Wilo-Actun OPTI-MS


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
Easy remote access to operating parameters and settings for the solar submersible pump via the Solar Connect tool in the Wilo-Assistant
Push notifications for operating mode changes

The Wilo-Actun OPTI-MS is an autonomous and optimized solar water system.

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 motor pump in tie-bar version (MSI) or as eccentric screw pump (MSH) for vertical or horizontal installation


  • Specifically developed 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 sectional design (MSI) or
  • as an eccentric screw pump (MSH)
  • 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 solar module applications
  • Pre-installed signal cable for direct connection of signal sensors (e.g. float switch)

Scope of delivery

  • Submersible pump with power cable (2.5 m)
  • Epoxy cable gland with integrated water level sensor
  • Installation and operating instructions
  • Submersible self-assembly part (MSH only) including mounting instructions and accessories
  • Adapter for pressure connection 1½" to 2" (only OPTI-MSI4.08-... types)

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 MSH4.02-02 1~230 V, 50/60 Hz 90 mm 100.0 m 3.0 m³/h 1.10 kW 21.5 kg 6082887
Actun Opti MSI4.05-08 1~230 V, 50/60 Hz 90 mm 128.0 m 7.6 m³/h 2.20 kW 24.0 kg 6082889
Actun Opti MSI4.08-03 1~230 V, 50/60 Hz 90 mm 49.5 m 11.2 m³/h 1.10 kW 21.4 kg 6082890
Actun Opti MSI4.08-05 1~230 V, 50/60 Hz 90 mm 82.5 m 11.2 m³/h 2.20 kW 23.0 kg 6082891
Actun Opti MSI4.05-04 1~230 V, 50/60 Hz 90 mm 64.0 m 7.6 m³/h 1.10 kW 21.0 kg 6082892
Actun Opti MSH4.01-03 1~230 V, 50/60 Hz 90 mm 229.9 m 1.4 m³/h 1.10 kW 21.5 kg 6084592

Those. information

Explanation of the name

Example: Wilo-Actun OPTI-MSH4.02-02
Actun Product Series
OPTI Series Designation
MS Type designation
MS = Multipower Solar
H Hydraulic design
H = eccentric screw pump
I = multistage centrifugal pump
4 Nominal diameter in inches
.02 Nominal volumetric flow in m & sup3; / h
-02 Number of steps

Technical Specifications

  • Operating voltage: 90 to 265 VAC or 90 to 400 VDC
  • Operating mode in immersed state: S1
  • Max. temperature of the 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 2


  • Casing hydraulic section: stainless steel 1.4301 (AISI 304)
  • Impellers: stainless steel 1.4301 (AISI 304)
  • Hydraulic shaft
  • MSH: stainless steel 1.4401 (AISI 316)
  • MSI: 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 (MSI) or as eccentric screw pump (MSH) for vertical or horizontal installation.


Multistage submersible centrifugal pump (MSI) with radial impellers in close-coupled design or as eccentric screw pump (MSH) with eccentric screw in double volute rubber stator. Built-in check valve. All parts in contact with 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 and AC 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


Electric motor is cooled by the fluid being pumped The motor may only be operated in immersed state. Maximum temperature limits for the pumped liquid and 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.


Wilo-Actun OPTI-MS#Wilo-Actun OPTI-QS Download
Wilo-Actun OPTI-MS... Download
Documentation Download



More in this category:

Need a consultation?

We will tell you in detail about our services, types of work and typical projects, calculate the cost and prepare an individual offer!