Solar powered fans for ventilating under floorboards.

Perks · 02-05-2024 08:25PM #1

I've an old house off-grid with a history of rotting floors.

I'm looking to increase airflow in/out of pre exisitng grills(I may add another) by adding approx 20 12v 1.44 Watt computer fans optimised for static pressure.

What size battery am I looking at?

10-10-20 · 02-05-2024 09:02PM

https://www.boards.ie/discussion/2058350047/solar-powered-fans-for-ventilating-under-floorboards

Hi! So are you looking to simply charge the batteries during the day and have the fans power on constantly?

https://www.boards.ie/discussion/2058326423/12v-battery-advise

Some basic calcs:

20 * 2W = 40W, plus let's say 20W overhead equals 60W/hr.

60W/hr = 1.5kWh per day.

https://www.batterystuff.com/kb/tools/calculator-sizing-a-battery-to-a-load.html

You'll need a deep discharge battery around 230Ah. Your solar cells will need to provide greater than 1.5kWh to charge the cell, and you'll need to look at a BMS to prevent the battery from deep-discharging.

Perks · 02-05-2024 09:57PM

Hi, Thanks.

Yes thats the idea, charge battery during the day and run fans all the time.

Solar powered fans for ventilating under floorboards.

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