I'm looking for a simple few component and efficient circuit diagram of a solar charger to charge 3 1.2v NiMh batteries during the day and at night it must switch to light up 3 White LED's.
I got an idea of using a LDR 1 transistor, diode and resistor, but I don't think it will be efficent because at night I will be losing some power to the resistor ?
And does anyone know what will happen to a 4v lead acid battery if I charge it with a 12v solar panel ? Will it burst from overcharge ?