For Professionals
Find installers now!
Get free local quotes
Cut your energy costs
Improve your home's value
  • Projektdaten
  • Angebote
Project Type
Please fill out this field
Please fill out this field
Area to be heated
Please fill out this field
Type of Solar Thermal
Please fill out this field
Your Utility Company
Please fill out this field
Avg. Monthly Electric Bill
Please fill out this field
Property Type
Please fill out this field
Type of Area
Please fill out this field
Choose the status of your project
Please fill out this field
Wann soll das Projekt umgesetzt werden?
Ein Zeithorizont unterstützt den Fachbetrieb bei der Auftragsplanung
Please fill out this field
21 Angebote gefunden, bis zu 22% günstiger als der Durchschnitt.
5 Contractors in your region!
Complete your request to receive free local quotes
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
    Please fill out this field
    • Sichere Übermittlung durch SSL Verschlüsselung
    • Automatische Löschung Ihrer Angaben nach Projektende
    • Angaben werden nur an ausgewählte Anbieter weitergeleitet
    Sehr gut (Ø 4.6/5)
    16.144 Bewertungen
    Aktuelle Bewertung
    Fachkenntnisse, Kundenfreundlichkeit, Interessenberücksichtigung, Beratung alles super, alles top.
    Nutzer aus Hamburg
    60 Minuten seit letzter Anfrage
    12 Anfragen heute
    613.933 Anfragen insgesamt
    3 min. left

    PV Powered & Differential Controller

    A solar controller is necessary for regulating an active solar hot water system and to ensure proper functioning. The controller controls the circulation of the pump, causing the pump to circulate when the collectors are hotter than the storage tank so that heat is transferred to the storage unit and causing the pump to stop when the reverse is true to prevent heat loss from the storage unit.
    Find the right installer
    • Find Licensed Contractors in your Area
    • Receive up to 5 Offers from Contractors
    • Guarantee Best Price, No Fees and Without Obligation!

    Solar ControllerImage: © RESOLThe solar controller is a special electronic device used to control the circulation of the pump in a solar water heating system so as to harvest maximum heat while protecting against overheating. The solar controller protects the system by turning off the pump when water in the storage tank reaches maximum temperature. There are two main types of solar controllers in the market: PV-controlled pumps and differential controllers.

    PV-controlled Pumps

    This type of solar controller uses a solar panel connected directly to the pump. The pump operates when there is sunshine and its speed will depend on the intensity of the sunlight.

    Differential Controllers

    A differential controller is a special type of thermostat that is used to measure two different temperatures simultaneously. The term ‘differential’ comes from the fact that the thermostat measures the temperature difference between two locations. A differential controller is a kind of solar controller that turns the solar collector on or off depending on the changes in temperature at the two locations. The controller monitors the thermostat's two sensors on a constant basis. One sensor in the differential controller is placed on the piping as close to the solar collector’s outlet as possible, while the other sensor is located close to the storage tank’s bottom.

    The collector heats up rapidly when the sun rises, which makes the sensor change its resistance. This activates a relay in the solar controller and turns on the pump. When the storage tank reaches its  maximum temperature or the sun cools down, the ‘differential’ between the sensors becomes minimal, prompting the thermostat to turn the pump off. A differential controller may either work with the factory pre-sets or user-defined settings. It measures resistances of the two sensors and then turns the pump either on or off depending on the difference between the two.

    A solar controller is not required in either a batch heater system or thermosyphon system, as they are not systems with an active circulation which would need to be controlled. In the former system, water pressure is used to move energy while the latter system uses the natural rise of heat.

    We find the company that suits to your needs
    • More than 6.000 Licensed Contractors
    • Get Informed, Compare Prices and Get the Best Offer
    Written by: Christian Märtel, Editor