Ladybug Pv < Top | CHECKLIST >

Let’s dismantle the black box. How does Ladybug PV actually work, what assumptions is it making, and how do we move from kWh/m² to actual return on investment? First, a critical clarification for the purists: Ladybug PV does not perform its own cell-level semiconductor simulation. That would be computationally ruinous for an urban-scale model. Instead, Ladybug leverages the NREL PVWatts v8 API (or the local DC power model if you disable API calls).

In the world of environmental design, we often talk about solar radiation in terms of avoidance . We use shading devices to reject heat, glazing coatings to manage transmittance, and massing studies to reduce cooling loads. ladybug pv

But what about harvesting ?

Ladybug PV calculates the AC power as: If DC Power > Inverter Capacity, then AC Power = Inverter Capacity (Clamped) Let’s dismantle the black box

A flat roof in winter might never clip. A tilted roof in June will clip for 4 hours a day. Ladybug PV calculates the clipping loss hourly. If your simulation shows flat-topped power curves at noon, your inverter is too small. If it never clips, your inverter is too big (expensive). 4. Ground Reflection (Albedo) The default albedo is 0.2 (green grass/dirt). But what happens when you put a bifacial panel on a white TPO membrane roof? Albedo jumps to 0.7. That would be computationally ruinous for an urban-scale

While most Ladybug Tools (LBT) users are comfortable running radiation studies for architecture, few have fully unlocked the nuance of . This native component isn't just a "solar panel calculator." It is a bridge between microclimate physics and electrical engineering.

Garbage tilt = garbage power. Bad shading mask = bad ROI.