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Solar Savings & ROI Calculator (2026) – System Payback Tool
Expert Guide
Estimate real-world solar ROI based on system generation and local electricity tariffs.
⚡ Quick Answer
A 3kWp solar system generates ~360–400 units monthly. At NRS 10/unit, you save ~NRS 4,000/month. Payback is usually 5-6 years. For large solar designs, visit pro.nirmansutra.com.
🛠️ How It Works
- •Enter your planned solar array capacity in kWp.
- •Input your current average monthly electricity tariff and consumption.
- •The tool applies solar generation averages (4.5 units per kW per day).
- •The ROI result indicates how many years until the system pays for itself through bill reduction.
📐 Calculation Formula
Units/Month = kWp × 4.5 Peak Hours × 30 Days
Payback = Total Cost / (Monthly Savings × 12)
⚠️ Common Mistakes to Avoid
- ✕Forgetting battery replacement — for off-grid systems, batteries must be replaced every 3-5 years, which adds to the long-term cost.
- ✕Ignoring shading — a single shadow on one corner can reduce panel efficiency by 50% through the bypass diodes.
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❓ Frequently Asked Questions
A standard 1kW solar PV system generates approximately 120–140 units of electricity per month, depending on cloud cover and panel orientation.
With current electricity tariffs, the typical payback period for a grid-tie solar system is 5 to 7 years. Solar panels last 25+ years, making it a highly profitable investment.
Yes, Nepal Electricity Authority (NEA) provides net-metering facilities for grid-connected solar systems, allowing you to sell excess power back to the grid.
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Worth NRs. 5,000
NRs. 999 🎯
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