Is My Solar Panel Setup Efficient?

0
Asked By SunnyDays123 On

Hey everyone! I have a total of 52 solar modules with a capacity of 23.66 kWp, specifically the Trina 455W Vertex S+. My roof has a 20-degree angle, and I've configured the modules as follows: 27 modules placed South-west (225 degrees) and 25 modules North-east (45 degrees). I'm using a Fronius Verto Plus inverter rated for 20 kWp with 3 MPPs, each having 2 DC inputs. Here's how I've laid out the strings:

- MPP1: 2 strings of 9 modules facing South
- MPP2: 2 strings of 9 modules (1 string of 9 South parallel with 1 string of 9 North)
- MPP3: 1 string of 16 modules facing North

I'm wondering if this string layout is okay as it is, or if I would face significant losses. I'm aware that if I were to set it up again, I would prefer to go with longer strings (like 1x17, 2x10, 1x15). However, since the wiring is already done on the roof, I'd like to know if I should stick with this current setup or make adjustments. Thanks for any insight!

1 Answer

Answered By GreenThumb202 On

For your setup, I'd recommend dedicating MPPT1 and MPPT2 specifically for the 27 modules that are facing South-west. You could set MPPT1 to handle 1 string of 14 modules and MPPT2 for 1 string of 13 modules. For MPPT3, you should connect it to the 25 North-east modules, maybe split them into 1 string of 12 and another of 12, while leaving one panel unconnected or ideally adding another with the same orientation. This way, you can maximize efficiency based on your current layout.

SunnyDays123 -

Thanks for the suggestion! I get that those configurations might be the most efficient. My main concern is, how much loss do you think I'll face if I keep the wiring as it is right now?

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