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Scootdawg

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Reply with quote  #1 
I've been itching for a little project, and I thought a solar fan sounded about right. I've been able to find a few worthy tutorials, but none of them really help for what I've got in mind. I was able to find a tower fan that supposedly has a DC motor (https://www.amazon.com/Seville-Classics-UltraSlimline-Oscillating-Feature/dp/B010814IYO), though since it still plugs into AC outlets I'm not quite sure what this really means. Would any of you think this might be a worthy project to get into?

stmbtwle

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Reply with quote  #2 
It might be a dc motor running on rectified or converted AC, with some kind of speed control. Question is, what voltage is it, 120v, 12v, or something in between. I'd want to find out before ordering.

Simpler might be a 12vdc fan such as made for RVs, boats, or trucks.

You can also run an AC fan off DC by using an inverter.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Scootdawg

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Reply with quote  #3 
Thanks for your response stmbtwle! I've found this 12 volt fan through a bit of browsing, which seems to put out a nice amount of air (274 cubic meters per minute). I guess I just need to figure in a panel that would work well...given that I'm trying to keep a battery out of the equation, how would I exactly search for this? The specs show that the fan uses the following amps at its varying speeds: Low 1.18 Amp/ Med 1.62 Amp/ High 2.58 Amp.

Rick H Parker

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Reply with quote  #4 
12v * 1.18 Amp = 14.16 Watts
12V * 1.62 Amp = 19.44 Watts
12V * 2.58 Amp = 30.96 Watts

40+ Watt panel because panels are rated in peak watts.  You don't always get peak sunshine.
Then you need a 12V 3+ amp buck converter to shape the output voltage of the panel to 12V.
No battery required. Only works when the sun is shining.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #5 
Here's a converter: https://www.amazon.com/DROK-Waterproof-Converter-Regulator-Transformer/dp/B01H52OIN0/ref=sr_1_5?ie=UTF8&qid=1495108882&sr=8-5&keywords=voltage+reducer+24v+to+12v

That fan would probably run fine off a 40w panel though a 60w would give you more power.

Would that fan by any chance be an "Endless Breeze" by Fantastic Vent? They are good fans but have an annoying whine especially on high.

Also, when running a fan directly from solar be advised that on a cloudy day the fan will constantly be slowing down and speeding up as the clouds go over. The constant changing of pitch might or might not be an issue for you. (Been there done that)

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Scootdawg

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Reply with quote  #6 
Thanks for your input , Rick! So I've found this 40 watt 12 volt panel here: https://www.amazon.de/Solarpanel-Solarmodul-Solarzelle-Solar-Monokristallin/dp/B00L9OG6CW/ref=sr_1_8?ie=UTF8&qid=1495108907&sr=8-8&keywords=40+watt+solar

Could you possibly recommend a buck converter for this panel? The technical specs put the nominal voltage rating at 17.6 volts and the idle state at 21.8 volts. I'm not entirely fluent in German, but it also mentions a short circuit amperage level at 2.55 amps. 
Scootdawg

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Reply with quote  #7 
Quote:
Originally Posted by stmbtwle
Here's a converter: https://www.amazon.com/DROK-Waterproof-Converter-Regulator-Transformer/dp/B01H52OIN0/ref=sr_1_5?ie=UTF8&qid=1495108882&sr=8-5&keywords=voltage+reducer+24v+to+12v That fan would probably run fine off a 40w panel though a 60w would give you more power. Would that fan by any chance be an "Endless Breeze" by Fantastic Vent? They are good fans but have an annoying whine especially on high. Also, when running a fan directly from solar be advised that on a cloudy day the fan will constantly be slowing down and speeding up as the clouds go over. The constant changing of pitch might or might not be an issue for you. (Been there done that)


Ah, great! Thanks! I'm honestly able to go as high in wattage as possible, so long as it doesn't drive the price up more than it's worth. And yeah, the fan is the "Endless Breeze" [biggrin]. It appears as though every RV owner or trucker stands by it! I shouldn't be too bothered by a pitch change, though from what I've seen the fan still tends to be a bit quieter compared to other similar sized 12v fans.
Rick H Parker

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Reply with quote  #8 
"Could you possibly recommend a buck converter for this panel?"

US 99ยข if you can wait for it to come from Hong Kong.


http://www.ebay.com/itm/LM2596S-ADJ-Adjustable-DC-DC-Power-Module-Buck-Regulator-3A-5V-12V-24V-/162146135800?hash=item25c0a9aef8:g:Tg8AAOSwdzVXks-p

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Rick H Parker

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Reply with quote  #9 

Scootdawg what part of the world are you in?

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Scootdawg

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Reply with quote  #10 
Quote:
Originally Posted by Rick H Parker

Scootdawg what part of the world are you in?


Germany
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