Digital Differential Thermostat for your solar project. I use one of these to trip the pump on my solar hot water collectors, but they have many uses. Building a solar hot water system? Want to recover the heat from you attic in the winter? This will work perfectly to turn your pumps or fans on and off.
I rate the output section of this circuit board for 24V, AC or DC, and it can handle 5 amps. Note that this is a thermostat and not a motor controller, to turn on or off motors that run on AC line voltages you should use a proper relay or contactor, and control that with this thermostat.
I include two temperature sensors with this item. They are linear active temperature sensors that have been cased and potted, with short pieces of wire attached so you can extend them for your project.
Included also is a 12V 1A power power supply power the Thermostat, and a 25A Solid State Relay to run your fan/pump.- SPDT relay output. This means you have “normally open” and “normally closed” output
– LCD display of current sensor temperatures, current differential, and differential setpoint.
Freeze protection, will not trip relay if either of the sensors are disconnected, or below freezing
– User selectable Celsius/Fahrenheit readout.
– Will run from just about any “wall wart” type power supply. (not included)