JAZ140 ✭✭

No combiner panel is necessary. That sma DC disconnect can accept 4 strings. 2 per mppt. Just so you don't hurt yourself please hire someone to put the SPD in at the DC disconnect. This is a very sim…

These little suckers will take care of the bonding. They even have two piece ones that you dont have to un wire the array to put it on.

How many watts are your panels? That inverer would operate better with a higher voltage string.. The ground from the area is a EGC and can go right to the EGC terminal. That's the three ground termin…

voltage could be a little low depending on how hot it gets. Are you using a tracker or fixed array? A few more panels would help you stay above the lower limits of the mppt on the inverter. 

I found the Manual. The 300 may be too low if you add more panels. The 600 volt one is for grid tie inverters. I would have your electrician wire that up. + - and GND...