If you want to go the diy route: https://circuitmaker.com/Projects/Details/Craig-Peacock-4/LT8490-Buck-Boost-Multi-Chemistry-Battery-Charger-with-MPPT
you can request the lt8490 ic for sample for free from analog devices.
Hi. I've bought 18650 batteries from aliexpressbefore. I was wondering if anyone here has bought 18650 from Taobao as their prices are a lot cheaper. Although the cells are not "name brand" their seems to be good deals like 2600mah for $0.80 and 3000mah $1.25. These listings have many orders and...
If you don't mine cutting your own:
18650 shrink wrap cutting jig:
You should do 24v led strip and use 7s. More efficicent and can run longer length strips.
You could use this DIY Kits Solar Lamp Board Control Sensor Lithium Battery Charger Night Light Controller Module Home/Outdoor Circuit Automatic
http://s.aliexpress.com/UbYVVfui?fromSns=Copy to Clipboard...