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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, June 01, 2021 03:06 PM
Hobby Circuits List
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Solar Circuits, Control,
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SOLAR POWERED PUMP MOTOR
CONTROLLER |
A Discover Circuits visitor
had a problem. He needed a simple on/off controller for his solar powered
water pump. His system used two 12v 50 watt solar panels wired in series.
The power from the solar panels drove a submerged water pump. However, during
overcast skies the pump motor did not operate properly due to the lack of power from
the panel. He wanted a circuit which would turn off power to the motor during
low sun conditions. The circuit below performs this function. A small
0.1” x 0.1” photodiode monitors the sunlight intensity. The current from the
diode is proportional to sunlight intensity. An adjustable load resistor
across the diode converts the current into a voltage and feeds the to a voltage
comparator circuit. The output of the comparator drives a small n-channel
MOSFET, which in turn drives a high current p-channel MOSFET, controlling power to
the pump motor. When the sunlight is less than one fourth of full intensity,
power to the motor is turned off. |
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Solar Powered Water Pump |
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Click on Circuit Below to view PDF of Schematic |
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Circuits, Control,
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eMail David A.
Johnson, P.E. about this circuit |
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