Your Questions About Solar Powered Fan

Carol asks…

using fan to vent Oxygen and Hydrogen gas?

I have a solar powered shed i have build a cubard to store the battery banks in when the battery's are charging i am told the batterys release Oxygen and Hydrogen should i use fans to Vent the cubard

ssadmin answers:

As long as there's even a little hole at the top of the cupboard, the hydrogen will find its way out.

Mary asks…

I want to run my house fully on solar power ?

I want to run my house fully on solar power including AC's?

10 energy savor bulbs (40w each)+15 tube lights (75 w each) + 8 outdoor lights (100 w each) + 8 Fans + 3 PC + Printer + 3 TV +Watar Pump + Wataer Heater + 5 ACs (1.5 ton each).

ssadmin answers:

For most people solar energy can reduce electric consumption, but not entirely replace a connection to the grid.

Besides – solar is day time business only. You still need a connection to the grid for night time.

Follow the link below for some more info.

Helen asks…

Solar electric system help, please? DIY?

I'm planning to construct a solar powered ventilator. I have several questions.
If I use just one 12v dc solar panel (PV Module), how many fans( CPU Fan) can I operate?
Do i need a battery and a charge controller?
What about DC input?
How do I set up the system with the basic equipment to operate this solar powered ventilator project of mine?

Tips and links to other websites are are very much appreciated. Thank you for sharing your knowledge.

P/S: I am not an electrician neither an engineer in any engineering field. I just want to learn and invent something for the sake of inventing only.

ssadmin answers:

Very general answer. What you plan is difficult if you want to make it perfect. If you want to make it quick and dirty for fun, it could be a neat project.

A CPU fan is a great little thing to power because it is very well balanced and takes little energy.
Try to get some data on the fan. I am just guessing, but it is bound to be much less than 5 V DC.

If you want to play around, get some rechargeable batteries. See how many batteries, hooked in series, it takes you to power the fans. The fan has a little cable. One lead is positive and one negative. You might find that from 4 rechargeable batteries, you can run one to four fans for some period of time. Try a parallel configuration and see what happens.

Use the solar panel to charge the batteries. Use the batteries to power the fans. The reason is that the fans will then always spin at their usual rate, and they can spin even in the dark.

Get a good sense of what is positve and what is negative on your batteries and leads. Be careful not to mess up your panel by using positve and negative incorrectly.

Good luck.

John asks…

Solar electric system help, please? DIY?

I'm planning to construct a solar powered ventilator. I have several questions.
If I use just one 12v dc solar panel (PV Module), how many fans( CPU Fan) can I operate?
Do i need a battery and a charge controller?
What about DC input?
How do I set up the system with the basic equipment to operate this solar powered ventilator project of mine?

Tips and links to other websites are are very much appreciated. Thank you for sharing your knowledge.

P/S: I am not an electrician neither an engineer in any engineering field. I just want to learn and invent something for the sake of inventing only.

ssadmin answers:

If you want to power the fans only when solar energy is produce, the solution is rather simple, the sum of the load current should be a bit less than the current the panel can provide.

I believe a typical 80mm CPU fan draws 150ma, which is about 1.8W (I'd round that to 2W), and leave extra, so a 5 watt panel should run two fans easy.

If you want to run the fans all the time, in addition for accounting for powering the fans needed when solar is present, you need to account solar power needed to charge a battery at least enough to power when solar is not present in the one day, if not to cover a couple days with weak solar (such as overcast days). For that, you need a battery with enough capacity for those “non solar” conditions, and panel capacity to run your load and charge the battery. You will likely need a charge controller depending on capacity.

Sandra asks…

how many solar cells would i need to charge a 12V battery?

how many solar cells would i need to charge a 12V battery or to produce enough electricity to start powering some house hold items like a radio or a fan etc.

Specifications:

Solar Cell Type: Multi-Crystalline
Voltage (oc): 0.55V
Amperage (isc): 100mA
Wattage: 0.06W

ssadmin answers:

Typical solar panels for 12V systems have up to over 21V open circuit voltage, so you would need 39 such solar cells.

Of course you need to connect those cells in series, so that the voltage of each cell would be added. In such a case the amperage will still be 100 mA, but your power would be 39×0,06W = 2,34 W. This would be enough to power two 12V computer fans, but not much more. Even the radio might need more power…

To increase the power and amperage, connect sets of 39 cells in parallel, so that the voltage remains the same and only the amperage and power increases.

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