Usually yes, if the system is sized around your own daytime use instead of aggressive exports. This calculator stays conservative on export income and treats self-consumption as the base case.
Karachi Solar Company
Karachi Solar Savings Calculator
Start with the KE bill. Add units if you have them. The output stays conservative and Karachi-specific.
Estimate setup
Enter the bill. Add units if you know them.
Quick-start presets are only benchmarks.
A common family-home range where rooftop solar becomes a serious planning decision.
Required
Current input: Rs 50,000
Optional
Using an estimated 805 units per month from the bill.
Connection
Account type
Goal
Planning priority
Directional estimate from bill only805 units estimated
Current estimate
4.5 kW - 6.5 kW
On-grid system
On-grid-first system sized around daytime self-consumption. Based on Rs 50,000 monthly and roughly 805 units per month.
Monthly savings
Rs 23K - Rs 34K
Usually lands around 46% - 68% of the current bill.
Installed cost
Rs 560K - Rs 1M
Typical generation range: 565 kWh - 945 kWh per month.
Payback
1.4 years - 3.8 years
Financial range only. Final pricing depends on roof, hardware, and site conditions.
Roof allowance
320 sq ft - 590 sq ft
Allow extra room for walkways, parapets, shade setbacks, and practical access.
What this range assumes
Monthly units are estimated from the bill only. Add your KE units for a tighter result.
The savings range prioritizes daytime self-consumption rather than assuming every exported unit pays back well.
Export upside and future net-metering benefits are treated as optional upside, not the base case.
No. A standard on-grid system shuts down when the grid is down, so it does not act like backup during load shedding. If daytime backup matters, you need a hybrid or battery-backed setup.
Choose on-grid when the main goal is bill reduction. Choose hybrid when outage coverage matters more than payback, because batteries and hybrid hardware increase the upfront cost.
Qualified cases move in stages. K-Electric’s current guideline says qualification within 5 working days, agreement and estimate within 17 days for qualified cases, and meter installation within 30 days after payment, though incomplete documents and transformer constraints can extend timing.
You can still use the calculator. It estimates units from the bill so you get a working system-size and savings range, and the output gets tighter when you add the actual monthly units.
Yes. Three-phase and time-of-use accounts can behave differently from a standard residential bill, so the calculator trims the assumptions to stay conservative.
A practical planning range is around 70 to 90 square feet per kW before detailed design. Parapets, shading, walkways, and roof shape can increase the real requirement.
Usually not. Batteries help with backup and outage comfort, but they often lengthen payback if your only goal is lowering the KE bill.
Proposal Brief
Tell us about the site.
The calculator result is a starting point, not the finished design.