How big a solar system do I need for a 500-unit monthly bill in Pakistan?

Rough rule: divide monthly units by 130 to get kW needed in central Pakistan (Lahore / Faisalabad / Multan sun belt). 500 units / 130 ≈ 3.8 kW, round up to 4-5 kW for headroom. Add 1 kW per 1.5-ton AC if you run AC heavily May-September. Our calculator does this city-by-city (Karachi 5.5 sun hours = smaller system needed; Islamabad 5.0 = slightly larger). Always size up 15-25% for future load growth and panel degradation (panels lose ~0.5% output per year).

What is the price of a 5kW solar system in Pakistan in 2026?

Approximate market prices Q2 2026: on-grid 5kW (no battery, with net metering) Rs 7-9 lakh installed including 580W panels (~9 panels), 5kW hybrid inverter, mounting, wiring, labour. Hybrid 5kW with 5-10 kWh lithium battery Rs 11-15 lakh. Prices vary ±20% by panel brand (Longi / Jinko / Canadian tier-1 vs cheaper Chinese tier-2), inverter brand (Inverex / Solis / Knox / MaxPower), location (Lahore competitive, Quetta + smaller cities ~10-15% pricier). Always get 3 written quotes with brand and warranty terms explicit.

How many 580W solar panels do I need for 5kW?

5000W ÷ 580W = 8.6, so 9 panels at standard 580W (most common residential panel sold in Pakistan in 2025-26). If your roof is tight, 600W or 605W bifacial panels reduce count to 8-9 with the same output. If only 540W or 555W panels are available locally, you need 10 panels for 5kW. The tool defaults to 580W mono-perc; ask your vendor what wattage they propose.

Which city gets the best solar output in Pakistan?

Annual average peak-sun-hours: Quetta 5.7, Sukkur 5.6, Bahawalpur 5.6, Karachi 5.5, Hyderabad 5.5, Multan 5.4, Sargodha 5.4, Lahore 5.3, Faisalabad 5.3, Gujranwala 5.3, Peshawar 5.2, Sialkot 5.2, Mardan 5.2, Islamabad 5.0, Rawalpindi 5.0, Abbottabad 4.9. Sunnier cities need slightly smaller systems for the same monthly units. Monsoon (Jul-Sept) hits Punjab and KPK harder than Sindh and Balochistan, the calculator factors this in.

How much rooftop area is needed for a 5kW solar system?

Roughly 400 sqft (80 sqft per kW × 5). A standard 580W panel is ~24 sqft (2m × 1.1m). 9 panels packed tight take ~220 sqft, but spacing for tilt, walkways and shade-free placement pushes the real requirement to ~400 sqft. A 5 Marla house (1,125 sqft plot, ~600-800 sqft of usable roof after stairwells / water tanks) accommodates a 5kW system comfortably; a 3 Marla or shared rooftop may need ground mount or carport extension.

What is the simple payback period for solar in Pakistan in 2026?

On a Rs 18,000-30,000 monthly bill, on-grid 5-7 kW system: 5-7 years post-March 2025 NEPRA buyback policy change (was 3-4 years pre-2025). Hybrid systems with battery: 7-10 years (battery cost takes longer to recover). After payback, the system runs almost free for the remaining 15-18 years of its 25-year warrantied life, you keep 100% of the savings.

On-grid vs hybrid, which should I pick?

On-grid (net metering, no battery): cheapest, best ROI, but blacks out when grid blacks out (anti-islanding requirement, your solar shuts off during load-shedding for grid worker safety). Hybrid (with battery): keeps running during load-shedding, BUT adds Rs 3-7 lakh for a usable battery bank, stretches payback by 2-4 years, and batteries need replacement every 10-15 years. Pick hybrid only if you face frequent load-shedding (Karachi industrial areas, parts of Balochistan) or you specifically need uninterrupted power for medical / business reasons.

What are the best solar panel brands available in Pakistan 2026?

Tier-1 (premium, 25-year linear warranty, ~Rs 40-48/W): Longi, Jinko, Canadian Solar, JA Solar, Trina. Tier-2 (budget, shorter or weaker warranty, ~Rs 28-38/W): various Chinese brands. For a long-term home installation, pay the tier-1 premium, Rs 30-50k extra spread over a 25-year life is trivial vs the risk of cheap panels degrading 2-3% per year (versus 0.5%) and needing replacement at year 12-15.

Solar System Size Calculator Pakistan

Enter your monthly bill or units + city + AC count and get the right kW size, panel count, rooftop area, system cost and simple payback for Pakistani homes.

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About the Solar System Size Calculator Pakistan

Free Pakistani solar system sizing calculator built for real homes, not generic global formulas. Enter your monthly units (kWh) or bill amount (PKR), pick your city from 16 supported Pakistani locations (each with its own peak-sun-hour and monsoon de-rate factor), set the number of 1.5-ton ACs and a future-growth buffer, choose on-grid (net metering) vs hybrid (with battery), and the tool returns recommended system size in kW (rounded to nearest 0.5kW), exact 580W panel count, rooftop area required in sqft, approximate installed cost in PKR (panels + inverter + mounting + wiring + installation), expected monthly production in kWh, estimated monthly savings after net metering, and simple payback period. Designed for a Pakistani household weighing a Rs 5-15 lakh solar investment, show your spouse the numbers before signing a vendor quote.

Monthly units (kWh)

Check the units consumed line on your last electricity bill.

City

System type

AC units (1.5 ton equivalent)

Future-growth buffer (%)

Recommended size

5.5 kW

580W panels needed

10 panels

Rooftop area

~440 sqft

Approx. system cost

Rs 825,000

Monthly production

~672 kWh

Est. monthly savings

Rs 20,293

Simple payback

3.4 years

How this is calculated: kW needed = (daily kWh × 1.2) ÷ (Lahore's 5.3 peak sun hours × 82% system efficiency × 94% monsoon-adjusted annual factor). Cost uses Rs 150,000 per kW (typical on-grid price Q2 2026, panels + inverter + installation).

Real quotes vary ±20% by brand (Longi / Jinko / Canadian panels; Inverex / Solis / Knox inverters) and region. Get at least 3 quotes; verify panel warranties (25-year linear), inverter warranty (5-10 years), and net metering installation included.

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How to use the Solar System Size Calculator Pakistan

Choose how you want to enter your usage: by monthly units (kWh from your bill) or by monthly bill amount (PKR), the tool reverse-engineers units via the current NEPRA slab table.
Pick your city from the 16 supported Pakistani locations; each has a calibrated peak-sun-hour figure (Quetta 5.7h is the sunniest, Abbottabad 4.9h the lowest) and a monsoon de-rate so the recommendation works year-round.
Pick on-grid (cheaper, uses net metering, no battery) or hybrid (with battery for load-shedding backup, ~30% more expensive).
Set the number of 1.5-ton AC units in your home and a future-growth buffer (20% is a sensible default for a 5-10 year horizon, accounts for adding another AC, EV charging, kid moving back home).
Read off: recommended kW size, exact 580W panel count, rooftop area required (sqft), approximate installed system cost, expected monthly production, monthly savings, simple payback in years, then take that number into any vendor negotiation.

Frequently Asked Questions

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Solar System Size Calculator Pakistan

About the Solar System Size Calculator Pakistan

How to use the Solar System Size Calculator Pakistan

Frequently Asked Questions

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