A few of us here have been struggling what to do with ground/neutral on our Growatt inverters as there is much different behavior on ground/neutral when on UTIL power vs Solar/Battery power. My inverter will always be tied to main panel to charge batteries if no solar available where the only G/N bond occurs in my system. After searching and actual testing, I've found that when I jump the neutrals AC input and AC output on the growatt, everything works as expected. I have 0 amps on ground output and basically 0 volts between ground and neutral on output AND input running in either mode. I've tested this on a 12amp continuous load and below are the results. Prior to this I had up to 56v running on the ground wire when in Solar/Battery mode and a good amount of amps. Jumping the neutrals between input/output definitely solved the issue.
11/20/2021 Test Results:
Utility 12a Load: (the N/G 4.6v is something on this circuit within the house, nothing to do with inverter and I am looking into this separately)
As I mentioned on previous tests while in Solar/Battery mode, there was a significant amount of voltage and current on the AC output ground wire which was caused me to rethink even using this product.
Big thanks to all those that helped guide me through many testing scenarios, especially @FilterGuy
11/20/2021 Test Results:
Utility 12a Load: (the N/G 4.6v is something on this circuit within the house, nothing to do with inverter and I am looking into this separately)
- Amps on G: 0.01a
- N/G: 4.6v (measured same on input)
- L/G: 119v
- L/N: 115v
- Amps on G: 0.02a
- N/G: 0.026v (measured same on input)
- L/G: 120v
- L/N: 120v
As I mentioned on previous tests while in Solar/Battery mode, there was a significant amount of voltage and current on the AC output ground wire which was caused me to rethink even using this product.
Big thanks to all those that helped guide me through many testing scenarios, especially @FilterGuy
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