I have already bought a 12 V 40 W solar panel. Its controller is also on the way.
I will be using it to charge a lithium ion battery pack of 12 V 13 Ah. The charge controller has options to program it, and I am also using a 40 Ah protection/balance charging board in addition to protect the batteries.
I will be running only two 12 V, 9 W DC LEDs from this solar setup. Only one LED is required to run 1 to 5 hours a day. So I hope the battery pack is enough.
But the confusion came when I planned to add two IP cameras near this solar panel to save outside activity. Both are 5 V cameras.
So I have two options.
Buy separate solar panel (may be 12 V, 10 W) and use a 12-24 V to 5 V buck convertor and use it to charge a 20000 mAh powerbank. And use it to run the cameras (from panel during day and from powerbank during night time). All I need is a new panel, I have every other component in stock.
Instead of buying a new solar panel I can upgrade my current battery pack to 12 V 20 Ah and connect the 12-24 V to 5 V buck convertor directly to the pack and always run the cameras on it. If I connect the buck convertor to the load output of my controller, it will disconnect the load after 24 hours. So I will be drawing power from the battery pack directly. I will need to buy only the extra batteries.
Buy new solar panel, and use it as an additional solar setup with another solar controller. It will be a 12 V setup, I will use buck convertor to run 5 V cameras.
What should I do?
The two light are important. It should work any time. I am worries I apply the option 2, it will drain the battery and LEDs work work when needed.
I know there are better options, if I spend more money, but what is the fun that? We should be able to use components which are in stock with us and use some tricks.
Edit: Each camera seems to be drawing 5V and less than .30A always. May be I can also add a 12V, 2watt Infrared Illuminator Light to support the two cameras at night.