Running power to a freestanding screen costs more than the shade. The Simu T3.5 ESP Hz 6Nm 18rpm 12V DC motor, Somfy reference 2009597, removes that cost from the job. It takes 12V DC from an AutoSun battery, carries a Simu Hz receiver inside the head, and drives a shade with no mains circuit and no control wiring.
Shades this motor drives
Exterior solar screens and interior roller shades sit at the top of the list. Somfy rates the motor at 6 Nm and 18 rpm, enough for mid-size screens on a 40 mm tube. Crews reach for it on patios, pergola screens, sunrooms and detached structures where line voltage would mean a trench or a conduit run. The motor asks for a battery, not a circuit.
ESP marks the solar-ready AutoSun build. A 2.2 Ah NiMH battery in an aluminum case feeds the motor through a Molex lead, and a Somfy solar panel keeps that battery charged across the season. Installers mount these on screens that face south or west, where the panel sees enough sun to cover a daily open and close.
Somfy lists two applications for ref 2009597: exterior solar screens, and interior window coverings. The 6 Nm rating lands in the middle of the T3.5 ESP Hz range, above the 3 Nm 23 rpm model and below the 10 Nm 12 rpm model, so it suits a screen that runs wider than a small bathroom shade without reaching awning weight.
Verified specs for ref 2009597
| Specification | Value |
|---|---|
| Somfy reference | 2009597 |
| Model designation | T3.5DC ESP HZ 06/18 C1M/1 |
| Torque / speed | 6 Nm / 18 rpm |
| Power supply | 12V DC, 9 V to 15 V |
| Rated current | 2.2 A |
| Power consumption | 26 W running, 0 W standby |
| Radio | Simu Hz, 433.420 MHz |
| Range, open field | 492.15 ft |
| Limit switch | Electronic, 54 turns |
| Repeatability | +/- 5 |
| Head type | Round |
| External diameter | 1.42 in |
| Minimum tube inner diameter | 1.57 in |
| Length, unwrapped | 18.66 in |
| Cable | RNF, 3 wires, 3.28 ft, black, Molex connector |
| Protection | IP 44, Class II |
| Operating temperature | -4 °F to 140 °F |
| Storage temperature | -4 °F to 140 °F |
| Certification | CE |
| Warranty | 5 years |
Every figure above comes from Somfy's published data for ref 2009597.
Tube fit, crowns and mounting
Measure the inside of the tube before anything else. Somfy sets the minimum inner diameter at 1.57 in, which is the 40 mm class. The motor body measures 1.42 in across, so it clears a 40 x 1 mm round tube with room for the crown to seat. A 38 mm tube will not take this motor.
The Somfy T3.5 38mm Round crown for 40 x 1 tube (9001495) is the matching part for that profile. The crown locates the head inside the tube and the drive transfers torque to the tube wall. Order both together with the motor, since a T3.5 crown set does not cross over from the 500 Series line.
Builders working with a 500 Series tube profile can bridge the gap with the 400 Series to 500 Series Crown and Drive Adaptor Kit (9013763). Somfy names ref 2009597 among the motors that kit serves and rates the kit to 13 Nm, which leaves headroom over this motor's 6 Nm.
The round head on 2009597 drops into a T3.5 bracket or onto the Somfy Motor Plate (9012258), which gives a flat face to screw into a headbox or a fascia. Plan the head end of the bracket around 18.66 in of motor length inside the tube.
Power comes from the Somfy Simu 2.2 Ah NiMH AutoSun Battery in an aluminum case (9020635). The 0.6 m battery cable meets the motor's 3.28 ft Molex lead, so the connection takes seconds and needs no stripping, no wire nuts and no junction box. Mount the case where a hand can reach it, because a battery swap at the end of a long season beats a ladder trip in bad weather.
The Somfy Simu Battery Charger V2, NiMH US Kit (9029465) handles the first charge and any mid-winter top-up when the panel sees short days. Charge the pack on the bench before the install so the first limit-setting session has full voltage behind it.
Hz radio control and range
The receiver sits inside the motor head on 433.420 MHz, the Simu Hz band. Somfy publishes an open-field range of 492.15 ft for ref 2009597. Walls, metal fascia and glazing cut that figure, so treat it as a ceiling rather than a working number. A screen on the far side of a masonry wall needs the transmitter in line of sight or a repeater in between.
Pairing follows the Simu Hz sequence from the motor's own instruction sheet. The motor answers a short power cycle or a brief button press on an already-paired transmitter, then accepts the new remote. Set limits after pairing, not before.
Simu states that Somfy RTS controls work with the Simu Hz motor range, AutoSun included. Confirm the transmitter in hand against that list before ordering, since the Hz band and the RTS band share 433.42 MHz but the protocols differ by product generation.
Limits, cycles and battery life
Electronic limits give this motor 54 turns of travel and a repeatability of +/- 5. Electronic limits hold their position through a power interruption, which matters on a battery motor that will see the pack run low at some point in its life. Set the top and bottom stops once and the shade returns to them.
The motor draws 2.2 A and 26 W while it runs, and 0 W at rest. Zero standby draw is the figure that makes solar charging work: the pack loses nothing between cycles, so the panel has only the running load to replace. Size the panel and the duty cycle around that. A shade that runs twice a day asks far less of the battery than one tied to a sun sensor that chases cloud cover.
IP 44 covers splashing water from any direction. Mount the motor inside a headbox or under a soffit on an exterior screen, and keep the battery case out of standing water.
Ordering the motor and the parts around it
The Somfy Simu T3.5 ESP Hz 6Nm 18rpm 12V DC Motor (2009597) ships as the motor alone. Build the order around it with the battery, the crown and drive set for the tube, and the charger. Somfy backs the motor for 5 years.
Two checks save a return. Measure the tube inner diameter and confirm 1.57 in or larger. Then confirm the control in hand speaks Simu Hz on 433.420 MHz before the motor ships.
Frequently asked questions
What tube does the Simu T3.5 ESP Hz 6Nm motor fit?
Somfy sets the minimum tube inner diameter at 1.57 in for ref 2009597, which is the 40 mm class. The motor body measures 1.42 in across. Pair it with the T3.5 38mm Round crown for 40 x 1 tube, or bridge to a 500 Series profile with the 400 to 500 Series adaptor kit.
How far does the Hz radio reach?
Somfy publishes 492.15 ft in open field on 433.420 MHz. Building materials reduce that distance. Masonry, metal fascia and low-e glass all absorb signal, so place the transmitter with a clear path to the motor head or add a repeater for a screen around a corner.
Does this motor need a solar panel?
The motor runs from the 2.2 Ah NiMH AutoSun battery. A solar panel keeps that battery charged in place across the season. Owners who prefer bench charging can run the Battery Charger V2 NiMH US Kit instead and swap the pack when it runs down.
What is the difference between the 6 Nm and the 3 Nm T3.5 ESP Hz motor?
Torque and speed. The 6 Nm model turns at 18 rpm and draws 26 W. The 3 Nm model turns at 23 rpm. Heavier fabric and wider screens call for the 6 Nm version, while a light interior shade runs well on 3 Nm at the faster speed.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
