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Adding 5 More Panels to My Growatt Inverter – Second String Questions on Specs, Cabling & Configuration

 
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Solar Photovoltaic (PV)
Last Post by Transparent 52 minutes ago
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Transparent
 Transparent
(@transparent)
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Joined: 4 years ago
Posts: 3141
16/04/2026 6:46 pm  

Positioning PV panels horizontally flat isn't recommended.

They need to be at an angle sufficient to allow rain to wash them clean.

There's a static electricity attraction between the top glass layer and air-borne dust particles. It's worse than you'd expect because the electrical activity of the silicon wafers and their interconnecting foil tracks keeps the glass 'charged'.

Commercial solar-farms usually carry out an annual cleaning regime, even though their PVC panels are tilted at around 35°, and the aluminium frames are earthed to help reduce static attraction.


Save energy... recycle electrons!


   
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 David999
(@david999)
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Joined: 2 years ago
Posts: 315
Topic starter 16/04/2026 7:07 pm  

@transparent I need to think this out carefully, my first choice is tubs and at 100kg and screwed to the roof joists I doubt they would move.  In terms of the roof coming off I think all that weight should keep it down. And as mentioned fit joist clips to the internal walls although one side had units on that wall so will need to modify them if that’s the route.  It’s solid brick walls but the joists are sat on the wall and could lift off but those joists are beasts and the weight of the tubs surely would not allow that.

image

 

i



   
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Transparent
 Transparent
(@transparent)
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Joined: 4 years ago
Posts: 3141
16/04/2026 8:03 pm  

Having seen that latest photo, I'm inclined to agree with your strategy.

I can't see how you could fit any additional packing beneath the raised portions of the corrugated sheets.
There's no access.

So your better strategy is to simply ensure that load from the the five tubs are spread across the underlying beams.


Save energy... recycle electrons!


   
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