I want to power this device, which is a tplink wr703n. It is a small travel router. When I looked at the specs, it says that it uses 100mA for wifi, and 85mA to run it. This is incredibly low. Now, what I want to do, to run this device along with a webcam and a flash drive (a flashed openwrt, and flash drive is acting as the hard drive storage).
I currently have it running on a 5V / 1A usb port. The battery pack is 10,000mA (10A)
at the time of this post it has been 11 hours (edit; it just died past the mark when I start it by the minute) since I started this. It is down to <25% battery.
I am looking at solar panel / battery(ies) to power this for 24/7. If I want to know what I will need would I take 10,000 / total hours (running device with webcam streaming) to get the mA it draws per hour?
So, lets say it ran for 11 hours, so 10,000/11 = 909mA?
Seems about right. Now to get watts.
I would do w = v * a, so 5 * 909 = 4.5 watts.
Now to get how many watts for 24 hours would I do 4.5 * 24 = 108 watts? That seems high.
Well, then again the sun is only out (in my area) would be 11 hours average.
But maybe only 4-6 peak sun hours (if that is the correct term)
So we will say around 9 hours (just for the day not just peak) 4.5 * 9 = 40.5 watts .
If that is true, that were a pretty big solar panel for such small device.
Now this part is what I definitely help with. Battery. I was on a website looking at their 3.7V 6600mA Li-ion batteries, and made me question would I really want to run my stuff on 3.7V?
If I want to run smaller solar panel would I need a bigger battery to even it out? How would I determine adequate battery for the project?