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diy solar

diy solar

Grounding an inverter that feeds a house via generator inlet

scootaboy

New Member
Joined
Aug 25, 2025
Messages
1
Location
New York State
Hey folks - long time lurker, first time poster.

I'm setting up a small EG4 6000XP plus battery bank system purely to provide back up during storm outages. No solar (yet) and no hard-wiring into my home's split-phase panel.

The inverter will connect (in times of emergency) to my home via a generator inlet. The inverter and batteries are installed in my shed about 40 feet from the house.

I plan on charging the system via a 120V AC outlet because I do not have 240V accessible in the shed. I plan on doing this either through either the AC-In or the Generator-In. Then when grid power is down, I will then connect the AC-Out via a 30 AMP cord to the generator inlet and into the interlock system in my main home panel.

This means that - when charging the system will be charge via 120V AC. Then when feeding my home, all charging will be disconnected to allow the unit to output 240V AC.

TLDR - think of my inverter/battery set up as a gas generator alternative.


So my question is grounding. The inverter will be grounded presumably through the 120V AC cable into the main breakers when charging. Then when it is discharging it will be grounded via the 240V AC output into the main breaker.

Is this sufficient for grounding, or do I need an independent ground for when neither cable is connected, swapping over from charging to discharging.
 
Last edited:
I would call it good as described. Although I believe the chassis should be bonded to the ground if not already.
The inverter should also create a neutral-ground bond assuming the transfer switch will isolate the utility bond but maybe not.
 

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