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[Sticky] Solar Power Output – Let’s Compare Generation Figures

 
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Solar Photovoltaic (PV)
Last Post by Transparent 14 hours ago
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 Andris
(@andris)
Reputable Member Member
1284 kWhs
Joined: 4 years ago
Posts: 107
03/04/2025 9:59 am  

@irmartini That looks great! What is your set up look like?

16kw Samsung TDM ASHP. 8.4kw PV, power optimizers 20×420watt panels 6kw SolarEdge inverter.


   
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 IRMartini
(@irmartini)
Estimable Member Member
1429 kWhs
Joined: 12 months ago
Posts: 72
03/04/2025 10:18 am  

@andris 

Its a 11.4 kW array

28x 400W panels 

14x WSW (front)

14x ENE (Rear with shading so these panels have optimisers)

They feed 2x 5kW inverters (each has a 7x panel string from the front and rear so the inverters are balanced)

“Anything worth doing, is worth doing right.”


   
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Transparent
 Transparent
(@transparent)
Illustrious Member Moderator
13428 kWhs
Joined: 3 years ago
Posts: 2347
03/04/2025 10:32 am  
MPPT 13 44c

Does anyone else here actually monitor the incoming solar?
Or are you all happy to report what the inverter says it's handled?

I mention this because I had one inverter with a faulty MPPT input.
MPPT = Maximum Power Point Tracking

It would go through bouts of 'forgetting' how much current to draw from the panels.
Ie it was no longer able to find the knee of the curve where maximum power was achieved.

MPPTgraph

 

That resulted in a self-imposed reset.
The current dropped to zero, and the MPPT algorithm re-started.

This video clip shows two such MPPT resets in close succession.

I was probably losing 5% to 15% of power input to that particular inverter, depending on how many resets there were in a day.

This post was modified 18 hours ago by Transparent

Save energy... recycle electrons!


   
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 IRMartini
(@irmartini)
Estimable Member Member
1429 kWhs
Joined: 12 months ago
Posts: 72
03/04/2025 10:41 am  

@transparent 

I have no way of monitoring that or rather I don't know how to or what would be required to and so reply on what my inverters report.

However as they are new and so assuming they working fine so far, I have lots of graphs and totals right from install I would like to think I could spot an issue like that over time. (hopfully 🤔 ) 

“Anything worth doing, is worth doing right.”


   
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Mars
 Mars
(@editor)
Illustrious Member Admin
27536 kWhs
Joined: 4 years ago
Posts: 3083
Topic starter 03/04/2025 12:01 pm  

Posted by: @transparent
↑

Or are you all happy to report what the inverter says it's handled?

Solely believe the SolarEdge app.

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Transparent
 Transparent
(@transparent)
Illustrious Member Moderator
13428 kWhs
Joined: 3 years ago
Posts: 2347
03/04/2025 2:48 pm  

That's fine @irmartini and @editor
but let's keep this issue in mind for the future.

If we get someone arriving here on the Forum who says their inverter(s) are reporting less output than their solar arrays should be capable of,
then a faulty MPPT input port is a possibility.

In my case that inverter was new. 😥 

A DC Energy-Meter like this costs about £10 from China incl VAT & shipping

image

or £23 from Amazon UK.

I can assist with installation guidance if anyone here wants it.

This post was modified 14 hours ago by Transparent

Save energy... recycle electrons!


   
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