Installer Configuration mistakes - does it matter?

5starpool · 06-05-2025 12:20PM #1

Hi,

Last year I got a 14 panel system (6 x 430w east facing, 8 x 430w west facing) installed, but yesterday when perusing through some of the settings on the app noticed that they have 2 x 6 panels string with a capacity of 2.58kW specified as configured, whereas it should be one of 2.58 kW and one of 3.44kW. Does this matter? It's a Huawei SUN2000-5KTL inverter, so using the FusionSolar app. Overall it says total string capacity of 5.16 kW, which again should be 6.02kW.

Maybe I'm paranoid, but I think my output is a little low, but I put that down to the East/West orientation. My output yesterday for example was 28.77 kWh. Sun (in the east a little north east of Dublin city) was in and out a bit in the morning, bit gloriously sunny most of the day.

Even last year there was only 1 day where I generated over 35kW, and 15 days between this and last where I generated over 30kW. Does this sound about right or could there be 2 panels that aren't configured properly at all so not generating? Is there any possible way I could tell short of going on the roof and covering them one by one to see what happens (which I am certainly not going to do).

Thanks for any help.

10-10-20 · 06-05-2025 02:33PM

At a guess that's just the sizing for the app and it likely doesn't have any effect on the inverter as MPPT input will calculate the best voltage/current curve on the basis of what it sees.

As for evaluating the generation, it would be best to input the panel data into the Euro JRC calculator and work it out by way of an average.

https://pvgis.com/en

Edit, wrong link, this is the correct one:

https://re.jrc.ec.europa.eu/pvg_tools/en/