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Low active power on sunny...

Low active power on sunny days

Created: Jan 7, 2022 22:17:52Latest reply: Jan 17, 2022 11:39:33 356 17 1 0 0
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Hi, 

I have a strange problem with my newly installed system. On bright sunny days one of the two strings does not perform as I'd expect it. The DC voltage is going up to ~500+ V but the DC current is running at a maximum of 0.5ish A.

The other string is doing ok. 

On cloudy days both strings run pretty much fine.

I have to admit that my roof isn't perfect and the panels are in are in a -99/+81 azimuth setup mounted on frames with a 16degree angle. This could be part of the problem but I doubt it can really explain it.

The setup consists of 28 Longi 375W modules (2 Strings a 14 modules) with a SUN2000-10KTL-M1. 

I really struggle to understand what the problem could be. Is this config or hardware or anything else?

I'd really appreciate any hint.


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gzzz
Admin Created Jan 8, 2022 02:41:59

Hello, friend.

In your case, I suggest that you contact the PV Centre to design a perfect solution for you, to the point of maximising the active power, by sending an email to the following email address, describing your problem and attaching your SN number.

Europe Email: eu_inverter_support@huawei.com    

China and Asia Pacific: solarservice@huawei.com     

Latin America Email: la_inverter_support@huawei.com 

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OttoWeber
OttoWeber Created Jan 8, 2022 11:28:09 (0) (0)
I did so ... let's see what the answer may be.
Thanks so far!  
gzzz
gzzz Reply OttoWeber  Created Jan 8, 2022 14:45:32 (1) (0)
Hello, friend.
I trust you will receive an answer soon.  
OttoWeber
OttoWeber Reply OttoWeber  Created Jan 13, 2022 09:44:33 (0) (0)
As a first step I received new firmware for the inverter (SPC140) and the battery (SPC106). I need to wait for a sunny day now to see if there is any improvement.  
gzzz
gzzz Reply OttoWeber  Created Jan 13, 2022 15:49:16 (0) (0)
Hello, friend.
Good.  
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2#
AndresMoreno
AndresMoreno Admin Created Jan 7, 2022 22:18:13

Hello! Thank you for contacting us.
We are working on an answer for you.
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3#
gzzz
gzzz Admin Created Jan 8, 2022 02:41:59

Hello, friend.

In your case, I suggest that you contact the PV Centre to design a perfect solution for you, to the point of maximising the active power, by sending an email to the following email address, describing your problem and attaching your SN number.

Europe Email: eu_inverter_support@huawei.com    

China and Asia Pacific: solarservice@huawei.com     

Latin America Email: la_inverter_support@huawei.com 

View more
  • x
  • convention：

OttoWeber
OttoWeber Created Jan 8, 2022 11:28:09 (0) (0)
I did so ... let's see what the answer may be.
Thanks so far!  
gzzz
gzzz Reply OttoWeber  Created Jan 8, 2022 14:45:32 (1) (0)
Hello, friend.
I trust you will receive an answer soon.  
OttoWeber
OttoWeber Reply OttoWeber  Created Jan 13, 2022 09:44:33 (0) (0)
As a first step I received new firmware for the inverter (SPC140) and the battery (SPC106). I need to wait for a sunny day now to see if there is any improvement.  
gzzz
gzzz Reply OttoWeber  Created Jan 13, 2022 15:49:16 (0) (0)
Hello, friend.
Good.  
(0) (0)
4#
Unicef
Unicef MVE Created Jan 8, 2022 14:47:34

COOL
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5#
Tang_li
Tang_li Admin Created Jan 11, 2022 06:43:00

Check whether there is a power limit setting or blocking in sunny days. I think it's a blocking problem.

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OttoWeber
OttoWeber Created Jan 12, 2022 08:44:45 (1) (0)
Hi Tang_li,

I did check the settings but did not find anything obvious. Which settings would you think could explain such a behaviour?

Kind regards  
(1) (0)
6#
OttoWeber
OttoWeber Created Jan 13, 2022 19:00:45

Ok - today was a nice day as it was pretty foggy in the morning but became a bright sunny day after noon. It looks like the inverter is not having a problem but rather the modules or the overall setup is poor. As soon as I get bright sun one string is reducing the current, instead of increasing. This is really odd. (no comments on my "artwork" please :-))

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Tang_li
Tang_li Created Jan 17, 2022 01:32:09 (1) (0)
Are you sure the photovoltaic panels on site are not blocked?I think PV2 is probably blocked.On a cloudy day, PV1, and PV2 have the same light.When sunlight comes out, the shadow blocks the PV2 panel.  
OttoWeber
OttoWeber Reply Tang_li  Created Jan 17, 2022 11:31:20 (1) (0)
This is my suspicion too but neither a simulation nor observation would proof such a significant drop in my opinion. I am in contact with the installer too, of course to assess whether their design is really the design I need for my roof. I will attach a picture of the roof later.  
(2) (0)
7#
OttoWeber
OttoWeber Created Jan 17, 2022 11:39:33

@Tang_li would you think that that string 1 (left hand side) do block string 2 in a way that it could explain the signifigant drop? I do not expect that string 2 would deliver the same power but what they do is almost nothing.
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gzzz
gzzz Created Jan 17, 2022 12:53:49 (1) (0)
Hello, friend.
You can't see anything based on the picture, the most effective and direct way is to suggest that you seek the help of a PV center to locate the cause. Send an email to the following email address, describing your problem and attaching your SN number.
Europe Email: eu_inverter_support@huawei.com
China and Asia Pacific: solarservice@huawei.com
Latin America: Email: la_inverter_support@huawei.com  
Tang_li
Tang_li Created Jan 18, 2022 01:18:50 (1) (0)
You can switch PV1 to the PV2 port on the inverter,
Switch the original PV2 port to the PV1 port on the inverter.
Check whether the PV string is changed after the PV string is replaced.If it is moved, the problem is on the pv.  
OttoWeber
OttoWeber Reply Tang_li  Created Jan 18, 2022 15:05:41 (0) (0)
Hi - I did so and the problem moved ... hence the inverter is fine and it is the PV.  
Tang_li
Tang_li Reply OttoWeber  Created Jan 19, 2022 01:02:37 (0) (0)
OK, check the PV. I guess string 1 (left-hand side) was the one input to inverter PV 2 port before  
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