Desertdwllr
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Random power outage EG4 6500 split phase
- Thread starter Desertdwllr
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vanblokland
New Member
I removed the strap as shown in my picture. Was that not right?
Desertdwllr
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No, there is a small screw that bonds the case to the neutral bus of the inverter
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vanblokland
New Member
Well crap. Will try again. Really appreciate your help.
vanblokland
New Member
Removed the proper screw this time. Assume you have a schematic of the Inverter? I would never have figured out that was the bonding screw. Back on solar. Have already had two outages and all power being produced by solar. Batteries at 99%.
Sig Solar had me make these setting I am on SBU
Sig Solar had me make these setting I am on SBU
- Setting 12 SOC to go back to utility: 30%
- Setting 13 SOC to go back to battery: 100%
- Setting 29 SOC Low DC cut-off : 25%
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Adam De Lay
Solar Wizard
Are you using both PV inputs on both your inverters? Do you know what the approx voltages are on the PV strings when the disconnects happen?
I'm still trying to troubleshoot my disconnects as well. Don't know if it's coincidental or not, but if I turn off my PV2 on my phase 1 inverter, the problems seem to stop. Might be wishful thinking as I cannot replicate the issue on-demand. Seems to be more prevalent in the early mornings and settles down in the afternoon.
I'm still trying to troubleshoot my disconnects as well. Don't know if it's coincidental or not, but if I turn off my PV2 on my phase 1 inverter, the problems seem to stop. Might be wishful thinking as I cannot replicate the issue on-demand. Seems to be more prevalent in the early mornings and settles down in the afternoon.
vanblokland
New Member
Adam De Lay
Solar Wizard
Ok. It's happened to me a few times today. Very overcast day and when I disconnected PV2 on inverter 1, the issues stopped. I did notice in Solar Assistant that all my PV arrays are floating around 90V after MPPT (which I know is the minimum voltage), so not sure if that has anything to do with it either. Might be grasping at straws, but it's getting annoying.
Desertdwllr
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@vanblokland I wish I had a schematic, I didn't make this document, I read through it and made sure the n/g bond was removed with a multimeter after I removed the screw.
vanblokland
New Member
Update. Changes I made, removing screw and grounding in load panel did not resolve issue for me. Have replaced screw and grounding. Granted access to my Dessmoitor app to Signature Solar to see if we can find some answers. If I left the ground/neutral bonding screw out with out checking with them, it would void my warranty.
Desertdwllr
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Good to know, I'm very curious what the suggest to correct the issue
Adam De Lay
Solar Wizard
I'm in the same boat. Send SS all the info they've requested regarding the issue. Waiting to see what they have to say.
Desertdwllr
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If you are running split phase on battery or solar without removing all but one of the N/G bond screws you are introducing multiple n/g returns. This can cause circulating current to flow between inverters. I have observed this to cause things to happen ie flickering lights etc. You are correct that you might not see any difference however this fixed my flickering lights issue stopped my random power outages and the F80 fault I was getting on another system I built. This could have been a coincidence as I have not put my N/G bond screw back in to see if the problems I had come back. However to your point, the removal of the N/G bond did not change any of the symptoms that some others are experiencing. I'm curious to find out what signature solar comes back with. I might apply an external jumper to recreate the N/G bond that would allow me to clamp with a meter to see if there is current flow under normal conditions and report back.
I am experiencing similar issues as well and working with signature solar, still no solution. I have split phase EG4 6500's with EG4 48v batteries. The system seems to not have this issue when in SBU or USB modes and SUB is OK at night time. However if the solar panels are producing power (no matter how much) and in SUB mode my system does a similar thing with the power turning off and on.
Right now I manually run the system by making sure I am not in SUB mode (battery State of Charge SOC at setting 12) in then morning, if it is I will switch to USB before the sun comes up and will switch back to SBU mode once the battery SOC are above setting 13. I have setting 13 5% above setting 12 so that I use as little of utility power as possible. This has been working for over a week, but would rather not have to operate the system this way and it does not get the full benefit.
I have not remove the N/G screw and the grounding is only on the AC input side, I am not sure if my issue is in the grounding due to the USB, SBU and SUB (night time) working OK. Its looking more and more like it is in the software.
Right now I manually run the system by making sure I am not in SUB mode (battery State of Charge SOC at setting 12) in then morning, if it is I will switch to USB before the sun comes up and will switch back to SBU mode once the battery SOC are above setting 13. I have setting 13 5% above setting 12 so that I use as little of utility power as possible. This has been working for over a week, but would rather not have to operate the system this way and it does not get the full benefit.
I have not remove the N/G screw and the grounding is only on the AC input side, I am not sure if my issue is in the grounding due to the USB, SBU and SUB (night time) working OK. Its looking more and more like it is in the software.
Adam De Lay
Solar Wizard
So initially I thought my problem was only SUB mode when on grid bypass but I discovered a few days ago that it happens in SBU as well when in bypass. It only started happening after I hooked up both PV strings on both my inverters.
I started to notice a pattern that it seemed to happen more early morning when the sun came up or late afternoon when it was going down. It seemed like it was having problems when all 4 PV strings were around 90v while the Mppt was trying to find the best power point. Might be a coincidence but when I would disconnect pv2 on either inverter, the problems would stop. So right now I disconnected pv2 from my inverter 2 and am running they array through a Victron charge controller. Been doing this for a few days now and haven’t had any issues.
Where I live I get more cloudy days that not, so this problem was really bad when all 4 arrays were connected, but it’s only an issue when in grid-bypass.
I started to notice a pattern that it seemed to happen more early morning when the sun came up or late afternoon when it was going down. It seemed like it was having problems when all 4 PV strings were around 90v while the Mppt was trying to find the best power point. Might be a coincidence but when I would disconnect pv2 on either inverter, the problems would stop. So right now I disconnected pv2 from my inverter 2 and am running they array through a Victron charge controller. Been doing this for a few days now and haven’t had any issues.
Where I live I get more cloudy days that not, so this problem was really bad when all 4 arrays were connected, but it’s only an issue when in grid-bypass.
vanblokland
New Member
I have two grid power feeds on my property which share a common ground. This is my setup,
Can you clarify this statement, please?.
Replay # 11, Item 6 page 10 on the download on the link
Grounding and Bonding for MPP LV6548 and EG4 6500EX-48
Click on the orange download button above to get the document. This document shows how to handle grounding and bonding with the MPP LV6548 and EG4 6500EX-48 Warning 1) EG4 requires explicit permission from the distributer before removing the...
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