Solar and Batteries

Hey Everyone,
I have been working on some projects lately that have thrown me into solar/battery land. I was wondering if anyone has any good resources for a community that may be able to answer questions related to solar/batteries/charging ect. I am currently working on a project that will need to run a small water pump for about 30 minutes, couple times a week 12v 5amp. I have been working on my solar charge controller to recharge the battery. But then I was looking at the 18650 batteries. I have a bunch of these and they seem like they would work. But I don’t know the best way to go about charging them.

Any suggestions/resources would be appreciated


Let me know if you made any progress on this @crankycoder I am interested in doing the same.