EG4 6000XP EPS goes off under surge load

[BrianVeg]

My 2 X 6000XP’s EPS output goes off when my AC starts (with a soft start) when grid is not present.

It throws 2 warnings on the monitoring site and then inverters shutdown:

• EPS Voltage High, followed by
• PV Isolation Low

Here’s my configuration:

• 2 X 6000XP’s
• 4 X Ruixu Batteries
• PV is present somewhere around 2500 to 3500 watts when issue happened

Max Discharge current is set to 280amps (140amp per inverter based on EG4’s recent recommendation)

On the soft start last peak current shows 26.6 amps X 240V = 6,384 watts

Other loads are approximately 1kW.

When I turn the Grid back on the system goes into bypass mode and loads are powered.

The PV Isolation low error remains for about 20mins, once that error clears everything goes back to normal.

Thoughts?

 

[EG4TechSolutionsTeam]

What was the battery percentage when this test was conducted, and were they powering other loads simultaneously?

 

[timselectric]

The PV Isolation low error remains for about 20mins, once that error clears everything goes back to normal.

Thoughts?

PV isolation low error seems odd.
It makes me wonder what is getting through the isolation.
Is everything grounded correctly?

 

[BrianVeg]

What was the battery percentage when this test was conducted, and were they powering other loads simultaneously?

Battery Percentage was approx 38%. The only other loads that were being powered were my steady state loads of ~1kW

Is everything grounded correctly?

I truly believe it is. It’s a weird error in that it only occurs after EPS Voltage High.

 

[Adam De Lay]

What happens if you turn off PV and then try and start the A/C?

 

[BrianVeg]

1. Air off
2. AC in to inverters off
3. Loads at 1685watts
4. Battery at 26%
5. PV off

Turned Air on -

1. EPS Voltage High and
2. All EPS output off.

Fans rev’d up high for a bit

No PV Isolation error

Turned Air Breaker back off and EPS output came back! EPS Voltage High Warning cleared

 

[ChrisG]

Did this work previously or new behavior?

 

[BrianVeg]

Did this work previously or new behavior?

Good question. I just put PV into production about 2 weeks ago. Before that I was primarily running AC First. I thought I tested this when I put my Soft Start in, but really can’t be 100% sure.

 

[BrianVeg]

With AC In PRESENT (meaning on) and the Max Discharge Current set to 280amps I can run both the Air and Water Heater from Battery or PV and Battery.

 

[ChrisG]

With AC In PRESENT (meaning on) and the Max Discharge Current set to 280amps I can run both the Air and Water Heater from Battery or PV and Battery.

So grid breaker on and discharging batteries(inverting), it works. If grid breaker off and discharging(inverting obviously), it does not?

If statements above are true, please check your log to see if you still get EPS overload even with Grid available.

 

[Adam De Lay]

I’m not super familiar with multi-6000xp installs. Do you have to increase the output current on both inverters? It almost seems like one isn’t picking up the load.

 

[ChrisG]

I’m not super familiar with multi-6000xp installs. Do you have to increase the output current on both inverters? It almost seems like one isn’t picking up the load.

Wonder if battery has a low cell and is going into undervolt protection

 

[BrianVeg]

Do you have to increase the output current on both inverters?

They work in parallel, what ever setting on put on the first inverter is picked up by the 2nd inverter.

So grid breaker on and discharging batteries(inverting), it works. If grid breaker off and discharging(inverting obviously), it does not?

Correct

 

[BrianVeg]

Wonder if battery has a low cell and is going into undervolt protection

Not sure - I’m just about to make an RS485 cable to check out the batteries using Ruixu’s tools

 

[BrianVeg]

I just updated the title - my inverters don’t shutdown, rather EPS output goes off

 

[ChrisG]

Did you check to see if you still get EPS Overload with grid available?

 

[BrianVeg]

Did you check to see if you still get EPS Overload with grid available?

Yes and I do not. Only with grid unavailable.

 

[BrianVeg]

EPS Overload

Just to be clear - I’m getting EPS High Voltage warning and not EPS Overload

 

[BrianVeg]

@EG4TechSolutionsTeam any thoughts on this?