Awning Motors and Controls: How to Size, Pair and Set Up a Tubular Motor
A retractable awning motor is a tubular motor that slides inside the roller tube and is sized by torque in newton-meters (Nm): most residential lateral arm awnings need 40-85 Nm, and very wide or four-arm units need 100-120 Nm. Beyond torque, the decisions that matter are the control protocol (one-way RTS, two-way io, or a smart-home radio such as Zigbee or Matter-capable bridges), how the end limits are set, and whether you can still crank the awning in when the power or the motor fails.
Key takeaways
- Undersized motors do not just run slowly: they stall on the final pull into the cassette, overheat and trip thermal protection. Size to the awning maker's chart, then add headroom.
- Typical sizing: up to about 13 ft (4 m) wide with two arms, 40-50 Nm; 13-20 ft (4-6 m), 50-85 Nm; four arms or projections over 11.5 ft (3.5 m), 85-120 Nm.
- One-way radio (RTS-type) is simple and reliable but cannot confirm the awning actually moved. Two-way radio reports position, which matters if you automate from an app or a sensor.
- Set the "in" limit so a cassette closes snugly without the motor straining, and the "out" limit so the fabric stays tight with a few turns left on the tube.
- Always specify a manual override (crank eye) on any awning wider than about 13 ft, or on any awning you cannot reach with a ladder in a storm.
How a tubular awning motor works
The motor is a sealed cylinder holding a motor, planetary gearbox, brake and limit switches. Its head is fixed to the end plate or cassette side cap; a drive adapter and crown engage the roller tube so the tube turns with the motor.
Three details govern what you can buy:
- Diameter. Common awning motors come in roughly 35 mm, 45 mm and 50-58 mm body sizes. The 45 mm class covers most residential awnings. The motor diameter must fit the inside of the roller tube (78 mm and 85 mm tubes are common on lateral arm awnings).
- Speed. Awning motors usually turn 12-17 rpm. Higher-torque motors are generally slower, which is fine: fast extension stresses the arm elbows.
- Duty cycle. Most AC tubular motors have thermal protection that cuts out after roughly 4 minutes of continuous running and needs 10-20 minutes to cool. A normal open or close takes 30-90 seconds, so this only bites when someone repeatedly runs it in and out, or when an undersized motor is laboring.
Battery and solar DC motors suit drop arm and small awnings; full lateral arm awnings still default to a hardwired 120 V motor (230 V in Europe).
Sizing motor torque in Nm
Torque is force times radius. On a lateral arm awning the force comes from the arm springs, which push the front bar outward and keep the fabric tight. To retract, the motor has to wind the fabric back against that spring tension, plus lift the front bar and fabric weight. The load is highest at the end of the close, because the fabric roll has built up to its largest diameter (bigger radius, more torque needed for the same tension) and the arms are folded with their springs most compressed.
| Width | Projection | Typical motor torque | Notes |
|---|---|---|---|
| Up to 10 ft (3 m) | Up to 8 ft (2.5 m) | 30-40 Nm | Drop arm and small open awnings may run on 10-20 Nm |
| 10-13 ft (3-4 m) | 8-10 ft (2.5-3 m) | 40-50 Nm | Most common residential size |
| 13-16 ft (4-5 m) | 10-11.5 ft (3-3.5 m) | 50-70 Nm | Heavier arms raise spring tension |
| 16-20 ft (5-6 m) | 11.5-13 ft (3.5-4 m) | 70-85 Nm | Check roller tube deflection too |
| 20 ft+ (6 m+) or 4 arms | Any | 85-120 Nm | Often coupled units with two motors or a center support |
Use these as a sanity check, not a spec. The awning manufacturer's chart is the authority because it knows the spring rating of its arms and the tube diameter. Replacement motors are where people get caught out: the original motor label shows the torque, and you should match or exceed it.
Oversizing has a cost too: a 120 Nm motor on a light awning has the strength to tear fabric or bend the front bar if something jams.
Control protocols: RTS, io and smart-home radios
The motor's radio receiver (or the external receiver wired to a plain motor) decides how you control it. This is a decision you live with for the life of the motor, often 10-15 years, so pick for compatibility, not just the remote that comes in the box.
| Option | Direction | Strengths | Limitations |
|---|---|---|---|
| Hardwired switch | n/a | No batteries, no pairing, nothing to lose | Needs a cable to the switch location, no automation without extra modules |
| RTS (Somfy, 433.42 MHz) | One-way | Huge installed base, many compatible remotes, sensors and bridges, very simple | Remote cannot confirm the awning moved or show its position |
| io-homecontrol | Two-way | Motor confirms commands and reports position, better for app control and scenes | More common in Europe, fewer compatible third-party products in the US |
| Zigbee motors or receivers | Two-way mesh | Works with common smart-home hubs, position feedback | Depends on the hub, pairing and range vary by home |
| Matter (via bridge or native) | Two-way | Cross-ecosystem control from major voice and phone platforms | Awning-specific features (sensor logic, intermediate positions) may not be exposed |
A practical rule: if you only ever want a remote and a wind sensor, one-way RTS-type control is the most proven option and has the widest choice of sensors. If you want to open the awning from a phone while away and know it actually opened, choose two-way. Opening an awning remotely with no position feedback is how awnings get left out in a storm.
Mechanical vs electronic limits
Mechanical limits are set with two screws on the motor head, one per direction. Electronic motors store limits in memory, set from the remote, and often add soft start and stop plus a cassette "tension" feature that backs off slightly after closing so the motor is not stalled against the housing.
Setting the end limits correctly
Bad limits cause more service calls than bad motors. Each manufacturer's sequence is different, so follow its manual, but the targets are the same.
- Confirm direction first. Press "up" and check the awning closes. If it opens, reverse direction before setting anything, or every limit you set will be backwards.
- Set the closed (in) limit. On a cassette awning, stop when the front bar meets the cassette and seals with light contact. You should not hear the motor labor or see the cassette lid flex. On an open awning, stop when the front bar is snug under the hood or against the stops.
- Set the open (out) limit. Run the awning out until the arms are almost straight and the fabric is taut. Stop with at least one and a half to two full wraps of fabric still on the tube. If the fabric unwinds to the tube, the glued or keder joint carries all the load and the fabric can wind backwards on the next close.
- Check fabric tension at full extension. Fabric should be tight with no belly. Slack fabric at the out limit holds water and flaps in wind. If it sags, bring the out limit in slightly; the arms will hold tension.
- Set a favorite or intermediate position. Most electronic motors allow a "my" or preset position. A two-thirds-out setting is useful for wind-sensitive days.
- Cycle three times and recheck. Fabric beds in, so recheck the in limit after a few weeks of use.
Manual override: why it matters
A manual override motor has a hexagonal or eyelet socket in the motor head. A crank rod hooks into it and turns the motor's gearbox directly, bypassing the electrics. It costs a modest amount more than a standard motor and is the single cheapest insurance you can buy on a motorized awning.
Without it, a dead motor, a tripped breaker or a failed receiver with the awning extended means the awning stays out until someone can unbolt the fabric tube or replace the motor. With wind coming, that can mean a bent arm or a torn fabric before help arrives. Override is particularly important for:
- Awnings over about 13 ft (4 m) wide, where a stuck awning has a lot of sail area
- Second-story or roof-mounted awnings you cannot easily reach
- Vacation homes and rentals where nobody is there to react
- Areas with frequent power cuts during summer storms
Crank slowly, stop at the limits by eye (cranking past a mechanical limit can damage the switch), and never crank against a motor that is being driven electrically at the same time. If an awning will not close at all, work through what to do when an awning will not retract.
Wiring, receivers and where things fail
A 120 V awning motor draws only about 1-2 A, so it can usually share an exterior circuit. Use wet-location wiring, a weatherproof junction box near the motor end, and a drip loop so water drips off before reaching the motor head.
Typical failures: weakened capacitors (slow, hesitant running), external receivers mounted outdoors, and water entering at the cable gland on unhooded awnings. For diagnosis, see awning motor troubleshooting; for expected service life, see component lifespans.
If you are still deciding whether to motorize at all, motorized vs manual awnings covers the trade-offs, and the awning cost estimator shows how motors and sensors move the price.
Frequently asked questions
Can I add a motor to a manual crank awning?
Often yes, if the roller tube diameter accepts a tubular motor and the awning end plate can take a motor head bracket. Conversion kits exist for many common awnings. You will need power at the motor end, and you should size the motor torque to the awning, not to the kit's default.
What happens if my awning motor is too weak?
It will slow down or stall near the end of the close, overheat and cut out on thermal protection, then refuse to run for 10-20 minutes. Repeated stalls shorten motor life. The fix is a higher-torque motor, not a limit adjustment.
Can one remote control several awnings?
Yes. Multi-channel remotes can address each awning separately or as a group. With one-way radio you will not get confirmation that all of them moved, so check visually when wind is a concern.
Do awning motors work with voice assistants?
Yes, through a bridge or hub that speaks the motor's radio protocol, or with native Zigbee or Matter-capable motors. Keep wind retraction local to the sensor and motor rather than depending on voice or app automations.
How long does an awning motor last?
A quality tubular motor in a protected position commonly lasts 10-15 years or more. Exposure to water at the head, frequent stalling and repeated thermal cutouts are the main reasons motors die early.
Why does my awning stop a few inches short of closing?
Either the closed limit has drifted, the fabric has stretched or shifted on the tube, or the motor lacks torque at the end of the close. If it stops at a consistent point with no strain, reset the limit. If it slows and labors first, look at torque or the capacitor.
Sources and standards consulted
- EN 13561:2015, External blinds and awnings: performance requirements including safety (CEN)
- Somfy and other tubular motor installation and programming guides (manufacturer documentation)
- Manufacturer installation manuals for lateral arm, drop arm and cassette awnings (manufacturer documentation)
- International Residential Code (IRC), structural attachment and fastening provisions (ICC)
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