which panel would i need...

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JoelKlemke
JoelKlemke Registered Users, Users Awaiting Email Confirmation Posts: 2 ✭
in Solar Beginners Corner #1
Hello all,

           I was thinking of making my own solar powered attic fan. If I wanted to run this fan(from a race car - draws 14 amps):
How many watt panel would it take to run that at a decent speed,please? 25, 40 watts?

Thank you in advance!
JK
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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #2
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    That fan is not really suited for the intended application, it is designed to move large amounts of air for short durations across a radiator.
    The motor is most likely brushed which is not desirable, needing a battery to support it  during times of low panel output, clouds passing as an example, a brushless motor would br a better choice, something like this  (for reference purpose ) https://www.amazon.com/ECO-WORTHY-65-Watt-18-Volt-Efficient-Brushless/dp/B01MQRU3B1

    One thing to consider is passive ventilation, I had a house which cooked in the summer, a fan was installed which helped dramatically. After a number of years the motor failed, but there was no noticeable change in temperature inside the house, just having a vent near the roof peak was enough to create airflow which would otherwise be trapped.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #3
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    Also lots of soffit venting, so ridge vents pull outside air (not conditioned air from living space).
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • JoelKlemke
    JoelKlemke Registered Users, Users Awaiting Email Confirmation Posts: 2 ✭
    edited June 2019 #4
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    Thank you all for the assistance!

    Mac, that fan is currently unavailable. May i please have your thoughts on this one, please?


    Have a great day!

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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,046 ✭✭✭✭✭
    #5
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    You can assemble the same set for less money.  The fans alone are usually less than $20.00. I have a pair of them in my garage powered by a hardwired old 65 watt panel. works great. Has for nearly 5 years now.
     

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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