"A prudent man sees danger and takes refuge, but the simple keep going and suffer for it."-- Proverbs 22:3
The Radian is quality equipment. It will do everything the Connex will do. Those are the two leaders for inverters in my book. Connecting the inverter to the power grid allows the inverter to synchronize and connect. Then you can configure the inverter to switch to the grid at night and not load your battery. Your battery will last longer that way. Battery replacement cost is the big solar expense. On the good side, every 7 years you get to decide if you want to go with the same battery setup or change to a new, larger, better battery.The GS4048A is just barely enough to run your well and other equipment but will get it done. The GS8048A is all the inverter you will need. You can expand the GS4048A by stacking a second one later. (costs more that way)