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Step 8Fan wiring
A tip on fan wiring. Use Radio Shack high grade 9 volt battery snap leads.
Wire the 9 volt snap connector properly at the fan end.
Wire the other 9 volt snap to a 12 volt cigarette lighter plug. Do this one reverse polarity. Backwards.
This allows you to run the fan off a jumper pack or car, then also connect up a Radio Shack 8AA battery holder. You can then use 8 AA rechargeable batts to power fan at 10 volts. With a small solar charger you can power the fan anywhere.
Using a jumper pack to run the fan makes better sense. A small solar panel can charge the jumper pack for really long runtimes. Plus you have a jumper pack to charge a cell phone etc.
There are many ways to hook up a fan to do this job. I can't list them all.
My fan is a Japan Servo 24 volt. I can run it off 24 volt, 12 volt, and 10 volts from the 8AA pack. The stove runs pretty well at all power settings.
Here is a link to purchase the correct fan:
Japan Servo 12 VDC 23 CFM BLOWER model FBDC12H7P
https://www.surpluscenter.com/item.asp?item=16-1358&catname=electric
The speed of the blower determines how long your burn time and flame quality will be. Too slow of a blower/fan will make large yellow tarry flame. The right speed will give you nice blue flames.
Make sure you can get about 45 minutes to 1 hour burn time. Closer to 1 hour is best. After 40 or so minutes you will have hot glowing coals in the burn pot. There will still be a huge amount of heat.
If you reload small amounts of pellets starting at the 30 minute mark, you can keep a nice burn going for longer than an hour. You will have to experiment with this.
Wire the 9 volt snap connector properly at the fan end.
Wire the other 9 volt snap to a 12 volt cigarette lighter plug. Do this one reverse polarity. Backwards.
This allows you to run the fan off a jumper pack or car, then also connect up a Radio Shack 8AA battery holder. You can then use 8 AA rechargeable batts to power fan at 10 volts. With a small solar charger you can power the fan anywhere.
Using a jumper pack to run the fan makes better sense. A small solar panel can charge the jumper pack for really long runtimes. Plus you have a jumper pack to charge a cell phone etc.
There are many ways to hook up a fan to do this job. I can't list them all.
My fan is a Japan Servo 24 volt. I can run it off 24 volt, 12 volt, and 10 volts from the 8AA pack. The stove runs pretty well at all power settings.
Here is a link to purchase the correct fan:
Japan Servo 12 VDC 23 CFM BLOWER model FBDC12H7P
https://www.surpluscenter.com/item.asp?item=16-1358&catname=electric
The speed of the blower determines how long your burn time and flame quality will be. Too slow of a blower/fan will make large yellow tarry flame. The right speed will give you nice blue flames.
Make sure you can get about 45 minutes to 1 hour burn time. Closer to 1 hour is best. After 40 or so minutes you will have hot glowing coals in the burn pot. There will still be a huge amount of heat.
If you reload small amounts of pellets starting at the 30 minute mark, you can keep a nice burn going for longer than an hour. You will have to experiment with this.
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-tXm
I cut the duct opening very tight. It holds the fan pretty tight all by itself.
The fan does just fine. Not hot at all. This is due to the double burn pot configuration. The outer burn pot keeps the heat concentrated on the inner pot for the most part. The large outer pot only reaches around 100 deg down near the bottom. This is the beauty of the multi pot solution.
Automotive header/exhaust manifold tape would be a great addition to the 6 quart pot:
http://www.summitracing.com/parts/THE-11002/
It would keep the heat contained in the burn area. The entire stove would probably be cooler on the outside surfaces.
You could add an air duct between the blower and the side of the stove, where a slot would allow a door to partially close the duct at will. See the small sketch.
The flap can fit really shoddy, cause you only need to slow the flow of air a little.
Here is the setup iI settled for:
- a 5V blower fan
- two solar panel in parallel (1,715W) that can directly power the fan in sunlight.
- a 4 AA (NIMH) battery pack, that can be recharge by the solar panel.
On the picture, the fan is only powered by the solar panels, and it runs full speed. I'll be able to save batteries when it's sunny. Moreover, you can easily control the speed of the fan by covering/uncovering the panels!
What is the model/part number of the fan?
Would like to see how many CFM it is.
It's a 5V x 0,15A and measures 50mm x 15 mm. It was listed as 15 cfm. Seems like enough power for the size of my stove, whick is a bit smaller than your. Anyway, I will try a bigger one: 5V/0,18A; 75 x 25 mm.
http://amzn.com/B005AKCNBY
Where did you buy those specific models of fan?
They sound about right CFM wise.
My 24 v fan runs very slow. It's not a blast furnace thing.
I have a 5v USB adapter for 12v cig. lighter socket. I could run 5v easily too.
There are also 12v laptop power supplies with an accessory 5v USB receptacle on them. I'm going to hook one to a Ryobi cordless tool batt pack. Having a USB jack is bonus.
That large 5v Amazon fan looks good. It has accessory mounting holes all over it.
It would be perfect to mount a rain cover for the fan.
That's going to be my next addon. I want the big gasifier to be all weather.
I'm from NY. It rained all the time there.
And of course it's going to be rainy cold when using a gasifier outdoors.
You could use duct tape and folded tinfoil...or thin sheet metal cut to fit.
Each fan is going to be different.
Around the camp, I'll use a 12V power pack with an USB adapter. On the trail, I'll use the pack with 4 NIMH batteries (4,8V); it last for about 8 hours.