Local Shutter InstallersSecurity · Survey
A motorised shutter in a power cut
Updated
A wired motor without a manual override can leave you shut in or shut out when the power fails. Solar systems have a battery, which is not the same as a guarantee you can open the door in a fire.
Sun, in watts
The worked opening for A motorised shutter in a power cut is 3.2 m wide by 2.1 m high, 6.72 square metres of glass. This figure puts 545 watts per square metre on the pane and uses a g-value of 0.63, about 2307 watts into the room if the curtain is up. An opaque external shutter, taken as stopping 80 percent of that gain while it is fully down, leaves about 461 watts and keeps about 1846 watts out. That is a noon figure for comparison. An internal blind does not get the same reduction. For A motorised shutter in a power cut, use the noon figure to compare two openings on the same house, then let a measured survey replace the figure.
An internal blind does not get that reduction, because the energy has already crossed the glass.
On this opening
Escape routes must not depend on a motor. If the shutter covers a door you need in an emergency, the override and the escape plan are the design.
The same glass in winter
Winter figure for A motorised shutter in a power cut: glass at 1.2 W/m2K, 6.72 square metres, a 12 degree inside-outside gap and eight night hours. The bare pane is about 0.77 kWh a night on that crude sum. A closed shutter cutting about 18 percent of the flow leaves 0.63 kWh and saves about 0.14 kWh a night, only while it is down. Open it when you want winter sun.
I would not order yet
Stop A motorised shutter in a power cut if the door is an escape route and the motor has no way to open when it is dead. A photograph is not a manufacturing size.
Cambridge is only a setting for A motorised shutter in a power cut. The streets there are not the product.
How to use the figure
The 3.2 by 2.1 metre opening inside A motorised shutter in a power cut is there so a quote has something to disagree with. If the tape gives a different size, the tape wins.
The example drive is a belt, and the illustration is £4,459. A belt, a wired motor and a solar motor can share a curtain and still be different jobs. Compare those lines, not a single bold total.
What the survey still has to write down
For A motorised shutter in a power cut, ask where the box lands, what colour reference will be ordered, and how the curtain opens when the motor is dead. Those three answers move the job more than a rounded price.
Leave the lantern, the side light and the next elevation off the order unless they are drawn. A motorised shutter in a power cut covers one kind of opening. The house may have three.
When I would not order yet
A motorised shutter in a power cut should wait if the opening is an escape door with no way to raise a dead motor, or if the front is the elevation a conservation area was drawn to protect.
A photograph is not a manufacturing size. Two quotes for A motorised shutter in a power cut only compare when the slat, the box and the drive are the same kind of thing.
Questions worth asking the fitter
Is the price on this page a quote?
No. £4,459 illustrates A motorised shutter in a power cut for a 3.2 by 2.1 metre opening with a belt, at September 2026 rates. Your survey replaces it.
Does the shutter cover every pane?
It covers the opening it is built for. Here that example is 6.72 square metres. A roof lantern, a side light or the next elevation is another line.
What if planning is unclear?
Do not pay the factory for A motorised shutter in a power cut until a listed building, a conservation front, a flat or a shopfront has a written answer. Ordinary rear walls on houses are sometimes simpler.
What should two quotes share?
The same openings, the same slat type, and the same drive. A motorised shutter in a power cut uses a belt in the example so you can see how much the motor choice moves £4,459.