Solar mounting structures
L1, L2, L3 Solar Structure Comparison
L1, L2 and L3 are market conventions, not engineering standards. They broadly describe how elevated and how heavy a structure is, and beyond that they mean whatever the vendor using them intends. Two quotes both marked L2 can differ by half the steel.
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This comparator ignores the label and compares what is specified underneath it: section sizes, finish, anchoring, fasteners and warranty, alongside the price per kilowatt and per panel.
What This Tool Does
It lays two or three structure quotes side by side with price, price per kilowatt and price per panel, and a row for each specification item showing which vendor has confirmed it. It then lists the questions that separate a well-specified structure from a cheap one.
Who It Is For
- Solar customers choosing between structure quotes.
- Installers explaining to a customer why one structure costs more.
- Fabricators benchmarking their own specification against the market.
How To Use It
- Enter the system size in kilowatts and the number of panels, so the prices become comparable.
- For each quote, enter the vendor name, the label they used and the structure price.
- Tick the specification items each vendor has actually put in writing.
- Compare, then take the question list back to each of them.
Inputs And Units Explained
- System size and panel count — used only to convert prices into per-kilowatt and per-panel figures.
- Vendor, label and price — the label is recorded but never treated as a specification.
- Specification checkboxes — nine items covering member sizes, elevation, finish, anchoring, waterproofing at anchor points, fastener type, wind-load consideration, warranty and whether installation and transport are included.
How The Calculation Works
Prices are divided by your kilowatt and panel figures to give comparable rates. Every specification item is shown as confirmed or unknown, with no scoring and no ranking. The tool deliberately refuses to map L1, L2 or L3 to any capacity or steel weight, because no such mapping exists as a standard.
Worked Example
Two quotes for the same ten kilowatt system with eighteen panels, one noticeably cheaper.
| Input or result | Value |
|---|---|
| Both prices | Shown with price per kW and per panel |
| Specification | Confirmed items counted per vendor |
| Typical gap | The cheaper quote often has member sizes and finish unstated |
Once both vendors state section sizes and finish in writing, the comparison usually becomes straightforward, and sometimes the cheaper quote turns out to be the same structure at a better price.
Features And Benefits
- Treats the L label as marketing, which is what it is.
- Price per kilowatt and per panel for genuine comparability.
- Specification gaps made visible before you commit.
- Questions that target the things which actually fail on a roof.
Assumptions And Accuracy Limits
- It does not assess whether any structure is strong enough. That needs a designer and the site.
- A ticked box reflects what the vendor said, not what will be delivered.
- Steel weight is not estimated here; the solar structure estimator does that from a member list.
Common Mistakes To Avoid
- Treating L2 as a specification. Ask for section sizes and thicknesses instead.
- Ignoring the finish. Painted mild steel and hot-dip galvanised are different products with different lives.
- Overlooking the waterproofing. Anchors penetrate the roof, and somebody has to make it watertight again.
L1, L2 And L3 Solar Structure: Which One Suits Your Roof
In Pakistan a solar structure is often described as L1, L2 or L3, which refers to the height of the frame above the roof. L1 is the lowest and uses the least steel, L2 is raised so that the roof beneath is more usable, and L3 is taller again for use under the panels or for clearing obstacles.
Enter the number of panels and the tool compares the three options for steel weight and cost, so you can judge whether the extra height is worth it for you.
Frequently Asked Questions
What is the difference between L1, L2 and L3 solar structures?
They are market labels for roughly how elevated and heavy a structure is, with L1 the lowest and L3 the tallest in most vendors’ usage. There is no standard behind them, so two vendors’ L2 can be different steel. Always ask for the member sizes.
Which structure type should I choose?
That depends on your roof, the shading, whether you need to use the space underneath and the local wind exposure. It is a design decision, and this tool exists to compare what is being offered rather than to make it for you.
Why is one structure quote half the price of another?
Usually lighter sections, a cheaper finish, fewer anchor points, or installation excluded. The specification table is designed to surface which of those it is.
What is an L2 solar structure?
It is a raised structure that holds panels higher than the basic L1 type, often leaving usable space or clearance beneath. Exact heights vary by installer.
Is an L3 solar structure better than L1?
Not necessarily. It is taller, uses more steel and costs more, but it gives space below. Choose according to how you want to use the roof.
Related Free Tools
- Solar Mounting Frame Material & Budget EstimatorBuild a member-by-member frame takeoff with theoretical steel weight and your own rates.
- Rooftop Solar Layout & Obstacle StudioDraw your roof, add the mumty, tank and walkways, and see how many panels genuinely fit.
- Solar Rooftop Survey & Maintenance Checklist BuilderBuild a printable rooftop survey and maintenance log so the installer visit is not wasted.
Get A Measured Quotation
If none of the quotes will state their member sizes in writing, that is worth knowing before you choose. Ramzan Steel Works quotes solar structures with the sections, thickness, finish and anchoring specified.