Solar ROI Calculator

Estimate savings before you ask for quotes

Configure your system on the left. Your commercial outcome updates instantly on the right.

1

Solar connection type

Determines how exported solar energy is valued under NEPRA policy.

You will get a net billing connection. Savings come mainly from self-consumption because exported units earn only around Rs 8/kWh.
2

Project location

Peak sun hours vary by city and directly affect daily generation.

Higher peak sun hours mean stronger daily output for the same installed size.

3

System size

Installed capacity in kilowatts. Larger systems generate more but increase project cost.

Most residential systems are 5–15 kW. Large systems may need a site review.

4

Daytime occupancy

Solar is most valuable when your loads run while the sun is out.

5

Electricity consumption

Use your bill for a quick estimate, or enter daytime demand directly.

Tip: divide your total bill amount by monthly units to get your blended tariff.

Live estimate

Updates instantly as you change inputs. Use this as a first-pass commercial summary.

Estimated yearly saving

PKR 136,875

Lahore · 5 kW · 36.1% self-use

PKR 11,250

Monthly savings

45.5 yrs

Simple payback

Energy flow

Daily generation (5 kW × 5.2 hrs × 80%)20.8 kWh
Used directly on-site7.5 kWh
Exported to grid13.3 kWh
Net billing export ratePKR 8.13/unit

PKR 375

Self-use saving/day

Not counted

Export (new install)

PKR 550,000750,000

Est. installed cost

PKR 136,875

Yearly savings

Sizing check

Modeled daytime load7.5 kWh/day
Min size to cover daytime2 kW
Fit signalLooks commercially reasonable

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Savings are estimated from unit consumption only. Fixed charges, fuel adjustments, taxes, shading losses, roof orientation, and seasonal swings are not included. Use this as a first-pass screening tool, not a bankable ROI model.

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