There are a few points I see problems with - or I dont understand them correctly.
- The battery pack. The way its wired that will cause a mega short. Its connected as a full circle.
Another thing - why 6V batteries? For 24V, car or truck batteries would be the cheapest. Although ladd/acid batteries are not optimal for this. LiPo would be better, but costly at that size. - The panel are wire to 72V in 2 parallel rows. Does the charging regulator need that voltage? Because in line would be better, as in 144V at the main breaker.
Generally, this gives you or 48V - what are you planning to power with that? Best would be to reach the mains voltage in your country, so all the stuff you have in the house can run on that (converted to DC).
Well, just a suggestion.
RE: D.I.Y. SOLAR POWER SYSTEM BY @davethediyguy BEING ENERGY INDEPENDENT Part 2