Solar/Electrical question

[gvb]

Hello,

We have our official heatwave in Belgium since today (it's been 25+C for weeks and now 3 days in a row 30+).

In my shed it's like entering a sauna. It has on one side 5 or 6 small windows that are in the sun most of the day.
The roof is metal plate with wooden 'underroof'.
Would matte/blinding stickers help on the windows?

Now I was wondering if it would help to put 1 or 2 PC fans in it at the top just under the carrying beams to pull out the heat.

Best case running on some small solar panel(s).

Now comes the problem part...

How do you calculate what solar panel you need?

Most fans are 5 or 12V with minimal amount of ampère taken from the source.

I don't need them to run 24/7 so I don't need a battery either.

It's ok that it only runs when there is sun on the panel.

What should I look for or keep in mind?

[BADecker]

Start simple and cheap. Staplegun staple white plastic bags to the eves over the windows in such a way that there is air space between the windows and the bags. This will allow light in and keep the heat out, somewhat. The air space will be insulation between the bags and the windows. Try this before you go to the expense of solar cells, unles you want the solar anyway.

[gvb]

I have been looking around on Aliexpress and found this...

12V 4.2W DIY Solar panel for about 7.5 euros.

If I remember right I=P/U so 4.2 / 12 = 0.35A

The fan that's above my 2PACs takes according to the label 0.3A at 12V (it's currently running on 5V so it's speed and Amps is lower)

0.3A seems a lot as I found Corsair case fans that only need 0.035A on the other hand I see fans that might need 0.45A.


A solar power pack solution would allow me to keep the fans running even when there's not enough sunlight anymore but would I take the risk?
These things tend to explode or burn out.



I'll try your hint if I can find some think plastic maybe it already helps to drop the temp. inthere.