Where to Buy Blind Motors for Roller Shades: Details & Label Check

Where to buy

Shade dealers and fabricators sell branded tubular motors, such as Somfy. Some dealers hide prices behind trade accounts. Online marketplaces carry retrofit kits for DIY conversions.

Professional insight

Shade installers size the motor to the tube and load first. Brand and app come after that.

Check the tube's inside diameter, not only its outside.
Weigh the bottom bar into the load.
Step up one torque size for battery shades.
Confirm the remote protocol matches your hub.

Check the label

Motor head diameter in mm, such as 35, 40 or 50.
Minimum tube internal diameter listed.
Torque rating in Nm.
Speed in rpm.
Supply voltage, DC or AC, matches your power source.
Control type: wired switch, radio remote or smart hub.
Included adapters, crown and drive for your tube profile.
IP rating for exterior or damp rooms.

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Types

Battery

Rechargeable pack, no wiring. Best for retrofits and rentals.

Low voltage DC

Runs from a plug-in adapter or power supply. Common for smart shades.

Line voltage AC

Hardwired at 120 V or 230 V. Suits large or heavy shades.

Retrofit kit

Motor plus adapters for an existing roller. Tube size must match.

Sizing

1Measure the fabric width, not bracket to bracket.
2Measure full drop from open to closed.
3Find the fabric weight per square meter or yard.
4Add the hem bar and any slats or magnets.
5Note the tube's outer and inner diameter.
6Apply a safety margin, then pick the next motor size up.

Typical torque margins by shade type
Shade type	Margin
Interior roller	1.5x to 1.8x
Cellular	1.7x to 2.0x
Roman	1.9x to 2.3x
Exterior screen with wind bar	2.1x to 2.6x

Blind motor spec example

Somfy Sonesse 50 torque: 15 Nm; Wired, 17 rpm.
Head diameter: 50 mm; Needs a tube of at least 47 mm inside.
Protection: IP44; Interior use, 230 V 50 Hz version.

Red flags

Listing gives torque but no tube diameter.
Plug or voltage made for another country.
No adapters shown for your tube profile.
Remote sold separately but not mentioned clearly.
Brand-name motor far below dealer pricing.

Common questions

Can I motorize my existing roller blind?: Often yes, if a retrofit motor fits your tube. Measure its inside diameter first.
What happens if the motor is too weak?: It may slow, lose its limits or wear out early. Size up instead.
Do smart blind motors need a hub?: Some use Wi-Fi directly. Others need a bridge for Zigbee, Z-Wave or radio remotes.