Solar mounting structures

Solar Panel Layout Planner, Pakistan

Solar quotations usually start with the system size, not the roof. Somebody arrives, says your roof will take a ten kilowatt system, and the layout gets worked out later, which is when the mumty, the water tank and the need to actually walk around for cleaning start removing panels from the plan.

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Built for Islamabad & Rawalpindi

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This planner works the other way round. You draw your roof by entering its size, add the obstacles where they really are, set the clearances you want, and it fits panels into what is genuinely left. The answer is often fewer panels than a sales conversation suggests, and knowing that before you sign is worth a great deal.

What This Tool Does

It draws a scale top view of your roof with the edge margin, your obstacles and their clearance zones, and the panels it can fit around them. It reports the panel count, the roof area, the area the panels cover, and gives you a survey checklist for the installer visit.

Who It Is For

Homeowners considering solar who want to know what their roof can really hold.
People comparing solar quotes where one proposes more panels than the roof looks likely to take.
Solar installers and structure fabricators wanting a quick feasibility sketch for a customer.
Anyone with a cluttered roof of tanks, stairs and parapets, which is most roofs in Pakistan.

How To Use It

Measure the roof, left to right and front to back. Pace it if you must, but a tape is much better.
Set the edge margin you want kept clear along every edge, for safety and for cleaning access.
Enter your panel size from the datasheet. A common 550 watt class panel is around 1,134 by 2,278 mm, but confirm yours rather than assuming.
Choose portrait or landscape. Trying both takes seconds and often changes the count.
Set the gap between panels side by side, and the gap between rows. On tilted frames the row gap is driven by shading, so use the figure your installer gives you.
Add each obstacle: the mumty, the water tank, a dish, a stair head. Measure their position from the front left corner of the roof.
Press the button to see the layout and the panel count.

Inputs And Units Explained

Roof width and depth — the usable roof rectangle. If your roof is an odd shape, plan the largest rectangle in it first.
Edge margin — clear space kept along every edge. Working right up to a parapet is neither safe nor practical.
Panel width and length — from the panel datasheet. Getting this wrong changes everything downstream.
Orientation — portrait puts the long side front to back; landscape turns it. Both are worth trying.
Gap between panels — a small gap side by side for clamps and expansion.
Gap between rows — walkway and shading space. Flat-roof tilted frames need considerably more than flush mounting.
Obstacle clearance — how much space to keep around each obstacle.
Obstacles — position from the front left corner, plus width and depth. Add one row each.

How The Calculation Works

The planner works inside a usable rectangle, the roof minus the edge margin on all four sides. Each obstacle becomes a blocked zone equal to its own footprint plus the clearance you set. Panels are then placed on a grid, row by row, at the panel size plus your gaps, and any position that overlaps a blocked zone is skipped.

This is pure two-dimensional geometry. It makes no judgement about roof strength, wind uplift, wiring routes, inverter sizing or energy yield, and it says so in the results. The row gap in particular is a shading decision that depends on tilt, latitude and the time of year you care about, which is why the tool asks you for it rather than guessing. The shadow and row spacing explorer works out that figure properly if you want it.

Worked Example

A 30 by 40 foot roof with a 10 by 8 foot mumty in the front left corner and a 6 by 4 foot water tank along the front edge, with the default 450 mm edge margin and 600 mm row gaps.

Input or result	Value
Roof	30 ft × 40 ft, about 1,200 sq ft
Panel	1,134 × 2,278 mm, portrait
Obstacles	Mumty 10 × 8 ft, tank 6 × 4 ft, each with 300 mm clearance
Edge margin	450 mm all round
Row gap	600 mm

The layout drops out as a count you can see on the drawing, with the obstacle zones shaded. Switching to landscape, or reducing the row gap after your installer confirms the shading allowance, changes the count immediately, which is exactly the conversation worth having before the structure is fabricated.

Features And Benefits

A scale top view of your own roof, with your own obstacles, rather than a generic layout.
Panel count that honestly reflects walkways and clearances.
Instant comparison of portrait against landscape.
A printable survey checklist so the installer visit covers what matters.
All of it in your browser, with nothing about your property sent anywhere.

Assumptions And Accuracy Limits

This is a geometric fit only. It does not assess roof strength, wind load, anchoring, wiring or energy output.
Row gaps for tilted frames depend on shading geometry. Use a properly calculated figure, not the default.
Obstacle heights are not modelled, so winter shading from a tall mumty or tank is not accounted for here.
Odd-shaped roofs have to be approximated as a rectangle, so a complex roof needs a site visit to plan properly.

Common Mistakes To Avoid

Forgetting walkways. Panels you cannot reach do not get cleaned, and dust in Islamabad and Rawalpindi takes a real bite out of output.
Using a guessed panel size. Get the dimensions from the datasheet of the panel actually being supplied.
Ignoring winter shadows. A tank that casts no shadow in June can shade a whole row in December. Check the geometry before fixing the layout.
Planning the roof around a system size. Work out what fits first, then decide the system size.

Solar Panel Layout For Pakistani Rooftops

Roofs in Islamabad and Rawalpindi are rarely a clean rectangle. They have water tanks, stair covers, parapet walls and satellite dishes, and each of those takes space or casts shade. Before asking for a solar installation, it helps to know how many panels your usable roof area can realistically hold.

Enter the usable roof dimensions, the panel size and the spacing, and the planner shows a layout and the length of structure needed. That gives you a sensible starting point for conversations with an installer.

Frequently Asked Questions

How many solar panels fit on a 10 marla roof?

It depends entirely on the usable rectangle and what is on it. A clear roof fits far more than one with a mumty, a tank and a stair head, and clearances for walking and cleaning take real space. Enter your own measurements rather than relying on a figure per marla, because that figure assumes a roof nobody has.

What gap should I leave between rows?

For flush mounting on a sloped surface, very little. For tilted frames on a flat roof, enough that one row does not shade the next during the hours that matter in winter, which is a trigonometry question rather than a rule of thumb. The shadow and row spacing explorer calculates it from your latitude, tilt and panel length.

Does this tell me what size system I can install?

Not directly, and deliberately so. It tells you how many panels fit. Multiplying by the panel wattage gives an indicative system size, but the real figure also depends on inverter sizing, wiring and your own consumption, which belong with the installer.

Does it check whether my roof can carry the weight?

No. Roof structure, anchoring and wind uplift are engineering questions that need somebody on the roof. The tool states this in its results and gives you a checklist for that visit instead of a false reassurance.

Can I upload a photo of my roof?

Not in this version. The planner works from measurements, which are more reliable than a photograph taken at an angle. If you have a roof plan, measure from it.

How many solar panels fit on a 5 marla roof?

It depends on the panel size, the tilt and the obstructions on the roof. A 5 marla roof has limited usable area once tanks and stair covers are excluded, so measure the clear area and enter it in the planner.

Do I need to leave gaps between solar panels?

Yes, for maintenance access and, when panels are tilted in rows, to avoid shading. The shadow spacing tool on this site helps decide the row gap.

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Get A Measured Quotation

A layout on paper becomes real once somebody stands on the roof and checks the slab, the access and where the cable will run. Ramzan Steel Works fabricates and installs solar mounting structures in Islamabad and Rawalpindi.