Hi All, Recently Installed SunSynk 12Kw 3 Phase with 3 x Hubble AM-2 5.5 Kw Batteries. Plant running OK, but randomly get a 

55 - DC_VoltHigh_Fault

 

Have 2 strings attached 2 x 20 330 w Risen (Total of 40 Panels)

Any suggestions at this stage will be appreciated 

 

20 of those panels in series per string? If so, then that's too many.

Per string, (so only running 20 panels at the moment) disconnected the second string to check , ran ok for a week then started over the weekend again

 

45 minutes ago, DG87 said:

Have 2 strings attached 2 x 20 330 w Risen (Total of 40 Panels)

According to the specs

MPPT Range 140V~800V... Your panels have VOC of 42V

20 * 42 = 840V

With plenty of clouds (and the battery fully charged) I would expect this happening frequently.

Shorten your strings to 17 panels each (maybe 18 will also give good results)

Edited November 1, 20223 yr by iiznh

I don't think the F55 faulty is referring to the PV Panel voltage but rather your battery. 

I doubt very much your installer installed in a 20S configuration, probably 2P10S which would be around 420V which is spot on. If it was 20S you would probably have had melted MPPT's already 

I am assuming that you have a communication cable to your Hubble batteries, check in the BMS menu on your inverter and see what the voltages batteries are reporting. 

Hubble specs say Operating Voltage Range    40V-58.4V

 

 

 

11 minutes ago, Sc00bs said:

I don't think the F55 faulty is referring to the PV Panel voltage but rather your battery. 

I doubt very much your installer installed in a 20S configuration, probably 2P10S which would be around 420V which is spot on. If it was 20S you would probably have had melted MPPT's already 

I am assuming that you have a communication cable to your Hubble batteries, check in the BMS menu on your inverter and see what the voltages batteries are reporting. 

Hubble specs say Operating Voltage Range    40V-58.4V

2p10s will lose so much power on the one MPPT that is only 12.5A. The post above yours is a much better approach. I also think the F55 is indeed PV overvoltage.

Edited November 1, 20223 yr by P1000

Thanks iiznh, sounds good will give it a try

 

I think this is PV related because it only happens in the day time, no faults at night or afternoon's

1 minute ago, DG87 said:

I think this is PV related because it only happens in the day time, no faults at night or afternoon's

What, like when the battery is being charged maybe? 

 

 

To be fair, it could have been wired up either way as the Risen 330W PV's are

9 minutes ago, Sc00bs said:

What, like when the battery is being charged maybe? 

 

 

Does the F55 error come up when the MPPT goes over 800V and then just stop production?

Says in the spec PV Voltage range is 140V-1000V  

Still think a 2S10P configuration would have been closer to optimum for the MPPT (450V) than 820V. 

@P1000 What do you mean when you say it would loose power in a 2P10S vs 1P20S config? 

MPPT handles up to 25A and the Risen PV panels are Isc 9.3A & Voc 45.7V (I think) so either way would work.

If it is getting an error due to the PV voltage being to high you could just switch it to a 2P configuration and keep all the panels.  

10 minutes ago, Sc00bs said:

MPPT handles up to 25A

One MMPT does 25A, the other only 12.5A. So your config will work fine for the 25A MPPT, and run at a heavy loss on the other.

Ahhhh, ok, thanks for the explanation @P1000, that is really interesting makes sense. 

I was wondering what the 25A + 12.5A and 2 + 1 meant. 

Sunsynk-datasheet-88kw (5).pdf

I have notice that some of the 8kw spec sheets have the same thing in the spec sheet 

 

Sunsynk-datasheet-88kw (5).pdf

1 hour ago, Sc00bs said:

I have notice that some of the 8kw spec sheets have the same thing in the spec sheet 

 

 636.68 kB · 1 download

Ok, that's strange, it also has only 3 strings input. In this case I think it might be a limitation of the MC4 connector and is most likely enforced by the MPPT.

Agreed, is rather strange, only some of the 8kw specs say that though and my 8kw inverter definitely does more than 9A on both strings

10 hours ago, Sc00bs said:

Agreed, is rather strange, only some of the 8kw specs say that though and my 8kw inverter definitely does more than 9A on both strings

I think it only applies to inverters with 2 MPPTs, but 3 sets of MC4 inputs. I have not seen a 12kW with a different configuration, although I don't have a big sample size.

Ahhhh, that makes sense sort off

"The MC4 connector is UL rated at 20 A and 600 V maximum, depending on the conductor size used. Standards efforts in Europe also allow special 1000 V versions and 30 A or higher when used in pairs."

If that is the case, it is unfortunate that they would limit the PV production of the inverter because of the connectors. 

From Wikipedia - https://en.wikipedia.org/wiki/MC4_connector#:~:text=The MC4 connector is UL,on the conductor size used. 

Edited November 2, 20223 yr by Sc00bs

I have disconnect 4 panels from each string , so I now have 2 x 16 panels. The F55 fault has stopped, everything working fine.

Now I have 8 spare panels that are not being used.

Thanks everyone

5 hours ago, DG87 said:

I have disconnect 4 panels from each string , so I now have 2 x 16 panels. The F55 fault has stopped, everything working fine.

Now I have 8 spare panels that are not being used.

Thanks everyone

You could probably put those in parrallel 4 on each string, up the amps while maintaining the voltage. Have an overpanneled setup

@DG87Not sure what your roof looks like but if possible, I would convert the 25A string to a parallel string

So you will still have 1 x 1p16S on the 12.5A MPPT and then convert the other to a parallel string to take the extra panels 2P12S on the 25A MPPT. 

I am reviving the thread, as I have the same inverter with the same F55 DC_volthigh_fault that occurs randomly during the day (11h00 - 15h00), once a week or so.

On one MPPT I have 9 panels (Japan Solar 330W, Voc 46.4V), in series facing NE.

On the other MPPT I have 8 of the same in series facing NW.

This gives me a max voltage of 417.6V on one string and 371.2V on the other string. 

The panels are a few years old and a bit dirty, so the voltage output is considerably lower.

What I have noticed, is the error seems to occur in the middle of the day on cloudy days, where it is overcast, and suddenly the sun comes out.

Is it possible that the inverter glitches and cannot handle the sudden jump in voltage? Or is something else wrong?

 

 

I have the same sporadic F55 error on my Deye 8kw, I have reduced my PV to below 230 volts maximum and the issue still happens when the batteries are full. I am pretty sure it's battery voltage related and the fact I presently have no inverter communication with them. I am upgrading the bms so I can communicate and better control what is going on. Additionally, this only happens when the batteries are full and there is no load on them.

Anyone ever figures this out? We have 2 x12kw 3 phase inverters in parallel with 5 sunsynk batteries and 9x 545w panels on each inverter with a 405v average on both. But some days we will get about 15 of the f55 errors. I have also notes when i swtich off the panels breakers and it restarts i still get the same error.

Batteries are usually @50% and 53v