How to Create a GST Invoice for Solar Sales & Installation
Whether you're a solar EPC company, a rooftop installer, or a panel distributor, every sale in India needs a proper GST tax invoice — with your GSTIN, the buyer's details, HSN/SAC codes, and the correct tax split (CGST/SGST for intra-state, IGST for inter-state).
What to include in a solar invoice
- Seller details: business name, address, GSTIN, state
- Buyer details: name, address, GSTIN (if registered), state
- Invoice number & date — sequential and unique per financial year
- Line items with description, HSN/SAC code, quantity, rate, and GST%
- Tax breakup: CGST+SGST or IGST depending on place of supply
- Grand total in INR
Common HSN/SAC codes for solar businesses
- 8541 — Solar PV panels/modules (12% GST)
- 8504 — Solar inverters and charge controllers
- 9954 / 9983 — EPC/installation/works contract services
- 8507 — Batteries (varies by chemistry, typically 18-28%)
Why CGST/SGST vs IGST matters
If you and your customer are in the same state, GST is split equally into CGST (Central GST) and SGST (State GST) — for example, 6% + 6% for a 12% rate. If the customer is in a different state, the full rate is charged as IGST (e.g. 12%). Getting this wrong can cause input tax credit mismatches for your customer, so this generator auto-detects the split based on the states you enter.
Why use a free generator instead of manual Excel sheets?
A consistent invoice format builds trust with customers, reduces calculation errors in GST amounts, and saves time compared to manually building tables in Word or Excel for every job. Use this tool to quickly draft an invoice, then print or save it as a PDF to email or WhatsApp to your customer.