Most motorised blinds specifications treat power as a single number. It is a distribution, and the width of that distribution is what your customer experiences after a year.
What power actually controls in motorised blinds
Battery avoids an electrician; hardwired avoids battery replacement.
That makes it a design decision rather than a purchasing one, which is why changing it after the product is fixed costs more than changing the material.
For Motorised blinds, the working range is Li-ion battery / 12 V DC / hardwired. Inside that band the choice is commercial; outside it, the product changes category and so does the price.
How to choose a power option
| Option | What it changes in motorised blinds | When it is the right choice |
|---|---|---|
| Li-ion battery | The lowest-cost option in the family. Motor stall on wide blinds is where it usually ends up. | Cost-led programmes with a short service life |
| 12 V DC | The volume middle: enough margin for process variation without paying for headroom the end product cannot use. | Most repeat programmes, and the safest default |
| hardwired | The top of the family, where the process is controlled tightly enough to guarantee it. | A warranty, a tender, or a specification that cannot be renegotiated |
These are alternatives, not points on a scale. Power is chosen by the application rather than by price, and a supplier who quotes one option as if it were interchangeable with another is quoting a different product.
The middle is where most programmes should sit, and it is the hardest position to defend in a price meeting because it has no story attached to it.
The figure that decides the outcome is not power itself but the tolerance around it. A supplier who quotes Li-ion battery / 12 V DC / hardwired without a tolerance has not quoted a specification, and the first lot will define the tolerance for you.
How to measure power
The reference method here is Operation noise, run to 1 m, anechoic or quiet room, with an acceptance of <= 35 dB. The method is the easy part; sampling and conditioning are where reports diverge.
Condition the sample before measuring. Results in this family move by 10-20 % between a dry laboratory and a humid one, and two labs can disagree on the same material without either being wrong.
Record the measured value rather than pass or fail. A marginal pass on power tells you the process is running at the edge, which is the information you need before the next lot rather than after it.
Power does not stand alone
Power moves with protocol (RF 433 / Zigbee / WiFi / Matter / Z-Wave) and with noise (<= 35 dB at 1 m). Tightening one usually costs money in another, and a supplier who accepts every tolerance without comment has either not understood the interaction or is planning to substitute.
When you change power, re-check the two neighbours before you approve the sample. Most of the samples we re-make are caused by a change in one figure that was not followed through.
The clause to write for power
The line below is the version we can quote against without inventing anything. Power appears with a tolerance and a test, not as a standalone number.
Motorised 50 mm basswood venetian blind, Li-ion battery, Zigbee 3.0, <= 32 dB, 2.0 Nm, electronic limits, manual override, 400 cycles per charge, EN 13120 safety
The clause that protects you is not the value, it is the sentence that says what happens when the value is missed. Put it in the purchase order, not only in the enquiry.
When power goes wrong
Motor stall on wide blinds. The blind stops halfway or hums without moving.
The cause is usually torque below what the blind weight and friction require.
The test that catches it: Measure running current at full load and compare against the motor curve.
What to specify instead: Size the motor to the widest blind in the range, not the average; add a margin for wooden slats.
None of this is visible in a quotation. It becomes visible in a retained sample and a lot record, which is why the paperwork matters more than the price on this parameter.
Four questions about power, before you order
- What tolerance do you hold on power, and what did your last three lots measure against it?
- Which method do you use for operation noise, and which laboratory signs the report?
- When power falls outside Li-ion battery / 12 V DC / hardwired, do you rework, downgrade, or ship and hope?
- Which of protocol or noise would you move first to hit a lower price?
The answers are more useful than a certificate, because they show whether the process is controlled or merely inspected. Full ranges for motorised blinds are on the product page, and the measurement regime is described on the quality control page.
Questions buyers ask before ordering
How many cycles will the battery really do?
300-500 on a 50 mm wooden blind, less on wide heavy blinds. We quote the tested figure and will send the cycle log; treat any figure above 600 with suspicion.
Can it work with Home Assistant?
Yes if you choose Zigbee or Matter. RF 433 needs a bridge and is not a smart-home answer, whatever the listing says.
Questions worth asking before the price is agreed
The questions below are the ones that cannot be answered from a catalogue, which is exactly why they are worth asking.
| Question | Answer that should worry you | Answer that holds up |
|---|---|---|
| Who signs the test report, and against which standard? | “Our QC department signs it.” | A named standard, a named method and a signature that belongs to somebody who can be asked again next year. |
| How do you hold limit setting at electronic with memory? | “That is standard for us, no problem.” | The last three lots’ readings, the instrument used and who signs the report. Battery drain starts here. |
| What happens if manual override misses the required requirement? | “It will not happen.” | A re-test clause, the tolerance on the re-test, and the point at which the lot is remade rather than discounted. |
Failure modes worth a clause in the purchase order
Claims rarely come from a batch that was obviously wrong. They come from a integration figure that sat inside the quoted band and outside what the product needed.
| Failure | What triggers it | Test to demand on the production lot |
|---|---|---|
| Battery drain | Friction in the headrail, or a motor with high standby current. | Operation noise — 1 m, anechoic or quiet room; acceptance <= 35 dB |
| Protocol incompatibility | Proprietary RF presented as ‘smart’, or a gateway that is not certified for the system. | Cycle endurance — 1000 cycles with load; acceptance position drift <= 2 mm |
The other two, with acceptance numbers attached, are in the full failure analysis for motorised blinds. A supplier who cannot name the mode he sees most often is describing a catalogue, not a process.
Need power specified and tested against your end use?
Send a window schedule or a single set size and we will return a quotation with the loading plan, the safety standard that applies to your market and the lead time for the colour you need. Catalogue and current price list on request.
Related reading
Catalogue and current price list · Neutral packing and private label · Consolidation, documents and lead times
