BigDee Solar

Thanks - one site was installed in March of 2021. The other one, with similar issues, is from June 2021.

Hi,

I have an installation (on one of my customers' sites) of 2 X Axpert 5NB (Mecer) inverters. They are connected to two strings (344Voc and 258Voc) and 6 X US3000 Pylontechs. From time to time (random) the inverters trip (milliseconds), and loses their settings. So, they would go from 230VAC to 220VAC, 50Hz to 60Hz, but most problematic, the battery settings go from USE to FLD and the voltage from 53.0V to 58.4V. The latter is obviously deadly to the battery BMSs, and we have fried two of them already. Mustek shrugs their shoulders, and also sent me 71.92 firmware "to try and address the issue".

The inverters show no error codes, simply flashes and restarts immediately.

Has anyone else found similar random trips on their systems?

Hi, I have been following this discussion for a long time. Now, I am also a "victim"...

I have 3 Axpert 5NB PF1 (Mecer brand) inverters, which have been running fine for at least two years. They are connected to three strings of 397V, 397V and 270V panel configs. Last week, I added three more panels to the low string, which now runs at 390V. Since this upgrade (did not touch anything inside), I get error 72 whenever my batteries (12 X US3000 Pylon) gets to 100%SoC. I run ICC monitoring software, and you can see when the green solar line dips from around 10kW to load wattage, the one inverter (always #2) errors. At this time, my LED lights in the house also go crazy and you can see serious jitter on the output voltage of the inverter.

I spoke to Mustek, who sent me new firmware (71.92) - which I will flash later. I am running 71.86 at the moment.

On 2021/03/17 at 9:31 AM, Bouts said:

Good morning to you,

I'm new to the forum and need help please. I have a 5Kva Mecer inverter and a US3000 Pylontech with an ICC. I added another pylon tech but it's a US3000C. The US3000C is the master and all the connections are done correctly as specified. The US3000's Link Port 0 goes to the US3000C's Link Port 1 and the ICC is in the Console Port. The US3000C goes into protection mode at least once a day and then switches off. Is the US3000 and the US3000C compatible with each other? Furthermore, the ICC also does not show the US3000 battery, but only the US3000C.
Can anyone give me advice please?

Hi, not sure if your issue was ever fixed? There was a problem with the firmware of the 3000C batteries. I had LONG meetings and fights with Pylontech directly. They fixed the firmware a month ago...

You need to flash the batteries with V1.9 - all issues should be fixed then.

Hi Shadders, how did you download the info from the inverter? Dennis.

On 2021/02/19 at 9:16 AM, Tubby said:

Hi Guys

Jaco have you heard back or is your issue sorted?

I recently added two US3000C's to my existing four US3000 PylonTechs and balanced them as instructed. I made the new US3000C's master and number two. All seems to charge normal on ac or PV. Discharge through the night is normal until sunrise when PV kicks in, the master goes into protection with solid red light. I swopped master and number two around, making number two now master, but same thing happens at sunrise. ICC reads all normal with the exception of cycles on the older batteries as I was informed firmware needs to be changed (No idea how to do this either).

Does anybody have an idea what is causing this alarm/protection or how to solve it?

Many Thanks

I think the US3000C batteries have some issues... I have a standalone system with two US3000Cs. They work fine during the day, but the BMS alarms when discharging. The draw is only around 400W at night. When discharged to 60%, the BMS alarms. I reported this to Segen, and was told they have many 3000Cs being returned. They now need to replace some internal card on the one...

On 2020/02/20 at 8:12 AM, SiliconKid said:

Growatt SPF 5000TL HVM 5kVA/5kW Hybrid Inverter

So far, so good.

Now that I've got BMS comms working properly I'm pretty impressed with it, but I'm waiting for more load shedding to kick in so that I can monitor the performance properly.

I'm also hooking up a Raspberry Pi this week so that I can monitor both the inverter and batteries more effectively, and then I'll probably report back to these forums with more detailed info on performance and efficiencies.

 

Hi, Which Inverter do you select on the PI, as it does not have the GroWatt on the list?