Solar Powered Exhaust Fan?

Author: Liang

May. 13, 2024

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Solar Powered Exhaust Fan?

Most of the info I've seen is that the solar powered ones just don't have enough horsepower to really move the air. You'll see ratings like 10 watts, and that's on a cloudless day with the sun shining. That's less power than the dome light in your car. It's just not going to make much of a difference.

It's probably better than nothing, but I would go with a wired one. The actual electricity used is very little and they usually have a thermostat control so they're only be used when needed or you could put a switch on it.

They use around 100 watts, depending on the model.

So 100 watts x 10 hours a day is 1 kwh
1 kwh x $.10 (average utility rate per KwH) x 30 days =
$3 a month for the summer months

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help with solar fan — northernarizona-windandsun

Hi everyone. Thanks in advance for helping a newbie! I'm trying to get a fan hooked up in my greenhouse. 
I got a 12V radiator fan, specs say it has a 6.6amp draw. I have a 150W/20A solar panel installed.
Summary of trials:
Panel -> charge controller -> battery -> thermostat -> fan = works but drains battery
Panel -> voltage regulator -> fan = fan clicks, doesn't start
Panel -> thermostat -> fan = fan clicks, doesn't start

Details:
I tried hooking the panel up to a voltage regulator to keep voltage around 14V but when hooked up the fan just clicks like it's trying to start, but won't. I turned up the amperage to max and the voltage above 16V on the regulator and same thing. So I hooked up a charge controller and old car battery to control the fan, and that works great but it drains my battery in half a day, so not the best option. 
The fan is wired through a thermostat so it only runs over 85 deg to try to save the battery, but it still needs to run for 7+hrs/day and runs the battery to 9V before the end of the day.
Curious if anyone knows why the fan might be jumping/clicking but not starting when going directly to the panel through the thermostat, with or without the voltage regulator. If I go directly to the panel the fan works but doesn't seem as strong as going through the battery. 


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