How long is your run of 2/0 wire between the battery bank and the inverter?
I'm estimating the run will be 10' total positive and negative. 4' total from the inverter to the bus bar, and the other 6' from the busbar to battery. This is a conservative estimate and I hope it will be shorter when I go out later this week to cut and crimp the cables.
Something else you mentioned was the runs between the batteries and the inverter need to be equal on the positive and negative side. I was not planning on doing that. Because the way that my battery sits near my power board, the positive side is much closer than the negative side, so the positive and negative was a different length by 2'. Everything I've looked for said after the current leaves the batteries, you cut down on resistance by making the wire as short as possible, and that if the positive is longer than the negative, that's OK.
For the parallel series connection, great care was made when I cut the cables to make those the same length so all the batteries get the same juice. The picture I attached, the powerboard would be on the right of the picture with the Positive bus bar at the front and the negative bus bar at the back.
EDIT: I do not plan on coming close to the 2000 watt limit on the inverter, but would like to stay no more than 1300-1500 watts for five minutes, four to six times a day. No air conditioning, no hair dryers, but a couple of cups of coffee in a single brew electric cup and a couple of bags of microwave popcorn. Other than that, a ceiling fan, 100 watts I think and a 300 watt entertainment system would be the big loads.
In the future, I want to take this up to 24 volts and 600 AH battery bank to use the microwave and hair dryer more frequently, but that will really depend on how things go the first few times I take it out.