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SOLAR 6-12 VOLT BATTERY CHARGER

The circuit is a high efficiency charger, it is useful for charging 6 to 12V batteries using small number of solar cells. The solar cells can be connected in series or parallel to generate 1 to 12V , cells voltage has to be lower than battery voltage. When the mosfet is on it charges the coil with energy from the solar cells, and when the mosfet is off that energy is discharged into the battery.

Circuit Description
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The 6 inverters CMOS are used as a free running oscillator. The MOSFET charges the coil when it's on, and when it's off the coil dumps its charge via the diode into the battery.

BS170 can be replaced by equivalent MOSFET.

The MOSFET and the diode are capable of charge currents up to 50mA, for higher currents they can be replaced by higher current components.