I am trying to make a solar cell phone charger. So far I have been relatively successful using a 6 volt 0.3 Watt solar panel. Through a 7805 positive voltage regulator to a USB socket which connects to the phone I have a solar cell phone charger.
This has limitations as the panel is small 75mm x 50mm so the smallest amount of cloud cover and the charge stops.
I want to find if using this configuration it would be possible for the solar panel to charge 4 x 1.5 volt AA batteries which then feed the USB socket, when the phone is plugged into the socket the batteries charge the phone.
Is this possible if so do I have to have a separate charging circuit for the batteries and then the regulator to the USB socket.
Any advice and assistance will be appreciated
This has limitations as the panel is small 75mm x 50mm so the smallest amount of cloud cover and the charge stops.
I want to find if using this configuration it would be possible for the solar panel to charge 4 x 1.5 volt AA batteries which then feed the USB socket, when the phone is plugged into the socket the batteries charge the phone.
Is this possible if so do I have to have a separate charging circuit for the batteries and then the regulator to the USB socket.
Any advice and assistance will be appreciated