ᐅ Controlled shading of solar thermal collector panels using blinds or similar devices

Hello dear house building forum members,

A few years ago, I shared our issues with an oversized solar thermal system here (clicking noises, Oct. 23 – by the way, no real solution has been found yet). Now I’d like to open a discussion on the following topic:

Who has experience with blinds for solar panels and can possibly recommend manufacturers, suppliers, or contractors who design and install such systems? I have seen this online before but can no longer find the website.

Are there any important factors to consider?

Thank you very much for any input!

Without knowing the old systems.

But if work is already being done on the roof, simply removing (parts of) the solar thermal system and installing photovoltaic panels instead seems to me the more sensible option.

Hello Molybdean,
thanks for your suggestion. I’m laughing because that was exactly what crossed my mind some time ago – more in the sense of "if only I had back then...". However, everything also costs money, and I hope that using blinds will be more cost-effective. You just have to compare the options.

Modules are cheaper than ever. You will probably need scaffolding for both options, and the substructure is likely no more expensive than a custom-made blind for the other modules.

And on top of that, there’s the electrical work.

At least I would get some quotes (or I’d just climb onto the roof myself, but that’s something you have to want and be able to do).

I am a strong advocate for photovoltaic systems.
When considering energy systems for buildings on an individual basis, it is important to keep in mind the timing of energy production and consumption. The differences that arise in determining the "best" solutions can be quite striking. The energy input from solar thermal systems should not be underestimated when used effectively.

I fully agree with my colleague Molybdaen. Because blinds like that are a kind of unicorn thing that’s definitely as expensive as fully covering the roof with photovoltaic panels. The scaffolding with safety measures, etc., is always necessary anyway. Besides, the blinds will crumble away after 10 years, whereas photovoltaic systems usually last 20 years. Add an electric heating rod or even a domestic hot water heat pump, and you have a far better system.