The DeltaSol® BX is equipped with 26 pre-programmed basic systems for a broad range of 1- and 2-store systems. Pre-defined functions facilitate system parameterisation. It features pre-programmed system layouts for a range of 2- and 3-store systems and special functions such as an extended priority and loading logic. With the integrated SD card slot, system data can easily be logged and transferred to a computer.


Solar controller for simple solar and heating systems, incl. SD card



  • 4 relay outputs and 5 Pt1000 temperature sensor inputs
  • 2 inputs for analogue Grundfos Direct SensorsTM (DeltaSol® BX)
  • 2 PWM outputs for the speed control of high-efficiency pumps
  • 26 basic systems to choose from (DeltaSol® BX)
  • For 2- and 3-store systems (DeltaSol® BX L)
  • Drainback option (DeltaSol® BX)
  • Thermal disinfection function, heat dump function
  • Unit °C and °F selectable


Inputs: 5 Pt1000 temperature sensors, 1 V40 impulse input, 2 Grundfos Direct Sensors™ (analogue)
Outputs: 3 semiconductor relays, 1 electromechanical relay and 2 PWM outputs
PWM frequency: 512 Hz
PWM voltage: 10.8 V
Switching capacity: 
1 (1) A 240 V~ (semiconductor relay) 
2 (1) A 240 V~ (standard relay)
Total switching capacity: 4 A 240 V~
Power supply: 100 ... 240 V~ (50 ... 60 Hz)
Supply connection: type Y attachment
Standby: 0.57 W (DeltaSol® BX)
Temperature controls class: I
Energy efficiency contribution: 1 %
Mode of operation: type 1.B.C.Y action
Rated impulse voltage: 2.5 kV
Data interface: RESOL VBus®, SD card slot
VBus® current supply: 35 mA
Functions: differential temperature controller with adjustable system functions. function control, operating hours counter for the solar pump, tube collector function, thermostat function, pump speed control, heat quantity measurement
Housing: plastic, PC-ABS and PMMA
Mounting: wall mounting, mounting into patch panels is possible
Indication/Display: System-Monitoring-Display for system visualisation, 16-segment- and 7-segment display, 8 symbols for indication of the system status and operating control lamp
Operation: 7 pushbuttons at the front
Ingress protection: IP 20 / IEC 60529
Protection class: I
Ambient temperature: 0 ... 40 °C
Pollution degree: 2
Dimensions: 198 x 170 x 43 mm

Resol DeltaSol BX Controller