ShaunH Posted September 3 Share Posted September 3 Hello, Currently, I am off-grid, and my inverter has a ground-neutral bond, and my ground is earthed at my main breaker. I am upgrading my system to the below diagram. How should the AC outs of the two inverters be connected? Is it expected to connect them both to the same earth, and leave the ground-neutral bond? Quote Link to comment Share on other sites More sharing options...
Coulomb Posted September 5 Share Posted September 5 On 2024/09/04 at 4:24 AM, ShaunH said: How should the AC outs of the two inverters be connected? Is it expected to connect them both to the same earth, and leave the ground-neutral bond? That seems OK, but I don't understand what the resistors across the battery busbars are for. That will cause almost 2 A continuous drain from the battery. Maybe these are meant to be pre-charge resistors? If so, they are not wired correctly (or your diagram is not correct). Quote Is it expected to connect them both to the same earth, Yes. Quote and leave the ground-neutral bond? I would not. I assume that you have a generator for when you get days of poor solar weather; does your generator have a neutral-earth bond? If so, remove your existing bond. If not, consider leaving your existing bond there, and remove the screw near the double pole relay inside each inverter. That will remove the inverters' bond. You don't want two connections from neutral to earth, or you will have trouble with Residual Current Devices nuisance tripping intermittently. Quote Link to comment Share on other sites More sharing options...
ShaunH Posted September 5 Author Share Posted September 5 2 hours ago, Coulomb said: I don't understand what the resistors across the battery busbars are for. That will cause almost 2 A continuous drain from the battery. Maybe these are meant to be pre-charge resistors? Ha. I did not notice how that looks The batteries are called "Revov R100 (100Ah) and R200 (200Ah) batteries". 2 hours ago, Coulomb said: I assume that you have a generator for when you get days of poor solar weather; No, I do not have a generator. We just weather out those days. 2 hours ago, Coulomb said: consider leaving your existing bond there, and remove the screw near the double pole relay inside each inverter. That will remove the inverters' bond. To clarify, I have a ground-neutral bond, because of the inverter. It is not so in my main db. So, it sounds like I should leave the bond in the inverters? Otherwise, not have one at all? Quote Link to comment Share on other sites More sharing options...
Coulomb Posted September 5 Share Posted September 5 5 hours ago, ShaunH said: Ha. I did not notice how that looks The batteries are called "Revov R100 (100Ah) and R200 (200Ah) batteries". Ah! That explains the 25 mm² wire to the resistors as well! 5 hours ago, ShaunH said: To clarify, I have a ground-neutral bond, because of the inverter. It is not so in my main db. So, it sounds like I should leave the bond in the inverters? Otherwise, not have one at all? Oh! So that's your only neutral to earth bond. So yes, don't attempt to undo that bond. It will disconnect if you have a suitable AC-in source. So if you ever do get a generator, or borrow one or whatever, make sure that it has neutral connected to earth, as this will be your only neutral to earth bond when AC-in powers the loads. ShaunH 1 Quote Link to comment Share on other sites More sharing options...
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