Solar panel savings calculator
See monthly and annual savings from solar and a simple payback period.
Estimate for information only — not financial, tax, legal or medical advice.
How it's calculated
kW = (monthly kWh ÷ 30) ÷ (peak sun hours × (1 − losses)). Panels = ceil(kW × 1000 ÷ panel W). Savings = units offset × tariff.
- Peak sun hours vary by city and season (Pakistan typically ~4.5–6)
- Net-metering buyback rates are not modelled
- Assumes full self-consumption
Version 1.0 · exact decimal maths · inputs are not stored.
Questions
What tariff should I enter?
Your average cost per unit: divide the bill total by the units consumed. Using the top slab rate overstates savings if solar would only offset your cheaper units.
Is simple payback the full picture?
No. It ignores panel degradation, battery or inverter replacements, maintenance and tariff changes. It is a quick comparison figure, not a financial forecast.