Wilo-Actun OPTI-QS


Fully autonomous and economical water supply through the use of solar energy
Simple electrical installation with integrated frequency converter without parameter input
Optimised water flow due to high hydraulic and motor efficiency and dynamic MPPT (Maximum Power Point Tracking - ensures solar panel operation at maximum power)
Plant configuration-oriented flexibility due to a wide output range
Superior longevity and reliability due to high quality materials and encapsulated motor construction
Additional operational reliability due to integrated safety devices

Wilo-Actun OPTI-MS - Autonomous, optimised water supply using solar power.

In arid, remote and off-grid regions, an uninterrupted water supply is a challenge. The new Wilo-Actun OPTI-MS, which is powered by solar energy, ensures an efficient and reliable water supply even in areas without power.


Multistage submersible pump in tie-bar version (QSI) or as an eccentric screw pump (QSH) for vertical or horizontal installation


  • Specifically designed for operation with photovoltaic modules
  • Water supply including drinking water from wells and cisterns
  • Household water supply
  • Watering and irrigation
  • Pressure boosting
  • For pumping water without long-fibre constituents and abrasive impurities


  • Fully submersible multi-stage pump
  • as a centrifugal pump in close-coupled design (QSI) or
  • as an eccentric screw pump (QSH)
  • With integrated check valve
  • With corrosion-resistant, encapsulated permanent magnet motor with water-glycol filling
  • Integrated frequency converter
  • Integrated software algorithm MPPT (Maximum Power Point Tracking) for use with solar modules

Scope of delivery

  • Submersible pump with power cable (2.5 m)
  • Epoxy cable gland with integrated water level sensor
  • Installation and operating instructions
  • Self-assembly hydraulics (QSH only) incl. installation instructions and mounting accessories

Model overview


Product designation Network connection Motor diameter DM Head max. Hmax Flow rate max. Qmax Rated motor power P2 Gross weight approx. m Article number
Actun Opti QSI4.06-04 - 90 mm 37.0 m 8.7 m³/h 0.48 kW 10.0 kg 6082885
Actun Opti QSH4.02-01 - 90 mm 60.0 m 3.0 m³/h 0.48 kW 13.0 kg 6082886
Actun Opti QSH4.01-02 - 90 mm 118.2 m 1.3 m³/h 0.48 kW 14.0 kg 6084593

Those. information

Explanation of the name

Example: Wilo-Actun OPTI-QSH4.01-02
Actun Product Series
OPTI Series Designation
QS Type designation
QS = Quick Solar
H Hydraulic design
H = eccentric screw pump
I = multistage centrifugal pump
4 Nominal diameter in inches
.01 Nominal volumetric flow in m & sup3; / h
-02 Number of steps

Technical Specifications

  • Operating voltage: 70 - 190 Vdc
  • Operating mode in immersed state: S1
  • Max. temperature of pumped liquid: 35 °C
  • Minimum motor flow speed: 0.2 m/s
  • Max. sand content: 50 g/m3
  • Max. immersion depth: 150 m
  • Protection class: IP68
  • Pressure connection: Rp 1¼ - Rp 1½


  • Casing of hydraulic part: stainless steel 1.4301 (AISI 304)
  • Impellers: stainless steel 1.4301 (AISI 304)
  • Hydraulic shaft
  • QSH: stainless steel 1.4401 (AISI 316)
  • QSI: stainless steel 1.4301 (AISI 304)
  • Motor housing: stainless steel 1.4301 (AISI 304)
  • Motor shaft: stainless steel 1.4057 (AISI 431)


Submersible pump as submersible centrifugal pump in close-coupled design (QSI) or as eccentric screw pump (QSH) for vertical or horizontal installation.

Hydraulic section

Multistage submersible centrifugal pump (QSI) with radial impellers in sectional design or as eccentric screw pump (QSH) with eccentric screw in double volute rubber stator. Built-in check valve. All parts in contact with the pumped liquid are made of corrosion-resistant materials.

Electric motor

AC type permanent magnet motor. Leak proof encapsulated stator with enameled windings, self-lubricating bearings, water-glycol mixture filling.

Frequency converter

Sealed frequency converter for direct operation with DC power supplies. Integrated software algorithm MPPT (Maximum Power Point Tracking) provides adaptation to available power to maximize water supply (dynamic MPPT).

Safety features:

  • Overvoltage protection device
  • Overload protection
  • Dry run protection (via built-in sensor)
  • Temperature control


The electric motor is cooled by the pumped liquid. The electric motor may only be operated in immersed state. The maximum temperature limits for the pumped liquid and the minimum flow speed must be observed. Vertical installation can be carried out with or without a cooling jacket - at the customer's choice. Horizontal installation is done with a cooling jacket.


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