4P1S 3k9 180K Basic Solar Charger v1.01 Light controller

522

06:57:08

This Circuit uses three Transistors as Switches.

The left hand voltage source is the Solar Panel and the right hand voltage source is the battery.

In Short, when Solar V drop below around 1.9v the PNP opens to run the Light LED.

If Solar V is between 1.91 and Batt Voltage plus 0.5V the LED is switched off and excess power is dissipated through one of the 10k resistors.

When Solar Voltage Exceeds Batt voltage by 0.5V an NPN opens to provide a charge to the battery. 

There is no charge regulation provided, so this is only recommended for a panel providing less than 200mA or so.

In theory all components are rated to well in excess of 36V so this could be used on a 6 or 12V system easily enough, provided the solar panel doesn't exceed 3W

published 11 years ago

rondamato

11 years ago

Great little circuit! I'm gonna breadboard this today and see what happens. 200ma is perfect for a lone mp3 player! Thanks.

cpjfox

11 years ago

Keep in mind the load output only runs at night. This is essentially feeding amps from the panel straight to the battery with no modulation

cpjfox

11 years ago

Safe for lead acid or nimh only.

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