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EG4 Official Neutral Ground Bond Thread.

We know this has taken a while...

Several use cases change the rules for each scenario, we had a thorough review of industry approaches across manufacturers and then implemented Neutral routing changes via software to enable maximum compliance on the most likely instances by default.
 
The default configuration common in inverters is to have a bonding screw in place with a neutral bypass relay to support having a bond in a mobile application provided by the inverter when shore power is disconnected and use the shore bond when shore power is connected.

This is to prevent the very serious safety risk of either an unbonded mobile application or a second bond at the mobile unit a long distance away from the shore power main bond.
 
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I saw this last night. Thanks for doing it. However, for someone like me, who has NO AC input on my off grid Eg 6000, which apparently DOES have the N-G bonding screw, it took HOURS of research to determine that since I had the N-G bond inside the unit, I did NOT need or want the N-G bond in the AC out sub panel that I build for items being powered by my inverter. Unfortunately, I see that the latest latest FW release, V 13, now "bypasses" the N-G bond screw. So now, IF I do the latest FW update, do I have to go reconfigure the subpanel and put a bond in the subpanel?? It looks like some of these patches or updates are being put out there, but may not be universally applicable to all units. At least the latest one has a cryptic change log advising that it bypasses the screw. Tom
 
Bond the sub panel in that case as our video describes. we had to state the designed practice for all units shipping forward (with this firmware onboard) as well as for all people updating their firmware. Will add your type case to the Readme file; good apps input :)
 
I feel like something a little clearer than a dry erase would be in order. I appreciate the effort on making this video. I personally am going to have to watch it a few more times before I understand and can apply this to my split phase 6500's with a Reliance transfer switch and no AC in but the neutral bonded at the panel.
 
PunchySunshine said:
I feel like something a little clearer than a dry erase would be in order. I appreciate the effort on making this video. I personally am going to have to watch it a few more times before I understand and can apply this to my split phase 6500's with a Reliance transfer switch and no AC in but the neutral bonded at the panel.
Click to expand...
If you are no AC input then you bond the output. :)
 
I have 2x EG4 6500. Split phase. I am completely off grid. No Inputs to either inverter.
One old model inverter w black terminal units. One newer one with grey terminal units.

I have G/N bond in my sub panel before my main panel.

So I have permission to remove the G/N bond screw in my older black terminal unit?

I believe this is the right thing to do, but I have heard I need permission from EG4 to do it so that I don’t void my warranty. I also remember reading that someone from SS said that removing this screw hasn’t voided the warranty since 2020.

Just want to make sure I’m doing the right thing here.
 
TomH fwtx said:
I saw this last night. Thanks for doing it. However, for someone like me, who has NO AC input on my off grid Eg 6000, which apparently DOES have the N-G bonding screw, it took HOURS of research to determine that since I had the N-G bond inside the unit, I did NOT need or want the N-G bond in the AC out sub panel that I build for items being powered by my inverter. Unfortunately, I see that the latest latest FW release, V 13, now "bypasses" the N-G bond screw. So now, IF I do the latest FW update, do I have to go reconfigure the subpanel and put a bond in the subpanel?? It looks like some of these patches or updates are being put out there, but may not be universally applicable to all units. At least the latest one has a cryptic change log advising that it bypasses the screw. Tom
Click to expand...
You could update firmware using the Mobile Firmware download.

If your system is working well, I doubt I'd update the firmware.
 
mountkay said:
I have 2x EG4 6500. Split phase. I am completely off grid. No Inputs to either inverter.
One old model inverter w black terminal units. One newer one with grey terminal units.

I have G/N bond in my sub panel before my main panel.

So I have permission to remove the G/N bond screw in my older black terminal unit?

I believe this is the right thing to do, but I have heard I need permission from EG4 to do it so that I don’t void my warranty. I also remember reading that someone from SS said that removing this screw hasn’t voided the warranty since 2020.

Just want to make sure I’m doing the right thing here.
Click to expand...
If you have a sub panel combining your inverters before going to your load panel and it is bonded then that is right.
 
timselectric said:
Hopefully just a terminology mistake.
Click to expand...
SignatureSolarJames said:
If you have a sub panel combining your inverters before going to your load panel and it is bonded then that is right.
Click to expand...
Yes it’s exactly as James Says. Just a panel before my main house panel where the inverters combine, and also a place where I have the option to add in a generator backup.
 
mountkay said:
Yes it’s exactly as James Says. Just a panel before my main house panel where the inverters combine, and also a place where I have the option to add in a generator backup.
Click to expand...
The combiner panel connected to the AIO outputs (without inputs connected to grid) is your main panel. And the correct place for the N/G bond. Any panel after that is a sub panel. What used to be your main house panel, is now a sub panel. (Also known as the loads panel) neutrals and grounds should be separated there, now.
 
timselectric said:
The combiner panel connected to the AIO outputs (without inputs connected to grid) is your main panel. And the correct place for the N/G bond. Any panel after that is a sub panel. What used to be your main house panel, is now a sub panel. (Also known as the loads panel) neutrals and grounds should be separated there, now.
Click to expand...
Well now I'm really confused! I thought the main panel WAS the main panel and that's where the N+G bond lives.
 
This is my take away with 6500EX-48 inverters that were purchases 2/2023. My application is "mobile" (sometimes grid grounded, sometimes not). I'll have 2 of these inverters configured out of phase for 240V.

  • I need to install the "mobile firmware" via https://eg4electronics.com/downloads/
  • Install a M2.5 x 10mm bonding screw in ONE of the inverters.
  • Main panel (inverter output) - neutral and ground are NOT bonded.
 
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