My diy install is almost done pending final inspection. I am running 3 6000xp's in parallel and currently have 4 lifep04 diy batteries with jk bms. What charge voltage should I set in the inverter? Also will the 6000XP communicate with the JK BMS? I have all the bms's in parallel and communicating together. What settings would I need on the 6000xp in order for the inverter to communicate with the master jk bms?
EG4 6000XP Battery/Charge Settings
- Thread starter doox00
- Start date
EG4TechSolutionsTeam
Online Support for EG4 Electronics
The 6000XP can communicate with these battery protocols. If your battery’s BMS supports any of these protocols, it could be possible for them to communicate.
I have the inverter talking with the bms. I currently have 4 batteries with jk bms in each one, they are all parallel to each other, the bms's. I have the master bms connected to the master 6000xp and they are communicating just fine, what about the other 2 inverters, they are still set for lead acid, do I run an ethernet cable on each one of them to one of the other batteries/bms and change them to lithium as well?
EG4TechSolutionsTeam
Online Support for EG4 Electronics
You would want the BMS on the master battery connected only to the master inverter.
EG4TechSolutionsTeam
Online Support for EG4 Electronics
With "Share Battery" enabled, the inverters should communicate with each other through the lithium battery type.
So how about the other settings, do I need to set all the settings in each inverter or will the slave inverters automatically adopt the settings of the master inverter regardless of which settings you put into each of the slave inverters?
EG4TechSolutionsTeam
Online Support for EG4 Electronics
When configured for parallel, the settings would automatically sync. The exception would be if "Shared Battery" was disabled on the paralleled inverter.
Okay thanks, is that all settings though, not just battery?
EG4TechSolutionsTeam
Online Support for EG4 Electronics
That is correct, it would sync for all settings.
Can you verify my settings for me? I have grid power hooked to all 3 inverters, all share battery bank. I would like it to use grid to charge batteries once they are down to ~10% (or a set voltage, I have to figure out what voltage that would be with lifep04 cells). If for some reason batteries are dead or below like 5% and no solar available then would like the inverters to use grid to power the house. Do you see any settings I need to adjust, everything look okay in general?
EG4TechSolutionsTeam
Online Support for EG4 Electronics
I would set the AC Charge to start based on the battery's SOC, beginning charging at the percentage where you'd want it to activate. However, I'd make sure this aligns with the On-Grid EOD SOC, as the batteries likely won't reach the AC Charge start point if it's set at 10% while the On-Grid EOD SOC is set at 15%. Otherwise, the settings look good.
dtbaker61
New Member
something to be aware of with the eg4-6000xp running 'open-loop' with LFP batteries is that the internal charge controller does NOT give a very LFP friendly charge curve with the current firmware. I logged a bug report with eg4 in August, and they still have not issued a patch/update. Currently is is not possible to set charge parameters by Voltage to obtain a proper CC/CV charge curve. There is a but that holds the batteries at end of charge voltage for 2 or 3 hours after charge is "done"
The closest you can get is by setting:
battery type = lead acid
Vcharge = 56.2
Vfloat = 54.0
Veq = 54.5, days=0, time=0
The eg4 documentation says to set Veq to 0, but the settings interface does not allow 0. I have found thru trial and error that the settings shown above are the closest approximation to get a full charge with a CV phase that gives the battery internal BMS time to balance cells without holding internal cell voltage too high for too long.
The goal is to see a CV phase at the end of charge where the current drops as the battery approaches end of charge voltage, andis a low enough current to enable the BMS to balance, and then end the charge when current drops below .02C and drops to Vfloat.
The closest you can get is by setting:
battery type = lead acid
Vcharge = 56.2
Vfloat = 54.0
Veq = 54.5, days=0, time=0
The eg4 documentation says to set Veq to 0, but the settings interface does not allow 0. I have found thru trial and error that the settings shown above are the closest approximation to get a full charge with a CV phase that gives the battery internal BMS time to balance cells without holding internal cell voltage too high for too long.
The goal is to see a CV phase at the end of charge where the current drops as the battery approaches end of charge voltage, andis a low enough current to enable the BMS to balance, and then end the charge when current drops below .02C and drops to Vfloat.
If I were to disable ac charge altogether when the battery dies will the inverters automatically just power from the grid and stop when there is enough solar or battery to turn off grid power? I am leaning towards never allowing grid to charge the battery as I think this is less efficient then just using the grid when there is no solar/battery.
EG4TechSolutionsTeam
Online Support for EG4 Electronics
If the grid is available, the system will switch to grid power based on the on-grid EOD setting. Once PV is restored, the battery will begin charging, and loads will switch back to self-consumption mode with AC charge disabled.
Is there a way to set it to charge the batteries to full using the grid, I don't want it to stop charging until the batteries are fully charged and balanced. I currently have it set to lead acid, set the charge voltage to 56.2, vfloat 54 and veg 54.5. It is charging via the solar panels now, eps is off on the inverters (running the house off grid atm) but it is overcast and obviously won't charge when the sun goes down, would like to charge from grid until they are full.
EG4TechSolutionsTeam
Online Support for EG4 Electronics
Yes, under the Charge settings you would set the "AC Charge Based on" to voltage, and you would set the Start and stop voltage.
Yeah I had that but it would not kick on unless I turned on EPS, I did that and it is charging with grid now.
EG4TechSolutionsTeam
Online Support for EG4 Electronics
Yes, you would need to have the EPS on since the inverter is taking the AC power and converting it to DC power to charge batteries. If you charge batteries with PV only, you will not need to have the EPS on.
Hey there, I received this warning 3 times in 30 minutes, ideas what this means? The load has been "normal" 3-4k total load on the 3 inverters.
| W028: EPS Over load |
EG4TechSolutionsTeam
Online Support for EG4 Electronics
How big is the battery bank connected? Also, what is the current discharge current limit set to? If set to 140, I would recommend increasing this to
351A if your battery bank would allow for this.
351A if your battery bank would allow for this.
I have 4 15 kwh batteries with 16 306AH cells in each of them connected atm. I just switched it all back to closed loop with the inverter communicating with the bms and that is working it appears but I have ac grid charging turned off but it is still using it a little bit. The batteries are low charge, it is overcast and 1000 or less watts of solar throughout the day, it is using the solar and an additional 1000-1500 watts of grid ac to charge them. What am I missing as far as settings that is allowing it to use grid to charge?
Okay, now all of a sudden it is not using grid to charge, it has been for the few hours though.. very strange...
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I am getting the same error again, EPS Over Load, 6 times in a few hours. Discharge set to 400 amp.
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