SOLAR PUMP CONTROLLER CIRCUIT
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Additional Information
This circuit is used to electronically control the
pump in a
solar water heating system. Full details of the operation of this circuit are provided in our article
Solar Water Heating Pump Controller.
The two
LM335Z Temperature Sensors are provided pre-soldered onto short 100mm leads. Additional lengths of
red cable and
black cable should be purchased if required to enable the temperature sensors to reach the
solar water heating panel and to the
hot water storage tank. Some
3A terminal strip is provided to make the necessary connections.
Using the Pump Controller
The first
temperature sensor should be stuck to the copper pipe as it leaves the heating panel, the second should be stuck to the outside of the hot water tank underneath the insulation.
Output from the Controller
When the temperature meaured at the panel is higher than that measured at the tank - power is provided at the output which can be used to directly power a small (i.e.
sub 3 Amp) 12V
solar water heating pump, or to trigger a
12V relay connected to a
mains-powered pump or large
12V pump and suitable power source.
If this controller is to be connected to a relay-triggered mains-powered pump, great care needs to be taken to ensure that all high voltage connections are made
securely, that they are well
insulated, and that the pump is correctly
earthed. We recommend that you employ the services of a
qualified electrician.
NEW Click here for details of our new microprocessor-controlled
Solar Pump Controller with Relay - an enhanced version of this circuit with a fitted 12V rated
10 Amp relay.
Connection Diagram
Click here to view the
connection diagram for the REUK
solar pump controller.
Buying the Individual Components
If you would like to save some money and build this
solar pump controller yourself, we can supply the necessary electronic components if required -
LM335Z temperature sensors, the power MOSFET, resistors, capacitors, connectors, connecting leads, and the
LM393 comparator chip. Contact
neil@reuk.co.uk for further details and pricing.
Related REUK.co.uk Articles
Build an electronic pump controller for a solar water heating system
Find a suitable water pump for a solar water heating system
Read about the new REUK solar pump controller for swimming pool heating
Find out how to make a waterproof temperature probe
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