Solar Row Spacing Chart

Use this worksheet after the calculator result to record row pitch, shadow length, solar altitude basis, ground projection, GCR, and project follow-up.

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Quick reference table

A solar row spacing chart is a calculator-led planning worksheet. It records the geometry behind a PV row pitch estimate before shade modeling, racking layout, structural review, utility/AHJ review, and installer design.

Solar row spacing worksheet

Solar row spacing worksheet
Item	Record from calculator	Follow-up
Solar-altitude basis	Winter-solstice or custom altitude	Confirm project shade criterion
Row geometry	Tilt, row length, vertical height, ground projection	Check racking and module orientation
Spacing result	Shadow length, minimum pitch, entered pitch	Review site layout and access aisles
Density result	Ground coverage ratio	Compare with production and land-use goals

PV layout documentation

PV layout documentation
Review item	Record on worksheet	Why it controls the next step
Site conditions	Roof, ground, slope, parapet, obstruction note	Real shade can differ from a level-plane estimate
Row assumption	Tilt, row length, azimuth, lower-edge height	Racking geometry controls final spacing
Review path	Shade model, structural note, utility/AHJ, installer	The planning estimate must become a project layout
Access and maintenance	Aisles, setbacks, equipment paths	PV row density cannot override service access

Formula basis

Minimum row pitch = row ground projection + shadow length.

Ground projection is the horizontal projection of the tilted module row.
Shadow length is vertical row height divided by tangent of the selected solar altitude.
Solar altitude can come from the winter-solstice latitude calculation or a project-specific shade model.
GCR is ground projection divided by entered or screened row pitch.

Worked examples

Winter-solstice row-pitch recordRecord latitude, solar altitude, tilt, row length, ground projection, shadow length, minimum row pitch, entered row pitch, GCR, and reviewer notes.

Custom shade-model documentationDocument the project-specific solar altitude, row geometry, resulting pitch, site obstruction notes, and shade-model owner before layout approval.

Assumptions. Balanced load and line-to-line voltage assumptions behind this chart.

The worksheet assumes adjacent rows share the same lower-edge height on a level planning plane.
Final row spacing depends on terrain, obstructions, azimuth, time-window criteria, racking geometry, access, product data, and installer design confirmation.

Code and standard notes. Planning limits that should be checked before final equipment selection.

Use this chart as a row-spacing reference; verify site survey, shade model, racking geometry, structural constraints, manufacturer data, utility/AHJ expectations, and installer design before procurement or construction.

How to use this chart

1Record the solar angleWrite whether the result uses winter-solstice noon or a custom project solar altitude.

2Record row geometryCarry tilt, row length, vertical height, ground projection, and lower-edge height into the layout review.

3Prepare review itemsList shade-model, racking, structural, utility/AHJ, access, and installer follow-up before layout approval.

Worksheet checklist. Record source basis, review gaps, and assumptions before using the chart result.

Capture inputsRecord latitude or custom solar altitude, tilt, row length, lower-edge height, and planned pitch.
Capture outputsWrite solar altitude, vertical height, ground projection, shadow length, minimum pitch, status, and GCR.
Capture review itemsList site survey, shade-model, racking, structural, access, utility/AHJ, and installer actions.

Common mistakes to avoid. Review these before turning chart current into an equipment decision.

Using one generic spacing value without recording the solar-altitude basis.
Treating level-plane row pitch as final layout on sloped or obstructed sites.
Increasing GCR without checking shade losses, access aisles, racking constraints, and installer design confirmation.

Frequently asked questions

These answers explain how to use the chart without turning a quick reference into a final design decision.

Why does the worksheet keep the solar-altitude basis visible?

Because winter-solstice noon, a time-window criterion, and a project shade model can use different angles and produce different row pitch decisions.

Can GCR alone decide the layout?

No. GCR helps compare density, but production, shading, access, setbacks, racking limits, structural review, and project economics still control the final layout.