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EG4 6500kw system won't provide 240V

W

Wesley Walker

New Member
Joined
Aug 12, 2023
Messages
11
Location
Sulphur Springs, Tx
Very new to off grid with a pair of EG4 6500 kw's and 30kw of batteries. I set my system up almost a carbon copy of Will's. We have consistent 120V on both legs at breaker panel and everything on both sides work fine. Problem is we can't get 240 out it. My wife (my techie) has followed all of one of Sig Solar's tech's directions on configuration but when our load (ice maker) is applied, cross leg voltage steadily drops to as low as 15V, all the while single leg stays at 120V. Was advised by Sig Solar tech that setting 28 should be should be set to 2p1 and 2p2 with setting 5 set to USE...when that was set as advised the system turned off and started sounding an alarm...led light along the front went red at that time. Are there any other setting that should be looked at to fix this problem?
 
Sometimes the settings don't seen to apply or be retained. Have you verified one inverter is set to 2P1 and the other is set to 2P2-180?

The communication cables need to be installed and their connectors seated well.

The current sharing cables should not be used at all.

USE is fine for parameter 5 on each inverter.
 
Madco said:
If the leg to leg voltage is not staying at a steady 240V and seems to move around, then it sounds as if the two inverters are not phased correctly. There is two variants for the L2 inverter, 2P2-120 and 2P2-180. You want the 180.
Click to expand...
It is not that it is just simply not steady it is that it genuinely does not hold up. We watched the volts literally fall to double digits one evening. I am going to check the 2p2 setting right now and see what I get.
 
got a picture of the cables to share? Identical setup, fewer batteries. 2p2-180 is critical for the second inverter and a restart is necessary if you change that setting.
 
F86 is "AC output setting is different" according to the manual - whatever that means! But it sure seems to describe the issues you're having. As 5275K alludes, the parameter 28 settings can be hard to get set. The proceedure is arcane. Are you absolutely sure that the L1 inverter reports 2P1 and the L2 inverter reports 2P2-180? Also are the communications cables plugged into the exact ports shown in the manual?
 
You have a limited amount of time to save option 28 and it must be done in standby mode. Once successful, you should see 2p1 on the top left corner of the screen on one inverter and 2p2 on the top left corner of the screen for the other inverter.

If you don’t have the grey communication cables connected properly, the inverters won’t stay powered on because they can’t detect the other inverter.
 
I found with AC power in on it doesn’t drop out of standby time like all other inputs. Only way I’ve ever been able to make them stick. My 2p2 loses all its settings on power downs so I’ve gotten pretty good at resetting it.
 
sburcham said:
I found with AC power in on it doesn’t drop out of standby time like all other inputs. Only way I’ve ever been able to make them stick. My 2p2 loses all its settings on power downs so I’ve gotten pretty good at resetting it.
Click to expand...
Confirm those setting you make by going back into them an viewing.....are they really being saved? Or does it just look like it is saving them....there is a reason i am asking this.....
 
xtrorion said:
Confirm those setting you make by going back into them an viewing.....are they really being saved? Or does it just look like it is saving them....there is a reason i am asking this.....
Click to expand...
I figured there was a reason...and I have found it very difficult to actually get them to save...as many have said it appears to have saved but is took a while to get it to actually save it...
 
Not saying this is the issue but some units have apparently shipped with bad EEPROM chips where I believe the settings are stored.

Given the proceedure for setting parameter 28 is more than a little arcane, I would review the proceedure and just make sure sure you're doing it correctly.
 
xtrorion said:
Confirm those setting you make by going back into them an viewing.....are they really being saved? Or does it just look like it is saving them....there is a reason i am asking this.....
Click to expand...
With AC power on they generally stay but trying on battery quickly before it shuts off seems to be a crap shoot whether it takes or not.
 
sburcham said:
I found with AC power in on it doesn’t drop out of standby time like all other inputs. Only way I’ve ever been able to make them stick. My 2p2 loses all its settings on power downs so I’ve gotten pretty good at resetting it.
Click to expand...
This might be due to a known issue. I would contact SS and let them know. You may have a bad EEPROM.
 
My experience has been: follow the proceedure, stand on one leg, hold your tongue just right, and cross your fingers. Then you have to repeat until they "stick".

I guess hope may help too!
 
Adam De Lay said:
This might be due to a known issue. I would contact SS and let them know. You may have a bad EEPROM.
Click to expand...
Too late already took the upgrade so no warranty anymore they are just back ups now and I know how to work around. I should have rma’d it first but impatience got me first. I may eventually send it in for repair but for now it’s okay.
 
sburcham said:
With AC power on they generally stay but trying on battery quickly before it shuts off seems to be a crap shoot whether it takes or not.
Click to expand...
Yeah when your inverter is in standby mode (not inverting) you “might” get 30 seconds to set and save your change while only on battery power. If your have AC In coming in or PV power coming in, the inverter will remain on in standby mode until the power is cut.
 
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