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I’m wondering anyone has used this while camping. I was looking for a way to take a fan or two with me to circulate air in the tent when I go on 3 day adventures (car to laocation, set up, car goes and parks somewhere else, no travel with camp gear)... anyone have any idea how long, in general, this would run a 16-20 in fan?
Power is equal to Voltage times Current. Specs on this thing for the 120V power outlet is 120V/85W max, so 85W = 120V * (Current), so the current at this rate is is 85W/120V = 0.7 amps or 700milliamps. 27,000mAh/700mA = 38hours.
This means that at it's max output for the 120V outlet, it can potentially run for 38.5 hours.
So now the question is how much current does your fan draw, because 85W, or .7 amps isn't very much at all. In fact, you'll be hard pressed to find even a small fan that can work at such low current. You might notice that the USB outlets can provide up to 3A - With this you might have better luck finding a small 5V desk fan that runs off USB. Keep in mind though, if you're drawing 3A, your run time then becomes 27,000/3,000 = 9 hours.
Max, you need to convert mAh to energy (watt hours) first:
27Ah*5V = 135Wh
135Wh/85W = 1.59h
You could run this for 1h35m.
Not 38 hours.
Your mistake was assuming that the mAh rating was for the 120V output. I believe it is for the 5V standard USB output.
Actually, reading a bit more, it looks likes the amp hour rating was for 3.6V so that the battery is under a 100 Wh FAA limit.
100/3.6 ~= 27.7, hence where we get all the 27,000 Ah battery packs.
This means that the 85W output would last for even less time: about 1h11m.
However, to answer the original question, which is about a 16 to 20 inch fan, which, on high would use, yes, about 85 Watts.
Hopefully batteries get better in the future!
Thank you both for the information. This was very helpful and I will be able to apply this as I look over future battery packs as well. It seems like, for the money, I might as well just buy one of the solar generators for about 400$ that you can get from most "outdoors" stores. A loud gas generator is not an option for me.