The first would be using a 6v 1w solar panel.
Diy solar panels charger.
I have a kit.
The second would be with the same solar panel but to charge 3 7v lithium batteries.
The central brain of our project is a dc to usb converter circuit.
For lighting with this same battery.
For simple smartphone charger.
With 4 high brightness leds.
What you ll need 6v mini solar panel 5v step up inverter usb charger circuit your charger cable flexible and foldable plastic card such as an old credit card.
Diy solar usb charger altoids step 1.
These boards gets.
This takes our aa power.
Dc to usb converter.
With a few odds and ends from around the house this build can be done for about 10.
Rocio with diy solar charger the author s wife rocio and their golden archie show off a diy solar charger with internal aa batteries for powering an iphone.
Diy solar battery charger step 1.
Thank you very much in advance.
Cost is less than 30.
How the tp4056 work.