# Send solar ROI proposals from electricity bills with WhatsApp, OpenAI and Google Drive

> Quick overview This workflow captures rooftop solar leads from WhatsApp or an n8n web form, uses OpenAI to OCR electricity bills, calculates system sizing, PM Surya Ghar subsidy, and ROI, renders a branded PDF via Gotenberg, and delivers the proposal on WhatsApp while tracking everything in Google Sheets and Drive. How it works 1. Triggers when a lead messages you on WhatsApp or submits the n8n form with an uploaded electricity bill image. 2. For WhatsApp leads, checks whether an image is included and either downloads the bill media or replies asking the lead to send a clear bill photo. 3. Sends the bill image to OpenAI (GPT-4o) to extract consumption, tariff, sanctioned load, and history, then validates the result and requests a clearer photo if the bill is unreadable. 4. Calculates the recommended system size, expected generation, PM Surya Ghar subsidy, net cost, payback, EMI estimate, and 25-year savings, and assigns a HOT/WARM/NURTURE lead score. 5. Uses OpenAI (gpt-4o-mini) to gen

- **Domain**: `n8n-workflow-20875.n8n.io`
- **Provider**: n8n.io (https://n8n.io)
- **Kind**: workflow
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 40%

## URLs
- Agent card: https://n8n.io/workflows/20875
- Page (HTML): https://agenstry.com/agents/n8n-workflow-20875.n8n.io
- Documentation: https://n8n.io/workflows/20875