I am planning on building a shop/office on the back part of my property about 75 feet from my house which is grid connected. I have had Electricians out to bid running a line out to the location and the numbers got me thinking that i could dip my toe into the world of solar for less than the cost of the line and I wouldn't have to dig a trench. I recently became over familar with my AC panel thanks to a generator line i recently installed but i'm less familar with the DC side of things so if i'm missing something, let me know. The shop is going to be 24x36 with three bays down stairs and an open living space above. I plan to wire it with standard romex, with outlets, switches and fixtures just like an AC setup. Except instead of connecting to grid, i'm going to connect it to my solar/battery setup. Most likely 1 30 Amp breaker and 3 15 Amp breakers. My initial design for the setup is: 4 100W panels (Link) Wired to my charge controller 40AMP 24V (Link) Charging 4 12v 100Ah AGM SLA Batteries (Link) This inverter has outputs that I will wire as the main in a simple breaker panel. Bonus, no need for an interlock, as we won't be attached to the grid! So any glaring issues I should know about?