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As requested, here is an update. A very efficient electrician arrived at 08:15 today to connect the second string. I made him coffee and explained the existing set-up and how I wanted the system configuring, based on what I’d learnt from this forum and trawling through the internet. He agreed...

Thank you Andy. I can see the second page you have posted, but cannot find the first page. Not sure whether it’s the version I have, which I downloaded from the AppStore last month. It’s a pity that I can’t get the first page because it displays some really useful information. I’ll keep trying.

Yes, they correspond exactly with where the four panel string is positioned. I’ve left the cables well alone, even though the chaps that fitted the panels taped-up the cable ends. The installer is sending an electrician this Thursday. Thanks again Binky.

Hmmm. Don’t know about the installer, but I’m more than happy to.

Thanks MHarv, there are two pairs (see image) labelled DC1 and DC2, so looks like it has dual MPPT as per the spec sheet.

Hello Bob. Keeping an open mind is always good advice. Our inverter’s spec is dual MPPT, so hopefully option one does not apply (see attached image). There is no evidence of any connection from the other string to the cables leading from the ‘working’ string. I can trace this string’s cables...

Bob, Binky and all of the others who have helped, thank you. You might be interested to know that I undertook a thorough search of our loft space this morning, hoping, but expecting, to trace the panel wiring further. The attached images shows what I found. It appears that the string of four...

Thank you both Binky and Bob for your continued advice. The video you attached, Binky, is excellent and explains the principle behind MPPT function really well. There’s one point that’s become slightly confused as this thread has progressed, in that, our panels face south and south south east (...

I only have the one DC switch Bob, with the two cables feeding in and out of it. There is an app I use for monitoring the system/inverter performance called Soliscloud. There is nothing in the app indicating that the two sets of panels can be monitored independently.

Thank you for your really useful comments Joules. I interrogated the inverter as you suggested and have attached images of the first two items on the scrolling information list. The first shows a voltage of 167.0V and 0.2A. The second line on the list displayed a voltage of 1.6V and 0.1A. Lines...

Thanks Bob. Interesting to compare your output for the month so far. It is higher than ours, but if I recall correctly, we did have two or three days of misty weather at the beginning of the month. As you suggest, the gloomy south-west weather could be delaying start-up.

Thank you Binky. There is a bit of a theme developing here regarding start-up. Responses from this forum are helping to make sense of our observation regarding comparative outputs from that of our system and the nearby larger system. I’ll check the string voltages as you suggest. Thanks again.

Thank you Bladerunnerpv, that’s interesting. We are good friends with the owners of the larger installation, so comparing start-up times is achievable.

As a matter interest, how many kWh do you generate from your system in July?

Thank you for your reply, that’s helpful. Based on my limited data I’m going to have bash at estimating annual production taking into account daylight hours and average monthly irradiation values. May be a waste of time, but might give me an idea whether the system will deliver what was stated...

Hello. I am hoping that somebody can help me with this conundrum. Our recently installed 4kW PV system comprises six panels positioned on a section of the roof facing south and a further four panels on an adjacent section facing south south east. Our irradiation level is 962, roof pitch 45...