One of the most useful questions in fixed-tilt solar design is how much regularity we should preserve. Row spacing looks like a single input, but in practice it connects terrain, shading, DC and AC capacity, cabling, field execution, and project economics. With PVGround you can build both a fixed-spacing baseline and an Adapt Spacing layout on the same model, then validate the difference in PVsyst.
Step 1
Why Regular Pitch Still Makes Sense
Regular pitch has a clear logic. You pick a row spacing, keep it consistent, control shading, and make the layout easy to explain, set out, and repeat in the field. For construction teams and EPC coordination, that simplicity matters.
On many sites a single spacing is enough. It gives you a clean baseline, a straightforward bill of quantities, and a layout that field crews can install without constantly checking local exceptions.
Step 2
When the Same Pitch Behaves Differently on Terrain
Terrain rarely behaves like a flat spreadsheet. The same pitch can perform differently across a site depending on slope, orientation, and local surface variation. A spacing that is slightly conservative in one block may become slightly aggressive in another.
That is the core tension: should pitch stay fixed across the layout, or should it adapt to what the terrain is actually doing? The answer is not automatic — but it is worth measuring instead of assuming.
Fixed row spacing layout on sloped terrain
Step 3
PVGround Adapt Spacing as a Design Option
Adapt Spacing is PVGround’s terrain-aware alternative to a single fixed pitch. Instead of forcing one spacing everywhere, the layout can vary row distance block by block while staying aligned with the shading analysis used inside the software.
In practice this often starts from Layout Iteration or adaptive spacing workflows: you define the frame settings and shading targets, compare capacity at different spacings, and let the tool propose a spacing pattern that follows the terrain rather than flattening it on paper.
The fixed-spacing layout remains the baseline. Adapt Spacing is the follow-up question: what changes if the site is allowed to breathe?
PVGround Adapt Spacing layout on the same site
Side-by-side comparison of fixed spacing and Adapt Spacing
Close-up 3D view of row spacing differences
Step 4
How We Compared the Two Layouts
In this comparison we used the same fixed-tilt site, the same frame type, and a similar shading-loss target for both scenarios. The first layout kept a single row spacing across the PV area. The second used PVGround Adapt Spacing.
PVGround supplied layout metrics — installed DC and AC capacity, module count, and shading results from the internal analysis. Both layouts were exported to PVsyst for Year-1 production and specific yield so energy could be compared on the same meteorological and loss assumptions.
Before running either scenario, geo coordinates, terrain, and shading objects had to be in place — the same precondition PVGround uses for Layout Iteration and shading-aligned adaptive spacing.
PVGround metrics summary for both layout scenarios
Step 5
What the Numbers Show — and What They Do Not
Update the values below with your project figures from PVGround and PVsyst. The comparison is structured around two questions: did energy rise because the plant performs better per watt installed, or because more DC capacity fit on the same land while shading stayed in range?
If specific yield barely moves but Year-1 energy and DC capacity rise together, the gain is mostly a land-use and layout-density improvement. If specific yield rises materially, you are looking at a performance-efficiency improvement. Both can be valuable, but they lead to different downstream decisions.
Read specific yield carefully
A small change in Wh/W with a larger change in MWdc usually means the extra energy came from fitting more capacity on site, not from a magically better plant per installed watt.
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Shading loss — fixed spacing
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Shading loss — Adapt Spacing
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DC capacity — fixed spacing
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DC capacity — Adapt Spacing
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Year-1 energy (PVsyst) — fixed
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Year-1 energy (PVsyst) — Adapt
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Specific yield — fixed spacing
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Specific yield — Adapt Spacing
PVsyst production comparison between layout scenarios
Step 6
Constructability and Economics Still Decide
Adapt Spacing is not free complexity. A non-uniform layout can mean less standardized installation, more variation between blocks, more effort in LV cable routing, more layout verification, and less repeatability during construction. Those issues can quietly move cost, schedule, and field risk.
Higher DC capacity can also push AC sizing, transformer blocks, and BOS quantities. Even when simplified LCOE looks similar, the execution path may not be. That is why the useful conclusion is not “Adapt Spacing is always better,” but “Adapt Spacing deserves to be tested,” especially where fixed pitch may be leaving capacity behind.
Trade-offs between layout density and field repeatability
Pitch Is a Project Decision, Not Just a Spacing Input
A regular-pitch layout gives you a clean baseline. Adapt Spacing asks a better follow-up question: what are we giving up by forcing the site to behave regularly?
PVGround lets you answer that inside AutoCAD with metrics you can export to PVsyst. The final choice still depends on constructability — but at least the design question becomes measurable instead of ideological.
Questions to Ask Before You Choose
Use this checklist when you compare fixed spacing against Adapt Spacing on your own site:
- Where does the extra energy come from — higher specific yield or more installed DC?
- What does the extra capacity do to cabling, transformer blocks, and access?
- How much field repeatability are you trading for layout density?
- Does the economics still work once execution complexity is priced in?
In our comparison, Adapt Spacing kept shading in the same band while opening room for more installed capacity — then PVsyst confirmed whether that translated into meaningful Year-1 energy. Your numbers will differ; the workflow is what scales.