CSLB C-46 Solar ContractorPlanning and EstimatingEasy
During the initial site analysis for a residential solar installation, a contractor observes significant shading on the roof from a large, mature oak tree to the southwest. Which of the following is the MOST appropriate initial action to address this observation?
- ARecommend trimming or removing the tree immediately to maximize solar gain.
- BUse a shade analysis tool to quantify the impact of the shading throughout the year.
- CPropose a ground-mount system in an unshaded area of the property.
- DSuggest installing microinverters on all modules to mitigate shade losses.
Show answer & explanationAnswer & explanation
Correct answer: B. Use a shade analysis tool to quantify the impact of the shading throughout the year.
Before making any recommendations or design changes, the contractor must first quantify the extent and impact of the shading. A shade analysis tool provides the necessary data to inform subsequent decisions.
Why the other options are wrong
- A. This is a premature and potentially aggressive recommendation without quantifying the impact.
- C. This is a possible solution, but only after understanding the severity of the roof shading.
- D. While microinverters help with shade, their necessity and effectiveness depend on the degree and pattern of shading, which needs to be analyzed first.
Shade Analysis
The process of evaluating the impact of shading objects on a potential solar array location to determine energy production losses.
- Crucial for accurate system sizing and performance predictions.
- Involves identifying shade sources and their annual path.
- Utilizes tools like Solmetric SunEye or drone mapping.
Memory trick: Shade is a problem, but measure it first to avoid a solar squabble!