How Should Shading Evidence Be Prepared for a Rooftop PV Proposal

Describe where shade comes from and when it occurs. A single unshaded photograph cannot represent seasonal or daily conditions. For a supplier discussion, connect roof zones, obstruction positions and time-stamped observations; ask the designer to state how the evidence enters the layout and energy estimate.

Concept illustration for how should shading evidence be prepared for a rooftop pv proposal.

Concept illustration • X-SOLAR • 屋顶光伏方案需要怎样的遮挡资料

Practical review checklist

· Identify sources. Record nearby buildings, trees, parapets and rooftop equipment that can cast shade on proposed zones.

· Keep context. Include observation dates, approximate time, orientation and survey method instead of sending cropped shadow images alone.

· Separate evidence from assumptions. Mark future tree growth or planned construction as scenarios rather than existing measured conditions.

· Review the response. Ask which roof zones or electrical groups are affected and what uncertainty remains in the proposal.

When to request clarification

Keep the estimate conditional if the shade model does not identify its inputs or proposed electrical arrangement. Avoid applying an unexplained universal loss percentage.

Questions buyers ask

Can a flexible module ignore shading? No product format removes the need to assess site shading and system design.

What should be recorded when information is missing? Record the missing evidence, responsible reviewer and condition that must be resolved before the affected decision.

Information to send with an enquiry

Send the roof and obstacle plan, observation notes, model revision if available and the design decision being compared.

This is a project discussion checklist, not an installation instruction or an approval. The selected manufacturers, project engineer and local authority must confirm the applicable requirements.

Related X-SOLAR guide: Roof engineering assessment checklist

Further reading: Australian Government Solar Consumer Guide — design considerations

屋顶光伏方案需要怎样的遮挡资料

遮挡资料应说明来源、位置和出现时间。一张无阴影照片不能代表全天或全年条件，应将屋顶分区、障碍物位置与带时间的观察记录关联，并让设计者说明如何用于布局和估算。

实用核对清单

· 识别来源：记录周边建筑、树木、女儿墙和屋面设备。

· 保留背景：注明日期、时间、方向和调查方法，不仅提供裁剪后的阴影照片。

· 区分证据与假设：树木增长和规划建筑按情景列出，不写成已测现状。

· 审阅回应：确认受影响分区、电气分组及尚存不确定性。

需要澄清的情况

模型未说明输入或电气布局时保留估算条件，不套用无来源的统一损失比例。

常见问题