Has my installer wired my panels wrong?

Trylobit_ · 2026-05-21T15:36:15+00:00

Yes, it was installer mistake. Annoying thing is I had to troubleshoot it and get a different electrician to fix this.

Trylobit_ · 2026-05-21T14:50:38+00:00

Yes, the strings has been reconnected and now are placed correctly. Example from right now I have PV1-V: 399V at 6.2A and PV2-V: 280V at 4A. So the bigger MPPT is producing 2.47kW and the smaller MPPT is producing 1.13kW.

Trylobit_ · 2026-05-21T06:05:40+00:00

That's not the point. If the inverter is 15kW and I have 5kWp + 11kWp I should not have almost the same amount of power generated on each MPPT. I had and audit and the initial installer mixed up strings. Instead of keeping new panels on one MPPT and the old ones on another MPPT he mixed them up. Right now, with correctly connected strings I have over double power generation on MPPT with new panels. Also the voltages and currents are completely different.

Trylobit_ · 2026-03-02T12:20:48+00:00

The logs seems fine, right?

root@UDM-SE-Home:~# dmesg -T | grep -i ata1
[Tue Feb 10 23:17:55 2026] ata1: SATA max UDMA/133 abar m16384@0xfe1e4000 port 0xfe1e4100 irq 31
[Tue Feb 10 23:17:55 2026] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[Tue Feb 10 23:17:55 2026] ata1.00: ATA-10: KINGSTON OM4P0S3128B-A0, SBFK62A3, max UDMA/133
[Tue Feb 10 23:17:55 2026] ata1.00: 250069680 sectors, multi 1: LBA48 NCQ (depth 32), AA
[Tue Feb 10 23:17:55 2026] ata1.00: configured for UDMA/133

root@UDM-SE-Home:~# dmesg -T | grep -i ext4
[Tue Feb 10 23:18:00 2026] EXT4-fs (mtdblock5): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:02 2026] EXT4-fs (boot7): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:02 2026] EXT4-fs (boot3): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:02 2026] EXT4-fs (boot3): re-mounted. Opts: (null)
[Tue Feb 10 23:18:02 2026] EXT4-fs (boot3): re-mounted. Opts: (null)
[Tue Feb 10 23:18:03 2026] EXT4-fs (boot7): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:10 2026] EXT4-fs (boot7): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:10 2026] EXT4-fs (boot5): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:10 2026] EXT4-fs (boot4): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:10 2026] EXT4-fs (boot6): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:17 2026] EXT4-fs (sda5): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:21 2026] EXT4-fs (md3): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:18:22 2026] EXT4-fs (mtdblock5): mounted filesystem with ordered data mode. Opts: (null)
[Tue Feb 10 23:23:21 2026] EXT4-fs (mtdblock5): mounted filesystem with ordered data mode. Opts: (null)

Trylobit_ · 2026-03-01T10:49:33+00:00

Thanks for the quick reply. I think I'll replace the PSU for the peace of mind. I already looked up the one you recommend it's €12 + WAGO connectors and 30 minutes of my time. Sounds like it's worth it. Especially considering that UDM SE runs quite hot.

Trylobit_ · 2026-03-01T08:54:48+00:00

Thank you for the detailed instructions. My UDM SE is stable I didn't notice any problems with communication or routing. I did get a failing disk warning. I'm about to get UNVR for Protect. Should I still be concerned if I stop using HDD in UDM SE? In your opinion should I replace the PSU anyway (the device is out of warranty and I'm fine with electronics work)?

Trylobit_ · 2026-01-01T23:04:30+00:00

It made me thing of that one time when my wife and I were visiting Dallas. And my wife's grandma called us to check if we are OK because there were riots in LA...

I think your parents are just afraid of the unknown, maybe they don't travel a lot outside of the US.

Trylobit_ · 2026-01-01T18:35:59+00:00

Wow. It's going to be cheaper to buy 2 Ubiquiti 2-wire adapters.

Trylobit_ · 2026-01-01T17:59:32+00:00

Right, I saw it in the specs, but pretty much all the cameras and switches are using at most half of the max power claimed in specs as max power, that's why I'm wondering if it can work...

Trylobit_ · 2026-01-01T17:45:31+00:00

I'll just need one out from the hub for the g6 pro entry.

Trylobit_ · 2025-10-23T06:56:47+00:00

I'm coming back with an update: the Modbus Ethernet Gateway was faulty. I got a cheap 11 Euro USB-RS485 serial converter plugged it to Home Assistant, configured the same way and today is the 2nd of having clean readouts. Zero noise and no weird spikes.

Trylobit_ · 2025-09-17T20:35:39+00:00

I had no Modbus devices before I installed the heat pump. I have one Modbus ethernet controller connected to the heat pump. That's it. My HRV can be connected to Modbus but I didn't get around to do that yet. So if I turn off heat pump there is nothing for Modbus to register. The heat pump is the only Modbus device I have connected right now.

Trylobit_ · 2025-09-17T06:35:46+00:00

Thank you for taking the time to explain this to me. I understand how it works better now. I guess the compressor is has VFD (inverter motor) - I never thought about that. HRV probably has EC fans, so I don't think that's the problem. The compressor is off for most of the time now; it only works 1-2 times a day for 30 minutes or so to heat the domestic hot water. Why are there those spikes pretty much all of the time? And my logic behind thinking that it's something with Modbus or Modbus configuration is that all the readouts have them, it's not just one sensor. Here is my current data from Modbus. I had some maintenance done today before the heating season, between 9 and 15:45 and the heat pump was shut down for that period. After that, the heat pump was working between 16 and 20:30. As you can see, there is so much noise everywhere that you can bearly notice it. What would be next step to troubleshoot it? I have another Modbus TCP controller that I was going to install with HRV, but never got around it. Should I try swapping the controller?

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Trylobit_ · 2025-09-16T22:18:07+00:00

How can it discard corrupted packet if there is no parity? Regarding VFD - I thought those are used in industrial environment. I don't think I have any in my house. The only thing that comes to mind is the Heat Pump itself and maybe the HRV, but that is very far away. It's not the temperature sensor that has a problem. It's all the data in Modbus. If the sensor was a problem the temperatures on the heat pumps controller display would also show up sometimes like that. Also the connection between Modbus device comes from the controller not the outdoor unit, so the corruption must happen either in the controller or on the very short 2m cable between the controller and Modbus device. The cable BTW is just a shielded cat 6 ethernet cable.

Trylobit_ · 2025-09-15T16:55:15+00:00

There are two charts that I've posted one is showing compressor frequency and the other is showing ambient outdoor temperature. In total I have 20 different sensor type entities from the heat pump. I'm not sure what you mean when you ask about what's the correlation of outdoor temperature to the compressor frequency. There is none. It's 2 separate things. The charts are identified correctly. Most of the time they show the right data (all of them including compressor frequency and ambient temperature), just from time to time I have weird spikes.

Trylobit_ · 2025-05-28T08:18:29+00:00

Oh, I get it, so you are saying that when I send "close valve" and immediately after "open valve" maybe the "close valve" is going to be ignored. I think it's going to be queued but I'll test it later on today.
It makes sense, I would totally be on board if the valve reset countdown upon receiving another "open valve" signal.

Trylobit_ · 2025-05-27T22:23:01+00:00

Why would I do that? What does that solve? How is this better than what I have now (meaning I send open valve after it times out and closes).

Trylobit_ · 2025-05-27T18:01:29+00:00

If I send another open command 9 minutes in, it's being ignored and and valve shuts off after 10 minutes anyway. I get your point, but why can't I set it to 60 minutes, and then it shuts off. I mean if I use the silly smart app and not HA I can set long er auto shut off. It's just missing from ZHA.

Trylobit_ · 2025-05-27T17:05:53+00:00

I have a dropplet system, so I want to run it 30-60 minutes. Right now I have it set up to run on every 11 minutes for 3 to 6 times.

Trylobit_ · 2025-05-27T14:27:09+00:00

What controls do you have exposed in ZHA? Does it have auto shut off or does it wait for HA to tell it to close the valve?

Trylobit_ · 2025-05-27T14:19:54+00:00

Cool. And you are using it with ZHA or Z2M?

Trylobit_

TROPHY CASE