A solar water heating pump controller is a key component in most solar water heating systems (DIY or otherwise). The controller is there to turn the pump on when the fluid in the solar panel is hotter than the water in the hot water tank (or swimming pool), and keep it turned off at all other times. First of all, it is worth noting that there are
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solar hot water system designs for which a controller is not required. The most common is Thermosyphon Solar Water Heating in which the natural rising of hot water (and sinking of cold water) is used to circulate hot water from the panel to the hot water tank, and cold water from the bottom of the hot water tank back around to the panel. It is also possible to connect a Photovoltaic Solar Panel directly to a low voltage pump - as long as the panel and pump have similar power ratings - so the pump only runs when the sun is shining. The problem with this is that early in the morning the pump may send the previous day`s hot water from the tank to be cooled through the still cold solar water heating panel, and in the evening when the panel may be hotter than the contents of the tank, the pump will not run. The preferred system for most is to fit temperature sensors to the outlet from the solar water heating panel and to the hot water tank, and have an electronic differential temperature thermostat decide whether the pump should be turned on. This is a solar water heating pump controller. Pictured above is the solar water heating pump controller we first started selling back in 2006 (and still sell here: basic solar pump controller to this day). It has also been made by many of our site visitors following the plans below. This circuit is made up of just a few components. Key are the two temperature sensors ( LM335Z ) which are...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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