DC 12V Digital Thermostat Module -58℉ to 257℉ Fahrenheit Temp Display Temperature Controller Board with 20A Relay Waterproof Sensor Probe Dual LED Display Red Blue

Used it to control cooling fans for RV fridge. So no instructions and could be a bitch to initially figure out without any background. But realistically very easy once you do. Someone posted some instructions on here in Amazon so read those and you’ll get it. When you do this works fantastic. I actually bought more and use these boards now. These work for hot or cold with perfect control in Fahrenheit with adjustments for how long and how many degrees of heat or cooling. Great unit and reasonable!

I am using this for a small greenhouse and it works great. This is what I used... From Bastrop Guardian review: =============================== Technical Specifications: ------------------------------- Controller Power: .05VDC to 12VDC Controller Maximum Amperage: 20 Amps Controlled Device Votage: "0 to 14VDC" and "0 to 125VAC" Refresh rate: Approximately 0.5S Seconds Controller Draw: 150mA to 0.01 amps Note: I use this in my RV with Lithium Batters (14.4 Volts) and "So Far" - No Problems =============================== Features: ------------------------------- Modes: Cooling and Heating LED Display: Red & Blue. Temperature Range: -58 to +257 Degrees Farenheit Resolution: -3.9 ~ 99.9 Degrees Farenheit Accuracy: 1 Degree Farenheit Backlash Accuracy: 0.1 Degree Farenheit Memory: Retains its Settings after a "Power Disconnect" =============================== Light Indications: ------------------------------- "Lights On" = Your Controlled Device is On "Lights Off" = Your Controlled Device is Off Trouble Codes (Will Automatically "Power Off"): 1 = Sensor Missing or Damanged 2 = High Temperature Protection 3 = Low Temperature Protection =============================== Connectors: GND = 12VDC Power "Ground" VCC = 12VDC Power "Hot" KO = To Device K1 = From Source Note: This Device "Closes" [Dead Switch] Connector K0 (to Device) and K1 (from Source) when Activated (Passes Current [or Ground] "from" K1 "to" K0 to) your Controlled Device. Recommendation: If you are using a Device that Requires more than 20 Amps (or maybe "always" Regardless of Device Amperage Need), you may want to Use a Relay between this Controller and your Device - Using this Controller to "Trigger" your Relay and using the Relay to Power your Device. I always use a Relay for "All" my VDC Devices. Relay: https://www.amazon.com/gp/product/B000P61E36/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Relay Connector: https://www.amazon.com/gp/product/B001B801W2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 =============================== Parameter Setting Instructions: ------------------------------- "Set" Button: This Button will Allow you to: A) Enter the Temperature Setting B) Enter the Six Different Parameter Settings (Below) ----------------------------------------------- Setting the Temperature and Parameter Settings: on the Screen you want to Set/Change: A) Use the "+" Button to Increase the Value of the Parameter B) Use the "-" Button to Decrease the Value of the Parameter C) Press the "Set" Button once you Achieve your Desired Parameter Setting to Set ------------------------------- Parameter "P0" (Default "C" [Cooling]) / Temperature Default: 60 Degrees Chooses between Heating or Cooling (H/C). Once the Temperature Probe senses the "Set Temperature", the Relay Turns Off your Controlled Device. Important: See Parameter "P1" Below. ------------------------------- Parameter "P1" - (Default "2 Degrees"): Sets the Temperature "spread" between turning on your Controlled Device on and turning it off. Example: A) The relay will turn Off your Controlled Device when it Reaches "Set Temperature" (Parameter "P0" above) B) When the Temperature reaches "Set Temperature Spread Degrees +/- the Temperature Setting (Parameter "P0" above [H/C])", it will turn on your Controlled Device. Note: Increasing the "Spread" can keep your Controlled Device from turning On and Off too Often. ------------------------------- Parameter "P2" (Default "0 Degrees"): Temperature correction. Adjusts the Temperature the Probe is sensing if it is not reading correctly. Recommendation: Leave it at Default unless you are Certain there is a Temperature Reading Variance. ------------------------------- Parameter "P3" (Default "Off"): Adjusts "How Many Minutes" your Controlled Device Stays On within the "Temperature Parameters" (Parameters "P0" + "P1" Above). Note 1: Your Controlled Device will Continue to "Stay Off". Press the "Set Button" to Reset. Note 2: Only Needed if you Determine your Controlled Device is Staying On too long. ------------------------------- Parameter "P4" (Default "Off"): Adjusts "How Many Minutes" your Controlled Device Stays Off within the "Temperature Parameters" (Parameters "P0" + "P1" Above). Note 1: Your Controlled Device will Continue to "Stay On". Press the "Set Button" Repeatedly to Reset. Note 2: Only Needed if you Determine your Controlled Device is Staying Off too long. ------------------------------- Parameter "P5" (Default "Off") A) "On" Locks your Chosen Parameter Settings. B) "Off" Unlocks your Chosen Parameter Settings for when you'd like to Update them.

I have purchased 7 of these. 3 in operation currently, 2 spares, and 2 that I managed to short out somehow. I love that the load circuit can handle AC or DC, and that the read out operates on DC. Very handy in my off grid home. One unit senses temp on a thermal storage tank and controls a 120 vac circulator pump, the second senses my wood boiler temp and controls a 120 vac blower. The third controls a 12 vdc radiator fan and 12 vdc circulator pump. I did somehow short two of them out... pretty sure that was my fault. My only complaints are that they are not very easy to mount to anything and they do not include any schematics whatsoever. What you see on the images section of Amazon is all you get, which is fine as long as you are aware.

Read the other reviews for "how to use" instructions if you have any problems with the diagram. They're supposed to arrive as "cooling" controllers, but mine was set to heat. Easy to change, and very easy to work with. I love that the relay is independent of the control circuit. Great value, nice unit! I used these to control a cooling fan installations where the inverter-charger or fridge was in a small cabinet that HAD to have positive ventilation. They have proven reliable and essential where temperature is an issue.

I have the configuration set to heat at 50°C. While heating was achieved, it was within minutes that the relay which was rated for 125v AC 20A that it started smoking and bubbling. Prior to this, the single DC voltage supply worked well, but wanted to test the AC capability. It proved a potential fire hazard which really stinks. Cannot recommend for AC applications. Use caution.

Works as advertised, very easy to program and clear display, would prefer the 4 circuit connectors to be bigger, but that's not a deal breaker. So far very appy with purchase.