DC 12V

I used this to build a temperature controller for my older Coleman Peltier cooler. These coolers use a lot of energy and will run down an EcoFlo River 3 plus in less than 4 hours, since they never turn off. This bayite controller will regulate the temperature inside the cooler. This should extend the run time on one battery charge to past four hours, and will keep the food from freezing if the cooler is in an air conditioned car. This will also allow the temperature to be set to 40 degrees F which is good enough for vegetables, fruits, and other foods that are not meat and dairy type foods. For those, I have a compressor type cooler.. You can set the temperature deadband to as low as 1 degree F if desired. And it does respond well enough to keep the temperature at set point. That is within the capabilities of a Peltier type cooler. It is easy to operate, you just press “set” and then press the up or down button to the desired temperature and then press “set “ again to save the temperature setting. The connectors are a clamp type that will, with a little care, accommodate a number 10awg wire size. However, you might as well stick with either 16 or 14awg wire since the relay inside is only good for a 10 amp load. This is more than enough to control the cooler which draws about 50 or so watts which is just over 4 amps at 12 volts. This controller adds less than an additional 10 watts to that for a total of about 5 amps at 12 volts dc. Another feature it has is you can set a time delay so it won’t restart the load after it has reached the set point. But it does not start the timer until cooling is called for, not from the time it stopped the cooling cycle. At less than 20 bucks for this I feel it is a decent price, however there are several different brands of these products that look as if they are produced in one factory and sold to different vendors under different brand names. The prices seem to vary considerably, but the lesser priced ones don’t seem to get as good of reviews as the bayite and inkbird ones. This also comes with a temperature sensor as well. So far it gets five stars.

This is exactly as described and worked perfectly the very first time I wired it up. Use case: I had a car audio amplifier under my rear hatch floorboard powering a subwoofer, I think it had far too many overheating cut-outs until it gave up. I replaced that with a larger amp to now power TWO subwoofers, one remained under the floor and the other is in the open area in the back. I installed a 12vdc brushless fan to blow on the underside of the amp, and when I first got everything running, I noticed the fan is a LOT louder than I had hoped, so I bought this temperature switch. I wired it up so that the power to the fan instead went to the temp switch, then the unit's switched leads supplied the (+) 12vdc to the fan. I changed the settings for this video to show what happens when setting "d" is at 2°F and the target temperature is 73°F ... The amp's temp slowly crept up to [Target]+[d] and the fan kicked on and I watched the temp drop to 72.8°F before the fan kicked off. I then let it cycle through one more time to 75°F, fan kicked on, temp continued to creep up to 75.2°F before starting to fall back down, to 72.8°F and fan turned off. That was proof enough that this thing does exactly what I intend, and I now have it set to kick on at 100°F and run until the temp probe reaches 94.9°F (target = 95° and d = 5). The only complaint I have is that the programming is a little convoluted. I did not explore any settings beyond Target, d, and mode = C (for cooling, opposite of H which is designed to switch on a heater to get temps up when the probe gets too cold). I will update this if the unit fails within the first year of use.

I use this to run some basic ventilation fans in an electrical closet and it works great. Hard to beat for the price.

This thing is exactly what I was hoping it was. I installed it as a cooling fan thermostat for my pickup. Of course, the internal relay shouldn't be loaded with an 80 watt fan, so I needed an additional relay to set everything up correctly. It reads down to tenths of a degree. The lead for the temperature probe that came with it was plenty long enough to run from inside the cab on the driver's side to the opposite side of the radiator. I wired it up as a ground side switch to reduce wire counts on long runs. I've probably used 5 "automotive" adjustable electric thermostats in as many years, one of each brand I could find. This setup has so far outlasted 3 of them. Doesn't seem to be as sensitive to voltage fluctuations, has a digital readout, and cost less than $20. Of course, this isn't meant to run an automotive cooling fan, and doesn't have an input for the A/C fan like the others do, and requires more complex wiring. Anyways, can be set to run a heater (on when cold, off when hot), a cooler (on when hot, off when cold) adjustable delta T, adjustable trigger temperature (whole degrees), and a warning for too hot/cold (flashing display, no sound). Also, it retains settings when disconnected from power. Update: 6-15-18 Still going strong, and I’ve had absolutely 0 problems. Works much better than everything else I’ve tried, and I only have it zip tied to the bottom side of the dash. Plenty enough vibration resistance.

This controller / meter controls a DIY solar hot water system. Two collectors, one regular 50 gallon hot water tank, an external heat exchanger and two 12 volt pumps. Purchased and installed two meters for redundancy in case one fails. Both meter controls both pumps. If one meter fails, the system will continue to function. One of the sensors arrived not working and the company quickly replaced it. Good seller. Very happy with these. Good flexibility, decent instructions, always know what is going on. One controller in the office and one by the water tank. Extended sensors as much as 70 feet with no loss of accuracy. I did not use shielded wire, and used 20 to 22 gauge wire (rigid) with no problems. I recommend this product.

I have one of the older Engel MT45 fridge/freezer that has only a turn knob to control the temperature. So, if the ambient temperature rises, the fridge temperature rises. So, I wanted to convert it to digital. I designed and 3d printed a housing for the thermostat and a LM2596S (fridge is dual voltage), and connected it to the side of the fridge. Setting it up was pretty straight forward. I set the heat/cooling mode to C for cooling, I set the temperature to what I wanted, and the delta to 01 for 1 degree. So, if I have the temperature set at 35, it kicks off the compressor at 34.9, and back on at 36. There is also a setting for a compressor delay, which I have set to 01. If I unplug the fridge while the compressor is running and plug it right back in, the compressor will not start for one minute. That can be set to zero if you don't want that.

Beware, the unit in the photo is accurate as of this writing, but the description is incorrect, has no second relay for heating at low temperature. Only has "Work" which kicks in the relay for cooling at a high temperature setting. Also no alarm can be heard or maybe mine is just broken? Can hear the high temperature relay kick in, adding my own alarm. Otherwise a nice simple unit that does work well.

I used this controller to replace a inaccurate refrigerator/freezer thermostat. The controller has all the features needed to achieve a perfect temperature. The differential is easily adjusted and my temperature has been perfectly within the 4 degree differential I set. The probe is very accurate for temperature readings. All settings and examples are included in the included user guide. Operation and wiring are simple. The price was very reasonable for such a quality product. I strongly recommend this controller!

Good instructions if you read schematics and understand basic electronics. (I you do not, don't buy this!) The output is for driving a relay coil or other simple LOW CURRENT circuit. Installed in a sheltered but unconditioned locker in a travel trailer, it has been running a water tank heater for months with no problems.

i am using to regulate the temp in my lithium battery housing, these are in a space that will go down to below 0