Local Shutter InstallersMotors · Survey
When the solar battery is flat
Updated
Ask how you open the curtain if the battery is empty and you need the door. Some systems have a manual route and some do not.
Sun, in watts
The worked opening for When the solar battery is flat is 0.9 m wide by 2.35 m high, 2.12 square metres of glass. This figure puts 495 watts per square metre on the pane and uses a g-value of 0.7, about 735 watts into the room if the curtain is up. An opaque external shutter, taken as stopping 85 percent of that gain while it is fully down, leaves about 110 watts and keeps about 625 watts out. That is a noon figure for comparison. An internal blind does not get the same reduction. For When the solar battery is flat, 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
A rear door that is your everyday exit cannot be a puzzle. This is a survey question, not a footnote.
The same glass in winter
Winter figure for When the solar battery is flat: glass at 1.4 W/m2K, 2.12 square metres, a 12 degree inside-outside gap and eight night hours. The bare pane is about 0.28 kWh a night on that crude sum. A closed shutter cutting about 24 percent of the flow leaves 0.22 kWh and saves about 0.07 kWh a night, only while it is down. Open it when you want winter sun.
I would not order yet
Stop When the solar battery is flat 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.
Manchester is only a setting for When the solar battery is flat. The streets there are not the product.
How to use the figure
The 0.9 by 2.35 metre opening inside When the solar battery is flat 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 wired motor, and the illustration is £1,842. 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 When the solar battery is flat, 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. When the solar battery is flat covers one kind of opening. The house may have three.
When I would not order yet
When the solar battery is flat 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 When the solar battery is flat 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. £1,842 illustrates When the solar battery is flat for a 0.9 by 2.35 metre opening with a wired motor, 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 2.12 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 When the solar battery is flat 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. When the solar battery is flat uses a wired motor in the example so you can see how much the motor choice moves £1,842.