 12.4v. On a sunny day I'm solar charging at 15-18 amps off two 100w panels aimed at the sun, so two more panels would help. The batteries get topped off each night by the generator.