A window with no outlet near it used to mean a corded shade. The Somfy Roll Up 28 WireFree RTS V2 removes that limit. Somfy builds the rechargeable lithium-ion cell inside the 28 mm motor body, so nothing hangs off the headrail. No battery wand. No cable running down the jamb, and no transformer plugged into a baseboard outlet.
This guide covers the shades the motor drives, the tube and crown parts it needs, the specifications Somfy publishes for reference 1241150, and the charging and control path that follows the install.
The shades this motor moves
Somfy rates the Roll Up 28 WireFree RTS V2 at 1.1 Nm and 20 rpm. That output suits interior fabrics on small and mid-size tubes: roller and solar screens, Roman shades, woven woods, sheer horizontals, zebra and layered shades, pleated shades, and cellular shades. On most jobs the 28 mm diameter decides the specification before the torque does. A 28 mm body drops into a 1.25 inch or 1.5 inch tube where a 40 mm or 50 mm motor never fits, and that is the whole reason this motor exists.
Exterior openings belong to a different Somfy motor. The Roll Up 28 carries an IP 20 rating and Class III insulation, which places it indoors. Bedrooms, offices, kitchens, and stairwell windows all qualify. Patios and awnings need a Sunea or Orea instead.
Tube fit and the crown and drive decision
The motor alone does not fill a tube. A crown centers the motor body inside the tube, and a drive transfers rotation to the tube wall. Somfy publishes crown and drive sets for Acmeda, Hunter Douglas, Louvolite, RollEase, Silhouette, Vignette, and Shangri-La hardware, so the correct pair depends on the tube profile in front of you rather than on the motor.
Two sets cover most of the work that lands on this motor. The Somfy R28 Crown & Drive Kit for Silhouette and Hunter Douglas tubes (9025816) handles retrofit work on existing Hunter Douglas hardware, which is where a battery motor earns its keep. Retrofits rarely have an outlet waiting. For RollEase tubes on the small end, the Somfy RollEase 1.25 inch Crown & Drive (9025815) matches the 1.25 inch profile that a 28 mm motor was sized for.
Measure the inside diameter of the tube before you order either one. Outside diameter marketing numbers and inside diameter reality differ by the wall thickness, and a crown that binds costs you a service call.
Verified Somfy specifications
Every number below comes from Somfy's own published data for reference 1241150.
| Specification | Value |
|---|---|
| Torque | 1.1 Nm |
| Speed | 20 rpm |
| Power supply | 12V DC, embedded lithium-ion battery |
| Rated current | 1.1 A |
| Consumption, operating | 0.269 W |
| Consumption, standby | 0.001 W |
| Radio frequency | 433.420 MHz (RTS) |
| Channels | 12 |
| Range, open field | 656.2 ft |
| Noise level | 54 dB |
| Protection index | IP 20 |
| Insulation class | Class III |
| Limit switch | Electronic, 200 turn capacity |
| Repeatability | +/- 10 |
| Working temperature | 32 to 140 degrees F |
| Thermal cutoff | 4 minutes |
| Certifications | CE, SASO |
| Warranty | 5 years |
The standby figure of 0.001 W deserves a second look. A motor that idles at one milliwatt spends almost its entire charge on movement rather than on listening for a remote, and that is the engineering that makes an embedded battery practical in a 28 mm body.
Charging the motor and keeping it topped off
Somfy charges the Roll Up 28 through a removable cable at the motorhead, so the shade stays hung and the tube stays in its brackets. The Somfy WireFree Li-ion Plug-in Charger (9025166) is the charger to keep in the truck and to hand the homeowner at close-out. Order one per household, not one per shade.
High shades change the calculation. Climbing a ladder twice a year to reach a charging port wears thin fast, and the Somfy Magnetic Adapter for Li-ion Motors (9028562) answers that by giving the charge cable a magnetic connection at the motorhead. The homeowner touches the lead to the port instead of aligning a plug overhead.
The redesigned V2 motorhead carries an LED low-battery indicator, so the shade tells you it needs a charge before it slows down. Charge a new motor before you set limits. A partial charge out of the box will get you through programming and leave the customer with a shade that wants attention in a week.
RTS control and the TaHoma path
The receiver sits inside the motor, which means no separate radio module and no control wiring anywhere in the assembly. Somfy publishes 433.420 MHz, 12 channels, and 656.2 ft of open field range. Real walls cut that figure, though a single-family home rarely tests it.
Any Somfy RTS control drives this motor. A Situo handheld covers one shade or a small group. A DecoFlex wall switch gives the room a fixed control point that never goes missing in a sofa cushion. Adding a TaHoma hub brings the shade into the app, onto schedules, and under voice control, and the MY button holds a favorite intermediate position that both the remote and the app can call.
Setup notes installers ask about
Limits are electronic, with a 200 turn capacity and a repeatability of plus or minus 10. Set them from the RTS remote using the Somfy pocket programming sequence rather than from a mechanical adjuster, since this motor has none. The programming button sits recessed in the V2 motorhead, which stops a bumped headrail from dropping the motor out of pairing.
Thermal protection cuts the motor after four minutes of continuous running. Bench testing a long cycle can trip it, and the motor resumes after it cools. Working temperature runs from 32 to 140 degrees F, so a west-facing window behind glass stays inside the envelope.
Order the crown and drive set with the motor. A 28 mm motor sitting in a box while the crown ships separately is the most common reason a battery shade misses its install date.
Shade Motors Direct stocks the Somfy Roll Up 28 WireFree RTS V2 (Li-ion), reference 1241150, with the crown and drive sets, the charger, and the magnetic charging adapter alongside it. Pair the motor with the tube hardware in the same order and the shade goes up in one visit.
Frequently asked questions
What tube size does the Somfy Roll Up 28 WireFree RTS V2 fit?
The motor body measures 28 mm, which fits 1.25 inch and 1.5 inch roller tubes with the matching Somfy crown and drive set. Somfy publishes sets for Acmeda, Hunter Douglas, Louvolite, RollEase, Silhouette, Vignette, and Shangri-La tube profiles. Measure the tube inside diameter, then order the crown and drive that matches that profile.
How much torque does the Roll Up 28 WireFree RTS V2 produce?
Somfy publishes 1.1 Nm at 20 rpm for reference 1241150. That output covers interior roller and solar screens, Roman shades, woven woods, sheers, zebra shades, pleated shades, and cellular shades on small and mid-size tubes. Heavier fabric on a wide opening calls for a larger Somfy motor such as the Sonesse 40 or Sonesse 50.
Can the Roll Up 28 WireFree RTS V2 go outside?
Somfy rates the motor IP 20 with Class III insulation, which covers interior openings. Kitchens, bathrooms, and sunrooms behind glass all work. Exterior awnings, patio screens, and rolling shutters call for a weather-rated Somfy motor such as the Sunea CMO RTS or the Orea RTS.
Does the motor work with TaHoma and voice control?
Yes. The Roll Up 28 WireFree RTS V2 runs on Radio Technology Somfy at 433.420 MHz with 12 channels, so a TaHoma hub picks it up as an RTS product. TaHoma adds app control, scenes, sunrise and sunset schedules, and voice assistant integration. The MY position stays available from the handheld and the app.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
