Independent Solar Engineering Engine • Zero Contractor Bias

LESCO Solar Calculator & Lahore Net-Billing Payback Guide

Customized for Lahore Electric Supply Company (LESCO) consumers, accounting for summer peak heat and winter smog solar derating.

5.4 Peak Sun Hours / Day Coastal haze • High year-round sun 0.78 summer derating (temp & dust) factored

Electricity Usage

Enter bill, drag slider, or tap a quick preset

STEP 1

Monthly Bill Amount:

Rs.

Quick Presets:

Estimated Grid Units: ~780 units

Don't have your bill handy?

Household Appliance Load:

1.5-Ton Inverter AC

750W continuous @ 26°C Econ

Daily Running Hours:

1.0-Ton Inverter AC

550W continuous @ 26°C Econ

Daily Running Hours:

Ceiling Fans

55W (14 hrs/day)

Inverter Refrigerator

150W continuous

Deep Freezer

180W continuous

1.0 HP Water Pump

1100W (1 hr/day)

LED Lights & TV / Wi-Fi

150W (6 hrs/day)

Calculated Total: ~780 Units

Estimated Grid Bill: ~Rs. 48,000

Top Energy User: 1.5-Ton Inverter AC (58% of bill)

Rooftop Structure Type

Grid Meter Phase

Night AC Battery Storage

Run inverter AC during night loadshedding

Inverter ACs Running at Night 1 AC

Night Backup Required 8 Hours

Battery Chemistry

2026 Solar Impact Audit

-87% Bill Drop

Current Utility Bill

Rs. 48,000

Progressive tariff slabs

New Post-Solar Bill

Rs. 6,200

Residual grid charges

Monthly Net Cash Kept In Pocket: +Rs. 41,800 / month

Recommended System Architecture

Calibrated for Tier-1 580W N-Type Bifacial TOPCon Modules

ENGINEERING SPEC

Solar Array Capacity

6.4 kW

Rated DC capacity

580W Panel Count

11 Panels

580W Bifacial TOPCon

Inverter Sizing

6 kW Hybrid

48V Pure Sine Wave

Required Roof Space

308 sq ft (~1.4 Marla)

Clear unshaded south/south-west exposure

Structure Rating

12-Gauge Galvanized

130 km/h wind certified

Night AC Battery Bank: 2x 5.12 kWh LiFePO4 (51.2V 100Ah)

Optimal for continuous AC loads. 4,000+ deep cycle lifespan (approx. 10 years).

Financial Returns & Net-Billing Payback

2026 NEPRA MODEL

Estimated Turnkey Capex

Rs. 9.5L – 10.7L

Tier-1 Hardware & Labor

Monthly Savings

Rs. 46,947 / mo

Slab avoidance

Payback Period

~1.8 Years

55% annual ROI

5-Year Net Profit

Rs. 18.0 Lakhs

Cumulative net savings

2026 Net-Billing Energy & Tariff Balance

Solar Self-Consumption

~35% Solar Offset

Displaces top progressive retail slabs

Grid Export Credit (NAEPP)

~533 units (Rs. 11,460)

Wholesale credit @ Rs. 21.50/kWh

Net Post-Solar Bill

Rs. 15,977 / mo

Residual bill to local utility

2026 Net-Billing Calibrated: Direct daytime consumption immediately displaces top progressive slabs (~Rs. 45-60/kWh). Exported daytime solar is credited at the wholesale NAEPP rate (~Rs. 21.50/kWh), protecting payback horizons.

Budget Alternative: Daytime "Slab-Breaker" Setup 55% Lower Capex

If hybrid storage exceeds your upfront budget, install a smaller daytime system without night batteries:

Array Sizing

3.5 kW (6 panels)

Estimated Capex

Rs. 4.1L – 4.6L

Monthly Savings

Rs. 29,170 / mo

*Skips expensive batteries. Runs your household and ACs on solar during the day, dropping your grid consumption below 200 units to qualify for base tariff slabs.

Contractor Quotation Validator

Have a quote from a local installer? Verify if you're being overcharged.

BS DETECTOR

Quoted Size (kW)

Quoted Price (PKR)

System Scope

LESCO Solar Engineering & Smog Resilience in Lahore

Lahore features intense solar irradiance during summer (5.0 PSH), which perfectly matches peak air conditioning demand. Sizing a system under LESCO requires careful attention to rooftop pergola elevation to clear terrace parapets and smog dust cleaning protocols.

Explore Neighboring Punjab Utility Calculators

GEPCO (Gujranwala / Sialkot) FESCO (Faisalabad) MEPCO (South Punjab) IESCO (Islamabad / RWP)

Explore Solar Sizing Guides & Cost Breakdowns (Pakistan 2026)

Detailed engineering specs, monthly unit yields, 580W panel counts, and turnkey cost breakdowns by system capacity:

3kW Solar System →

5–6 Marla homes running fans, lights, fridge, & 1 inverter AC. ~350–420 units/mo.

5kW Solar System →

10 Marla homes running 2 Inverter ACs + household load. ~600–750 units/mo.

10kW Solar System →

1 Kanal residences with 3–4 ACs & net-metering. ~1,250–1,500 units/mo.

15kW – 20kW Systems →

Commercial plazas, schools, clinics, & large joint families. ~2,000–3,000+ units/mo.

Solar Panels for AC Guide Lithium LiFePO4 Battery Guide Contractor Quotation Validator Free Embeddable Calculator Widget

Frequently Asked Questions (Solar Sizing & NEPRA Tariffs)

How does winter smog in Lahore affect solar generation?

Winter smog in Lahore can reduce solar generation by up to 45% between November and January. Our calculator factors in a 0.78 derating factor and recommends proper tilt angle (28°-30°) for winter clearance.

What are the steps for LESCO net-metering approval?

The process involves submitting an AEDB-certified engineer dossier, obtaining a DISCO NOC, paying the bidirectional meter demand notice, and completing the electrical inspection.

Is solar profitable in Lahore under LESCO net-billing?

Yes. Because residential tariffs in LESCO reach up to Rs. 48/unit in peak summer slabs, self-consuming solar energy saves substantial money, delivering a payback of 2.0 to 2.4 years.