Programming the SR868C8Q controller

This video is designed to help you understand your controller and how it works, John
also explains how to program your controller and change the settings if required.

You will find this video most helpful if you have your copy of the controller manual with you to follow along, you can download a copy here.

If you can’t find the answer to your question please Contact Us.

Solar Electrics Controllers



  • Standard controller—recommended for most systems, features include;
  • Small discrete control console
  • Graphical LCD display
  • Overheat and frost protection
  • Time/temperature auxilliary heating controls
  • Heat metering
  • Holiday function



  • Will do all the SR868C8Q will do and more. For more complex systems we recommend this controller. With 12 different configurations to enable management of simple to complex systems. Features include;
  • Small discrete control console
  • Pool heating
  • Gas preheat
  • Central Heating
  • Wetback options
  • Managing 2 cylinders and 2 panels



  • For the ultimate in controller functionality with 50 configurations this controller is the best in the business, with all the features the SR618C6 has plus;
  • Up to 3 separate cylinders
  • Multi input multi output systems
  • Use of heat exchangers
  • Multiple pool configurations
  • Multiple central heating operations


SR81Q_Controller. The SR81Q Intelligent Solar Controller
for split pressurized solar hot water systems.

Old SR868C8Q updated version
Temperature measurement accuracy: 0.1C
10 push buttons at the front cover.
With separately keypad

1* Pt1000 temperature sensor
5* NTC10K, B=3950 temperature sensor
1* Grundfos Direct Sensor TM (VFS) analog input
1* FRT digital flow meter

1 * Semiconductor relay, Max current: 1A
2 * Electromagnetic relay, Max. Current: 2A
1 * Electromagnetic relay, Max. Current: 10A
1 * Low voltage relay for linkage with HR(on/off signal)
1* PWM frequency control output (0-10V)

Function: running time accumulation, tube collector function, timing heating function, pump speed control, thermal energy measuring, external heat exchanger, system parameters adjust, optional function adjust (menu), balance and diagnose function.

  • Power supply: AC100…240V ~(50…60Hz)
  • Rated impulse voltage: 2.5KV
  • Housing: Plastic ABS
  • Mounting: Wall mounting
  • Operation: 10 push buttons at the front cover
  • Protection type: IP40
  • Dimension of display: 120*120*18mm
  • Dimension of controller board: 200*140*43mm

Note: there are 5 inputs for NTC10K, B=3950 temperature sensor, but only 4 sensors are included in the standard delivery list; the other one should be purchased separately by customer if necessary.

PDF Downloads

SR81Q Owner’s Manual