Off-Grid Solar Hot Water Pump 12/240V DC Power Supply or Battery
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Off-Grid Solar Hot Water Pump 12/240V DC Power Supply or Battery
plumbonline are pleased to announce the introduction of our "Off-Grid" Hot Water pump. The 12/24V DC Power supply hot water pump has been manufactured to the highest standards and has an array of features which facilitate multiple applications, giving you the flexibility of designing a true off grid hot water pumping solution. Whether you are using the pump for a domestic solar hot water system or running a hot water recirculation ring main in your house the "Off -Grid" has the control and power to ensure you have hot water where you need it.
The "Off-Grid" pump can also be supplied with sensor wires to control the circuits. When being used for solar hot water you can count on the controller to protect the solar collectors. The "Off-Grid" has a plug pack that can be connected to a 240V supply so even if you are running from a photovoltaic panel the solar hot water panels are protected as the pump which will circulate a small amount of water to prevent the collectors from freezing.
What do you get?
- One (1Qty) x Off-Grid Hot Water Pump 12/240V
- Economic and powerful with high efficiency
- Compact design, easy installation
- No plumb exudation, more safe
- Can sustain continual heavy duty work
- Low or no maintenance
- Whisper quiet operation
- Various protection functions
- DC power supply or battery is applicable
- Flow rate 25LPM at 24V DC is available
Solar Pump Circulation
- Normal operation - When a temperature differential between the collectors and the bottom of the hot water system is reached, the microprocessor will activate the circulation pump which will circulate the water through the system. The cooler storage tank water will pass up into the collectors and the warmer collector water will return into the storage tank. The pump will continue to run until the lower temperature differential is observed (See Chart for the pump on and off temperature differentials).
- Over-temperature mode - The processor shuts down to prevent the water in the storage vessel exceeding 76 degrees to prevent activation of the thermostat cut out and release of very hot water from the Pressure and Temperature Relief valve.
- Freeze protection mode - When the water in the collectors approaches 4°C the microprocessor will activate the pump which will circulate a small amount of water to prevent the collectors from freezing. Freezing water expands and this can lead to premature collector failure (due to a burst copper collector pipe). The micro processor will control the pump and maintain a temperature of 4 degrees in the collector to prevent the collector from freezing.
Hot Water Circulation
Maintaining hot water to your taps is commonly known as a Hot water recirculation system the pump can be used for this function.
- Normal operation - When a temperature below 30 degrees is detected the microprocessor will activate the circulation pump which will circulate the warm water through the system until 40 degrees is detected. The pump will draw warm water from the storage tank into the system and return the cooler water via the return line to the storage tank.
Electrical & Sensors Connections
Plug Pack (12V DC, 2 AMP) The plug pack must be connected to a constant 240V source located close to the unit and out of the weather. Ensure connection complies with all regulatory standards. The system MUST be full of water before the plug pack is powered to prevent damage to the pump. Damage caused from the pump operating without water is not covered warranty.
Collector Sensor (Yellow)
- The collector sensor (the long lead with yellow end marking) should be pushed all the way into the end of the sensor well in the uppermost section of the collectors. Once in sensor wire in position the end of the tube should be sealed with a small ‘dob’ of silicone sealant, this will secure the sensor wire and seal off the tube. Be careful not to damage or cut the cable or the system will not be able to measure the temperature in the collectors and fail to operate correctly. The solar collector sensor wire (yellow tagged) is connected to the yellow tagged connector protruding from the base of the pump and controller box.
Cold Sensor (Blue)
- The cold (the short lead with blue end marking) should be pushed all the way into the end of the cold sensor well. Once in sensor wire in position the end of the tube should be sealed with a small ‘dob’ of silicone sealant, this will secure the sensor wire and seal off the tube. Be careful not to damage or cut the cable or the system will not be able to measure the temperature in the cold section of the system. The cold sensor wire (blue tagged) is connected to the blue tagged connector protruding from the base of the pump and controller box. Be careful not to damage or cut the cable or the system will not be able to measure the temperature in the collectors and fail to operate correctly.
Direct Photovoltaic and Battery Backup Connection
- The recommended photovoltaic connection is via a battery back up system. The pump and controller are powered via the battery and the photovoltaic panels maintain the charge of the battery. . The system MUST be full of water before the controller is powered to prevent damage to the pump. Damage caused from the pump operating without water is not covered warranty.
- Direct Panel Connection The pump and controller can be directly coupled to a 12 volt regulated photovoltaic collector. This is not ideal connection method as there will be no frost protection or indication at night. The system will also regularly enter start up mode due to power fluctuations caused by cloud cover.
Features & Benifits
- Impeller - Highly efficient and dynamically balanced with fine ceramic bearing for smooth ultra quiet operation.
- Construction - Wetted parts are food grade stainless steel, food grade thermoplastic (Viton), carbon and ceramic for superior reliability and corrosion resistance.
- Dry-running protection - Drive circuitry can detect no or little liquid in pump chamber and will stop the pump to prevent damage, pump is then restarted manually by disconnecting and reconnecting it to the power supply.
- Over voltage protection - When the voltage over 28V, the pump will auto-protect and shut off own power supply, when the voltage falls below 28V, the pump will restart automatically.
- Over load protection function - This means that when the current is over the rated current, such as can arise if the impeller is stuck due to debris. The pump will automatically stop to prevent damage, and will restart when the current falls again.
- PV operated - For solar system loops, the pump can be powered directly from a PV panel. The sun comes up, heat builds in the solar hot water panel and at the same time electricity is made in the PV panel. The pump slowly starts with the smallest amount of current and pushes the heated water to the storage tank. It's all too simple and liminates all controllers, thermostats and sensors.
- Soft start-up - The DC pump has a soft start-up feature which reduces high in-rush current. When the photovoltaic panel provides sufficient power, the pump goes through the alignment phase by turning the rotor into the position required for start-up. The processor then waits until the capacitor is sufficiently charged. This enables a start-up with minimal power (less than two watt). Cycling due to unsuccessful attempts is minimized. Even after prolonged shutdown, the pump will start reliably.
- Over-temperature safety device - The DC pump comes with an integrated over-temperature safety device which shuts off the pump electronics when reaching temperature over 110°C (230°F). When the temperature of the pumped fluid is below 95°C (203°F) the pump will function normally. The temperature of the electronic components is influenced by the temperature of the pumped media as well as by the speed setting. After reaching a critical temperature 95°C (203°F) the pump will lower its speed automatically in order to avoid a total shutdown.
- Maximum Power Point (MPP) tracking - Every three seconds the processor will modify its operating point on the voltage-current curve of the PV panel to find the point of maximum performance. At this point, the pump achieves the maximum rpm and therefore the maximum performance. There is no need for a separate performance device. The eco solar pump will always find its best operating point under any given light and temperature conditions. By employing MPP tracking every three seconds, the pumps always automatically achieve maximum erformance at any given insolation.