HeyJo v1

Photovoltaic installers work on rooftops, in the field, often alone. When they hit a technical question — a wiring diagram, an error code, a configuration parameter — they need the answer right there, not back at the office. But digging through PDF manuals on a phone is painful.

HeyJo v1 was built to solve that. We chose Telegram because installers already had it on their phones — no app to install, no account to create. Just open a chat, ask your question, get the answer from the right user manual.

We built a library of technical documentation covering the solar vertical — inverters, panels, batteries, monitoring systems. The bot used AI to search through these documents and return precise, source-cited answers with page references and diagrams pulled straight from the manuals.

The technology worked well. Installers could ask natural language questions and get accurate answers in seconds instead of scrolling through hundreds of pages.

In practice, we struggled to reach installers directly — our conversations kept happening with support centres inside companies instead. And we ran into a harder problem: no matter how many manuals we gathered, the library was never complete enough. There was always a product we didn't cover, a document we didn't have.

The core insight: AI-powered document search was genuinely useful, but trying to maintain a universal library ourselves wasn't scalable. The real value would come from letting companies bring their own documents and build their own knowledge bases. That led directly to HeyJo v2.