Cheap(est?) Lithium Ion PWM Solar Charge Controller - 12v Solar Shed - YouTube
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Adafruit Universal USB / DC / Solar Lithium Ion/Polymer charger [bq24074] : ID 4755 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Dakota Lithium and Zamp Solar 12v 200ah Off-grid Power System
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Charge Li-ion batteries with regular Charge controller made for Lead Acid batteries - YouTube
DIY - Solar Battery Charger | Solar battery charger, Solar battery, Diy solar
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USB / DC / Solar Lithium Ion/Polymer charger [Rev C] : ID 390 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Renogy 24V 10A 240-Watt AC-to-DC LFP Portable Solar Battery Charger Plug-and-Play RBC10A2P-US - The Home Depot