Solar Household fan

[ohie]

Hi, recently my house was having blackout for a few time in a month. And I have to young children who are used to Air con. So, I was thinking, is the any solar fan which is not expensive and reliable. The usage will be in the night only. Thks.

[Mike90250]

Sorry. Solar is expensive. But it is reliable. If you are worried about nighttime, you will need batteries & charge controller. If you don't get a 12V DC fan (like a fan for a car) you will need an inverter to convert the 12Vdc to 120Vac.

I would suggest you use a high quality, 3 stage battery charger, run from the AC outlet, rather than a solar panel, and mounting it, and keeping it clean.

Battery charger $90
DC - AC pure sine inverter $250
2, 6V sealed AGM batteries $400
or
2, 6V flooded golf car batteries $200
20" box fan $20
If you want solar, add $600 for a 150W panel, and change the battery charger, to a charge controller

[ohie]

thanks mike for the info, you are really helpfull. now, I really found the correct forum.

[ohie]

How do we calculate the power consumption of a item, and how many solar panel needed for it..like you have suggested that 20" fan need a 150 W panel. what is the fomula to calculate.

[Jarod]

How do we calculate the power consumption of a item, and how many solar panel needed for it..like you have suggested that 20" fan need a 150 W panel. what is the fomula to calculate.

1. the 20" fan may have a engine power of 30W , and it works for 5 hours for one day, it will need electricity： 30W

[Mike90250]

How do we calculate the power consumption of a item, and how many solar panel needed for it..like you have suggested that 20" fan need a 150 W panel. what is the fomula to calculate.

You have to look at the label of the fan, and find something like
120VAC 80watts
or
115VAC .7A
or
115VAC 2VA

When we know what those #'s are, then we can continue to figure how many hours you want to run it from the battery.

[ohie]

Thanks guys.