Off Grid Well Pump Grounding and Backup Power Options
I am needing some advice/recommendations regarding an off grid well installation. We are going with the Grundfos SQFlex system, and will be dedicating a small 4 panel 860W array for our pump that will be installed close to the well. Our house will be about 400 feet from the well, and I would like to allow for a backup power source to power the well pump (generator and or AC from inverter) should the need ever arise. My direct question is regarding the grounding situation. The well casing and pump must share a common ground connection. If I want to run a dedicated buried power line from our house to the well pump as a backup, would the house ground and well ground need to be bonded. If I understand correctly from the NEC, the bonding wire would need to be no less than 2 gauge since the largest wire in the system will be 4/0. Has anyone done this, do you have any thoughts?
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