Grid Loss even thou the grid is available (Multiplus(s) in parallel)

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denzel asked Aug 01 2022 at 5:23 AM

Grid Loss even thou the grid is available (Multiplus(s) in parallel)

Good Day,

I have an issue with my setup going into inverting mode even thou the grid is available , i also noticed that even if the is no ac loads the vrm reads a value between 30W and 40W, using ve config the units have no errors:

My setup overview :

3 Multiplus in parallel

FW version : 497

1 250/100 MPPT

6 Victron 220ah gel batteries .

GX Color control .

Im using an assistant HUB-1 keep batteries charged feed surplus back to grid.

@Guy Stewart (Victron Community Manager) please can you advise.

Regards

grid multiplus in parallel

grid.png (20.1 KiB)

state.png (24.0 KiB)

fw.png (18.1 KiB)

ac-loads.png (55.1 KiB)

5

Alexandra ♦ commented · Aug 01 2022 at 5:48 AM

@Denzel

Your system itself will be consuming power hnece the 40W. (The three inverters themselves and any other components needed to run them).

Grid rejection may be the cause of no grid conditions. You will need to investigate what is out of the grid code parameters you have set. If it is all in parameters it will possibly be resistance in the connection to the grid.

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denzel Alexandra ♦ commented · Aug 01 2022 at 5:56 AM

Hi Alexandra ,

Thanks for your reply. I concur with the consuming power. However the grid issue is baffling as i had a mutlimeter on the AC input side of the inverters and at the time vrm read grid loss alarm the AC input side read 230V .

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Alexandra ♦ denzel commented · Aug 01 2022 at 6:12 AM

Then it is resistance to grid possibly more a rejection based on that.

Sometimes odd stuff like neutral earths. Wiring too big is another one.

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denzel Alexandra ♦ commented · Aug 01 2022 at 6:40 AM

I will check the grid settings via ve config. The wiring is is as per spec and almost very similar in lengths.

will update the post.

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Alexandra ♦ denzel commented · Aug 01 2022 at 9:37 AM

It may not necessarily be the set up. I mean the resistance in the lines to grid. And as nickb mentioned can factor in with the rejection.

I had an experience at home with the grid, victron was happy, a tree fell on the lines. After the repair (the usual twist back together) the victron rejected the grid more often.

I have also seen where more foliage from trees touch the lines, more grid rejection.

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Answer 1 · 2022-08-01T08:08:25Z

nickdb answered · Aug 01 2022 at 8:08 AM

It is behaviour I see regularly here when the grid is under strain, voltage within the limits but the system starts inverting. When the grid stabilises everything returns to normal.

3

denzel commented · Aug 01 2022 at 9:18 AM

Hi nickdb- there is no patten as it only happed 5 times , 2 on Friday load at +-600W lasted 7mins and 15mins

Early hours of this morning load at +-725W lasted 7s / 18min and 30mins +- .

the intervals between outages were about 30mins at max.

Yes when the grid "returns" everything acts normal .

Regards

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nickdb ♦♦ denzel commented · Aug 01 2022 at 9:34 AM

Just to clarify, this isn't about the load. You may well have an unstable grid at those moments, as happens here in SA with some regularity.

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denzel nickdb ♦♦ commented · Aug 01 2022 at 9:41 AM

certainly not load - i suspect it maybe grid related however at the time of testing maybe the grid was live but could have issues..... i will check the if there is power between N and E today as that maybe an issue too...

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Answer 2 · 2022-08-02T04:06:45Z

denzel answered · Aug 02 2022 at 4:06 AM

Update: I have checked the N - E voltage and they with in 1.9V . This morning again around the same time with no loads the system had a grid loss alarm again. 3 times. I now changed from "HUB-1" to an ESS mode to determine if this is related to a config issue.

Answer 3 · 2022-08-03T13:04:12Z

denzel answered · Aug 03 2022 at 1:04 PM

Hi Guys,

I found the issue relating to my grid loss problem. The was not on the Grid side but a setting on the Master Victron unit . The AC High Disconnect Voltage was set to 240V and my grid at time suppled 242V which then the Multiplus disconnected the AC until the Grid went down to 235V .

Had the Victron alarm alert reported something like "AC Input Volt High" instead in "Grid Loss" we would have found the issue much faster.

Still a very good feature to have .

"The setting is found under the Grid tab in VE Config"

@nickdb @Alexandra thank you very much for your assistants in this matter.

Regards

Denzel

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Grid Loss even thou the grid is available (Multiplus(s) in parallel)

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Grid Loss even thou the grid is available (Multiplus(s) in parallel)

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