PVGIS is more than just geometry,sharpener wrote: ↑Thu Mar 13, 2025 3:45 pm PVGIS enables you to predict generation by site/orientation/pitch, I don't know the underlying theory exactly but I think it is based on geometry not measurement. Solcast makes short term predictions based on weather forecast, Victron use it in their adaptive ESS algorithm but ATM I have got it turned off.
Let us know what it puts out close to midday on a decent unshaded day? Congratulations BTW.Richard77 wrote: ↑Thu Mar 13, 2025 10:02 amThanks Countrypaul...Countrypaul wrote: ↑Thu Mar 13, 2025 9:23 am You would normally expect a 2.58kWp array to produce upto 2.58kW. The temperature of the panels would have to be as specified in the panel documentation and the insolation usially 1kW/m2. If the weather is very cold then you might get slightly more, if very warm less - again the panel documentation should give you an idea of temperature degradation.
Getting 663W out of a 2.58kW array looks like it gives you the 25.7% figure you are seeing.
I was thinking (wrongly I suppose) that as the solar panels efficiency is around 23% I would only be able to generate 23% of the 2.58kw
So if everything is perfect I should be able to generate the full 2.58kw (never going to be perfect in NW England though!)?
That's pretty good. You should see system peak in May before cell heat itself becomes a variable. If I was getting close to 50% across the board at this time of year I'd be happy.Richard77 wrote: ↑Thu Mar 13, 2025 4:42 pm Cheers Joeboy
It was getting 1257w max today around midday. It was pretty clear and sunny at times today.
Unsure if the tigos are working as they should though as it seems to have plummeted as soon as a bit of shading. I don't actually know what the optimiser is supposed to do so will have to have a Google it hehe.
Shame can't put batteries in yet though, as garage doors aren't going in til April 8th... Don't fancy someone wheeling them away!
They are 1 string with 4x 645w aiko panels (hopefully... Can't find a model number on them!) in series. I thought it would be best to do that otherwise the startup voltage would be too low if just 2x panels. So I suggested doing that to the installer. Again...I can only assume that's what was done.Joeboy wrote: ↑Thu Mar 13, 2025 4:51 pmThat's pretty good. You should see system peak in May before heat itself becomes a variable. If I was getting close to 50% across the board at this time of year I'd be happy.Richard77 wrote: ↑Thu Mar 13, 2025 4:42 pm Cheers Joeboy
It was getting 1257w max today around midday. It was pretty clear and sunny at times today.
Unsure if the tigos are working as they should though as it seems to have plummeted as soon as a bit of shading. I don't actually know what the optimiser is supposed to do so will have to have a Google it hehe.
Shame can't put batteries in yet though, as garage doors aren't going in til April 8th... Don't fancy someone wheeling them away!
Are they two strings of two in series as a set up?
I couldn't find anything in the menus for each individual panel (SunSynk connect)... Just how much they all generate together.Joeboy wrote: ↑Thu Mar 13, 2025 5:23 pm Sounds good. I have solaredge optimisers on one of the set ups and the panels do vary. As you'll be able to see all four panel outputs (I hope) in your software. Keep an eye out for one dropping when shaded and the other three output remaining high.
If one panel is shaded and all drop to the same value then you'll want to look into that. Don't freak out, I'm sure all 4 panels are doing their independent thing but worth confirming?
Our W/E system at 5.12kW produced 10.7kWh. That's the one with optimisers on. The other system that is very close to being the same size (5.12kW) has a Southerly heading (mostly) and it kicked out 14.75kW. This indicates to me that HP matters which is orientation.
