Step 1 is to get a good battery monitor. I don't know what the latest one to get is, but I have a link-10 that is by far the best investment in off grid camping I've made.
Once you have the monitor, you will begin to understand the relationship between your batteries, loads, and charging. Then you will have a better understanding of what you need for the way you camp.
And buy a bin the size of your sink to do dishes in so you can dump the wash water in the bushes instead of down there grey tank.
That's my $.02