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Cleaning solar panels

 
Solar Photovoltaic (PV)
Last Post by colinc 33 minutes ago
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 AndrewJ
(@andrewj)
Reputable Member Member
Joined: 1 year ago
Posts: 206
Topic starter 06/05/2026 11:55 am   [#2985]

I asked Watson this question but it came up with very few, not very relevant results and I'd be amazed if this question hasn't been asked before.  I have 20 panels split pretty evenly between an East-West pitched roof and they've been up a year.  If I Google this the answer, of course, varies from "never" to "twice a year" (that from the companies who charge!.)  Here in the UK we get a reasonable amount of rain.  I'm not good with heights and definitely won't be getting on the roof myself, however I don't mind a step ladder.  Getting a professional company to do it will obviously come with a charge which could well negate much of the savings from having them in the first place.  So I guess the questions are is it worth it, is self cleaning enough; and how frequently?



   
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 David999
(@david999)
Reputable Member Member
Joined: 2 years ago
Posts: 332
06/05/2026 11:57 am  

Posted by: @andrewj
↑

I asked Watson this question but it came up with very few, not very relevant results and I'd be amazed if this question hasn't been asked before.  I have 20 panels split pretty evenly between an East-West pitched roof and they've been up a year.  If I Google this the answer, of course, varies from "never" to "twice a year" (that from the companies who charge!.)  Here in the UK we get a reasonable amount of rain.  I'm not good with heights and definitely won't be getting on the roof myself, however I don't mind a step ladder.  Getting a professional company to do it will obviously come with a charge which could well negate much of the savings from having them in the first place.  So I guess the questions are is it worth it, is self cleaning enough; and how frequently?



   
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 David999
(@david999)
Reputable Member Member
Joined: 2 years ago
Posts: 332
06/05/2026 12:00 pm  

Posted by: @david999
↑

Posted by: @andrewj
↑

I asked Watson this question but it came up with very few, not very relevant results and I'd be amazed if this question hasn't been asked before.  I have 20 panels split pretty evenly between an East-West pitched roof and they've been up a year.  If I Google this the answer, of course, varies from "never" to "twice a year" (that from the companies who charge!.)  Here in the UK we get a reasonable amount of rain.  I'm not good with heights and definitely won't be getting on the roof myself, however I don't mind a step ladder.  Getting a professional company to do it will obviously come with a charge which could well negate much of the savings from having them in the first place.  So I guess the questions are is it worth it, is self cleaning enough; and how frequently?

I clean mine a couple of times a year, they do get dirty. At the moment the farmers are working in the fields and it’s all laying on the panels. It’s surprising how dirty they get and only when you run a cloth over them do you see how bad.  A bit like windows I guess they look ok until the sun whiles on them 

 



   
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 colinc
(@colinc)
Eminent Member Member
Joined: 7 months ago
Posts: 30
06/05/2026 12:25 pm  

@david999 ... just water, David, or do you add anything to it ?

When were your panels installed please?


Aika 480v PV, Sigenstor Batteries & Inverter
Viessmann Vitocal ASHP, Oso Geo DHW


   
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