The problem isn't the electrical, it's structural. I will be putting a 577 sq. ft. PV panel "sail" on top of an 8.5 ft. high 320 sq. ft. storage container. Thus, the whole thing becomes the solar mount and will require engineering for 20lb. snow load & 90mph wind. Because the container foundation, the anchoring of the container to foundation, the container, the solar panel mounts, and the solar panels all become structural members, I will need professional engineer "Wet stamped" plans w/calculations for the building permit. The PV side is simple, 2 strings of 12 feeding an exterior EP Cube. The EP Cube Gateway will simply replace the existing 200A breaker and sub-panel where the underground grid feed from the meter meets the house. The full 200A pass-thru of the EP Cube makes this the easiest ever PV system electrically as there zero devices other than the EP Cube & batteries, a 4-pole PV disconnect, and a 10KW stationary generator w/dedicated 299-gallon propane tank. The container will be parallel with and 8' from the south side of the house so no trenching and very short wire runs. Zero PV DC wiring on or touching the house will make our very touchy California homeowners insurance company happy.