In Line Duct Fan Off Grid

Heisenberg Registered Users Posts: 23 ✭✭
What are your guys thoughts on running an in line duct fan on an off grid solar battery bank (250 ah) via an Inverter power supply. Fan uses 21 watts and 1.2 amps when running. Will not run continuously, and will be controlled by a thermostat to come on when needed. Typical usage estimated at a few hours a day. 


  • 706jim
    706jim Solar Expert Posts: 511 ✭✭✭✭
    For a compost toilet? Whatever the application it should work.
    Island cottage solar system with 2500 watts of panels, 1kw facing southeast 1.3kw facing southwest 170watt ancient Arco's facing south. All panels in parallel for a 24 volt system. Trace DR1524 MSW inverter, Outback Flexmax 80 MPPT charge controller 8 Trojan L16's. Insignia 11.5 cubic foot electric fridge. My 30th year.
  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    You may want to consider a brushless DC duct fan and run directly with a panel, if running is during the day is all that is needed.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
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  • Heisenberg
    Heisenberg Registered Users Posts: 23 ✭✭
    Thanks for the input. Im actually running a 4” duct line from the wood burner area into a new room I added to the cabin. The goal is to transfer “some” heat into the new room to a vent. Ive been looking at some low wattage bathroom exhaust fans as a possibility or now looking at some in line duct fans. The in line fan im looking at now is actually a EC-motor that is controlled using PWM (Pulse Width Modulation). Like i said before, I only want the fan to kick on when temp set point is below desired. Any other ideas for this application? The cabin is weekend use. Thanks

  • wellbuilt
    wellbuilt Solar Expert Posts: 763 ✭✭✭✭
    A 4”vent  fan won’t make much difference , the best way to move heat is a regular box fan sitting on the floor blowing into the room . 
     The fan will circulate heat nicely .
     If you have 2 rooms back to back you could place a fan at the top of the wall and blow heat into the room . 
        I heat a 3000sf home with one stove in the living room , it stays up around 65o every where no fans are really needed .
      I haven’t had A  Central heating system in 25 years . 
    Out back  flex power one  with out back 3648 inverter fm80 charge controler  flex net  mate 16 gc215 battery’s 4425 Watts solar .
  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    i'll second the idea for using a cheap 20" box fan, you need to move a fair amount of air, slowly, so it does not feel cold and drafty
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