Electronic – Noobie is trying to match a solar power bank and a wireless camera

battery-chargingsolar cell

my dear friends all around the world!

I'm very interesting about this cool solar power thing, and I really want to start connecting all of my stuff to panels and so.

But for my first and ,hopefully, successful try, I will simply use a simple (apparently not so simple for me, otherwise I wouldn't be here..) solar power bank. No need for charger regulators and other exciting things that might burn down my roof top..

The solar power bank is 20Ah (but I don't know how much watt per hour. The nice seller hasn't replied me yet) –

http://goo.gl/0svXM6

The camera is 12v/2A and 6-7W, and have to work 24*7 –

http://goo.gl/MKM0yR

That is the question.

I really appreciate your kindly help. A lot.

Thanks,

Roni

Note:
I really did tried to understand it by myself, but I still have doubts (and those items aren't cheap at all when buying bulks of them as need to). I'm a programmer, so I did have a few lessons in electronics. 10 years ago..

Few of the posts here that help me the most –

Solar panel & battery math verification

Solar panel and 120mm Computer fan

Why isn't the solar panel charging the battery?

Battery recharging via solar panel

Best Answer

First thing is to match a solar panel to the load.

You need 7 W, but your panel should be rated for much more, because the average solar energy per day (taking into account the night, clouds and seasons) is a small fraction of the peak power; in the winter in high latitudes you might get 10 to 20 times less. In that case you're looking at a solar panel rated around 100-150 W. If you're restricting yourself to the summer time in bright climates you'd need around 30 W.

The solar panel in the item you posted is said to be 1.5 V, 150 mA. If that's correct, then it can only produce 0.2 W. That is 10-100x too little. No matter what kind of battery is inside, it will never be able to recharge.

Once you have a suitable panel you can start to think about the battery size you need to get you through the night and the cloudiest days. Your camera is a 12V system, which is good because you can buy parts meant for 12V off-grid systems, eg. a solar charge regulator and a battery.

Related Topic