Clean the solar system yourself regularly?

Definitely invest more money and do something decent with it. On principle alone, buying Chinese modules is out of the question, even if they are cheaper. But I occasionally deal with China for our small business and get sold junk every day.

What should also be considered is a way to switch off... like a fuse, etc., between the cells on the roof and the system downstairs.

But here it's about the cleaning; I read on one site and saw a measurement protocol that up to 26% more performance could be achieved from a system (cell) that was treated with a nano-sealant compared to a non-sealed one.

@Moderation: Sorry for the link, I didn’t know it was already considered "unauthorized advertising." I run a forum myself with 7,500 people, but I’m not that strict there either. But you have the right to enforce rules. Apologies again.

Hello M&K

Well, I simply cannot imagine the 26%. Revenue increases of 1-2% are almost worth sensational headlines. Maybe in the lab with a lot of money spent, but not on real plants at an economical price.

But if you have a link to that, you can gladly send it to me via PM.

Regards Micha

Oh, how wonderful is percentage calculation. Everyone has a few percentage numbers and all can be correct because everyone has a different base.

I assume that M&K meant the efficiency of a dirty photovoltaic system in relation to a clean photovoltaic system. Near a brown coal surface mine, that might be about right.

And Micha will be assuming the overall efficiency.

On Wikipedia, it says something around 13% efficiency. A 26% deterioration would mean a 3% difference in efficiency, so not that far off from the 1-2%.

I would have to read that again, but I think that was a comparison between a cleaned and then sealed system and a dirty system.

Hello

I did not expect that someone would compare a dirty system with a sealed one...

There are two different effects (dirt, sealing) and you cannot assign how many percent come from the cleaning and how many from the sealing...

But I have not come across a system that - when dirty - delivers 20-26% less performance...
My experience (Attention!: My experience - not universally valid!) is that a dirty system delivers about 5-6% less yield... And these are the heavily soiled systems...

If the system is really heavily soiled, then cleaning is worthwhile - that is clear. But then you can also see that with the naked eye from a distance.
The "normal case" - private rooftop system in the city - does not need to be cleaned. The rain takes care of that reliably. And the costs of cleaning will not pay off financially - it will not bring that much increase in yield.
The system on the dusty field of the farmer or next to the coal power plant is excluded from this...

The other topic is sealing. I do not know any module manufacturer that offers something like that. If it really brought a significant increase in yield (new, clean modules compared to new, clean, sealed modules) many companies would offer it...
Here too: expensive gimmick, not economical.

A high-quality module is always better than any gimmicks.

But everyone has to decide that for themselves

Regards
Micha

The sealing does not bring any additional yield... that would be too good to be true. However, the sealing is supposed to prevent dirt from sticking again... so it brings a permanently higher yield...