Picture a shade on a garden wall, a pergola post, or a window with no outlet in reach. Powering it the usual way means conduit, a trench, or an electrician. The Simu T3.5 ESP Hz 3 Nm 23 rpm motor skips that work. Somfy builds it for the AutoSun system, where a 12V DC battery and a solar panel carry the whole load and a Hz radio remote sends the commands.
Somfy publishes reference 2009596 as the T3.5 ESP Hz 3Nm 23rpm 12V DC, model code T3.5DC ESP HZ 03/23 C1M/1. The motor runs on 12V DC and draws 0 W in standby. That standby figure earns its keep when a 2.2 Ah battery has to hold a shade through a week of grey weather.
The AutoSun chain holds four parts. A solar panel charges a NiMH battery. The battery feeds the motor through a Molex lead. A Hz remote on 433.420 MHz raises and lowers the shade. Somfy names two applications for the motor: exterior solar screens and interior window coverings.
Installers choose this platform for retrofits above all. An existing screen on a patio, a porch, or an outbuilding gains motorized control in an afternoon, with no permit and no new circuit.
Shades the 3 Nm T3.5 drives
3 Nm at 23 rpm puts this motor at the light end of the AutoSun range. Somfy builds the same platform in 6 Nm and 10 Nm for heavier fabric. The 3 Nm version fits light solar screen mesh and interior roller shades on 40 mm tube, where the finished roll stays small and the drop stays short.
23 rpm gives this motor the quickest travel of the three AutoSun models. A short screen clears the glass in seconds, which keeps the battery draw per cycle low.
Weigh the fabric and the tube before you order. A wide exterior screen in a dense mesh will ask for the 6 Nm or 10 Nm motor. Shade builders size by the torque the full roll demands at the start of a lift. Window width on its own will mislead you.
Verified specs for reference 2009596
| Specification | Value |
|---|---|
| Somfy reference | 2009596 |
| Model code | T3.5DC ESP HZ 03/23 C1M/1 |
| Torque / speed | 3 Nm / 23 rpm |
| Power supply | 12V DC |
| Standby consumption | 0 W |
| Control | Simu Hz radio, 433.420 MHz |
| Limit switch | Electronic |
| Head type | Round |
| Cable | 3.28 ft black lead, Molex connector |
| Protection | IP 44, Class II insulation |
| Applications | Exterior solar screens, interior window coverings |
| Warranty | 5 years |
Figures come from Somfy's published page for reference 2009596 and the Simu AutoSun brochure.
Tube, crown and drive fit
The T3.5 is a 40 mm class motor with a round head. Somfy lists a set of adaptors that seat it in the tube sizes shade fabricators use. The T3.5 38mm Round adaptor kit (9001495) carries the motor in 40 x 1 mm round tube, the most common choice for a light screen roller. Somfy also publishes a 40 mm octagonal crown and drive set, a crown adaptor for 40 x 1 mm round tube, and a drive for 40 x 1.5 mm round tube.
Stay inside the 40 mm family. Parts cut for 47 mm or 50 mm tube will not seat on a T3.5 crown, and a loose drive chews itself apart under load.
For bracket work, the Somfy Motor Plate (9012258) gives the round head a flat mounting face. Somfy calls it the R8 adaptor plate and lists it against this reference. Somfy also publishes a T3.5 flat mount bracket and a 10 mm square pin mount bracket for the idler end.
Battery, panel and charging
The motor needs a 12V DC source, and Somfy supplies one built for it. The 2.2 Ah NiMH AutoSun battery in an aluminum case (9020635) stores what the panel collects. Its 0.6 m lead is the longer of the two cased AutoSun 2 battery options Somfy publishes, which helps when the battery tucks into a headbox away from the motor head. Somfy lists this battery against all three T3.5 ESP Hz 12V DC motors and the AutoSun kits built from them.
A 3.2 W AutoSun solar panel handles the charging in service, and Somfy publishes a 16.5 ft extension cable for a panel mounted away from the shade. Mount the panel where it clears shadow for most of the day. A panel behind a soffit or under a tree will undercharge the battery no matter how little the motor draws.
Two moments call for a mains charge. A new battery arrives part-charged, and a long stretch of cloud can run one down. The Simu Battery Charger V2, NiMH US kit (9029465) covers both. Somfy lists it for every T3.5 ESP Hz 12V DC reference, motors and kits alike. Keep one on the truck if you install AutoSun systems in volume.
Check the connector generation on the parts you receive. Somfy publishes adaptor cables in both directions between V1 and V2 solar panels, batteries, and motors, which tells you the system has two eras of lead. Match the motor's Molex lead to the battery you pair with it before you close the headbox.
Hz radio control and the TaHoma switch
The receiver sits inside the motor on 433.420 MHz, the Simu Hz band. Nothing wires between a remote and this motor. An installer pairs a Hz transmitter, runs the limits through the motor's electronic limit routine, and the shade is live.
Somfy also lists the TaHoma switch as compatible with reference 2009596. That opens scheduling, sun and wind automation, and app control from a phone for a shade that has no power wire of its own. A solar screen that drops at noon and lifts at dusk on its own saves the owner the walk outside.
Electronic limits suit battery work. The motor holds its top and bottom positions in memory and stops without hunting, which spares the battery the extra travel a mechanical limit sometimes costs.
Order the motor with the parts around it
A complete AutoSun install needs the motor, a battery, a panel, and the crown and drive set for your tube. Order them together and you commission the shade on the first visit. The Somfy Simu T3.5 ESP Hz 3Nm 23rpm 12V DC AutoSun radio motor (2009596) is the motor at the center of that kit, and the parts above are the ones Somfy names for it.
Builders running heavier fabric should step up to the 6 Nm or 10 Nm T3.5 ESP Hz motor on the same battery, panel, and charger. The platform carries across all three, so a shop can stock one accessory set for the whole range.
Frequently asked questions
What torque and speed does the Somfy 2009596 motor deliver?
Somfy publishes reference 2009596 as the T3.5 ESP Hz 3Nm 23rpm 12V DC, model code T3.5DC ESP HZ 03/23 C1M/1. It delivers 3 Nm of torque at 23 rpm. That combination suits light exterior solar screen mesh and interior roller shades on 40 mm tube, with a short drop and a small finished roll.
Which battery and charger fit the T3.5 ESP Hz AutoSun motor?
Somfy lists the 2.2 Ah NiMH AutoSun battery in an aluminum case (9020635) and the Simu Battery Charger V2, NiMH US kit (9029465) for this reference. Both also cover the 6 Nm and 10 Nm T3.5 ESP Hz motors and the AutoSun kits, so one battery and charger pairing serves the whole 12V DC range.
What tube does the Simu T3.5 fit?
The T3.5 is a 40 mm class motor. Somfy publishes adaptors for 40 x 1 mm round tube, 40 x 1.5 mm round tube, and 40 mm octagonal tube, including the T3.5 38mm Round kit (9001495). Parts cut for 47 mm or 50 mm tube will not seat on a T3.5 crown, so stay inside the 40 mm adaptor family.
Can a TaHoma switch control this AutoSun motor?
Somfy lists the TaHoma switch as compatible with reference 2009596. Pairing it adds scheduling, sun and wind triggers, and phone control to a shade with no power wire. The motor keeps its built-in Hz receiver on 433.420 MHz, so a handheld Hz remote still works alongside the hub.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
