Hello, thanks for reply. I have a question. I am using this product:https://www.adafruit.com/products/500
output 6V at 530 mA, 3.4W.
The output voltage for this panel with cloudy days is less than 5V, then the charger not work.
Datasheet of charger:Use any 6V solar panel (6V seems to work best, 5.5V may work, 5V does not work)
I'm thinking to use a more big solar panel,12V 10W, for I get more voltage in cloudy days and regulate the output voltage of solar panel to connect the charger.
What do you think?
I use the resistor for increase the charge rate, I solde two resistors of 1K in paralell with the resistor of 2K.