I’ve enabled a small launch discount on my Rooftop Solar Design Calculator (Excel Workbook). If you were waiting to try it, you can use this coupon:
✅ Coupon code: SOLAR26
This workbook is meant to make early solar planning easier and more realistic, especially if you want to answer questions like:
What system size (kW) fits my annual usage?
How much energy can I expect in year 1 (kWh/year)?
What savings and payback look realistic for my tariff and location?
📘 If you prefer to understand the method first, I’ve also shared a step-by-step guide on my blog (works as the user manual): Solar PV System Design Calculator (Excel)
🛒 You can apply the coupon on the product checkout page here: Rooftop Solar Design Calculator (Excel Workbook)
Small note: this coupon is intended as an early-user offer. If you use it and have feedback, I’d genuinely love to hear what should be improved (more module/inverter options, clearer presets, extra checks, etc.).