Visualize roofs in 3D, Automate panel placement and circuit design. Renewing solar estimation from “hours to minutes.”

Nichiei Housing Co. — Auto-generates in 3D the solar panel placement and circuit division once done manually by experts. Starting from property data received from the external base system, it covers everything from layout to estimate end to end, renewing the siloed legacy (C++) engine into a modern architecture.

-70%

Shorter estimation lead time

Hours → minutes (auto-placement + auto circuit division)

100%

Auto circuit division

Supports all product series · zero manual design

113

Automated test count

Logic port quality-assured with 0 lint warnings

Challenge

Before

Experts designed circuits by hand for each roof shape, making the work person-dependent and time-consuming. The legacy (C++) estimation engine was hard to maintain, and design rules grew more complex with every product series added.

Want to automate and shorten manual circuit design

Tens of minutes to hours of design effort per case
Want to instantly check the optimal layout for each roof shape

Hard to optimize generation with 2D drawings
Want to renew the siloed legacy into a modern architecture

C++ engine maintenance was person-dependent
Want logic to automatically cover the ever-growing design rules

Complexity grows with each power conditioner / series

Solution

After

Visualizes roofs in 3D and auto-generates panel placement and circuit auto-division (island grouping / power conditioner selection). Base-system integration makes everything from property data to estimate seamless. The legacy C++ logic was re-implemented in fully tested TypeScript, eliminating person-dependency.

solagrid.example.jp

3D roof layout with circuit auto-division display

Tech stack React / Three.js Spring Boot TypeScript polygon-clipping Vite / Vitest

3DVisualize

RenewalRenewal

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