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Number of panels per string

Created: Jul 20, 2020 08:06:50Latest reply: Aug 11, 2020 00:44:05 598 5 0 0 0
  Rewarded HiCoins: 0 (problem resolved)

What is the general advice and best practice regarding number off panels per string.


We have a scenario with 2 opposite roofs (30 deg angle). The inverter is SUN2000-15KTL


Configuration:

Roof A

String 1: 16 panels

String 2: 12 panels

Roof B

String 3: 12 panels

String 4: 14 panels


Is that conffiguration ok or is it a risk for unbalance in the system?

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BetterMing
Created Jul 20, 2020 08:29:08

Hello, Erhug.

You can refer to the following picture data.

SUN2000-15KTL

What you need to note is that the number of panels under each MPPT must be the same. Input ports 1 and 2 are 1MPPT. The 3 and 4 input ports are 2MPPT. So you need to reduce two panels for Roof A.

And you need each string voltage to be less than the maximum input voltage of the inverter.

Thanks!

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  • x
  • convention:

Tang_li
Tang_li Created Jul 20, 2020 08:37:02 (0) (0)
4 string of this inverter :the input voltage must under 1080, the NO.of string 1,2(same mppt) or 3,4(same mppt) must equate  
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Hello, dear!
It's nice to meet you in the community.
We're working on your problem. Please be patient.
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  • x
  • convention:

Hello, Erhug.

You can refer to the following picture data.

SUN2000-15KTL

What you need to note is that the number of panels under each MPPT must be the same. Input ports 1 and 2 are 1MPPT. The 3 and 4 input ports are 2MPPT. So you need to reduce two panels for Roof A.

And you need each string voltage to be less than the maximum input voltage of the inverter.

Thanks!

View more
  • x
  • convention:

Tang_li
Tang_li Created Jul 20, 2020 08:37:02 (0) (0)
4 string of this inverter :the input voltage must under 1080, the NO.of string 1,2(same mppt) or 3,4(same mppt) must equate  
An option is to use optimizers (think this inverter can use them). This mitigates the issue with the differences in the number of panels, shading, irradiation, and even types of panels.

The optimizer would balance out the currents between the different strings and voltages so that the panels and inverter are working at their optimum.
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  • x
  • convention:

Roof A

String 1: 14 panels

String 2: 14 panels

Roof B

String 3: 13 panels

String 4: 13 panels
View more
  • x
  • convention:

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