Mono vs poly solar panels in Pakistan

The short version

Polycrystalline panels are no longer a serious option in Pakistan. Walk down the solar market on Hall Road or through the dealers off Ferozepur Road and you will struggle to find new poly stock in any meaningful quantity. What you will find is old inventory, refurbished modules, and the occasional container of low-grade imports aimed at buyers who searched for the cheapest rate per watt.

Monocrystalline won because the cost gap closed. In 2018 poly was genuinely cheaper per watt and it made sense on a big flat roof. By 2023 the difference had shrunk to a few rupees. By 2026 mono is cheaper per watt in most sizes because the entire global supply chain converted to it, leaving poly as a low-volume specialty product with worse economics.

What the two words actually mean

Both panel types are silicon. The difference is how the silicon ingot was grown before it was sliced into wafers.

Monocrystalline cells come from a single continuous crystal pulled slowly out of molten silicon. The result is uniform, so electrons move through it with less resistance. Under the glass a mono panel looks black, with cells that have chamfered corners.

Polycrystalline cells come from molten silicon poured into a mould and allowed to cool into many small crystals. It is faster and cheaper to make, but the boundaries between those crystal grains scatter electrons and cost you efficiency. Poly panels look blue and have a visible flecked pattern.

Efficiency and the roof area math

This is the part that actually matters in Lahore, where roof space is limited by water tanks, stair blocks, parapets and the neighbour's boundary wall.

Metric	Typical poly (2019 stock)	Typical mono PERC	Mono N-type 2026
Cell efficiency	15 to 17 percent	20 to 21 percent	22 to 23.5 percent
Panel wattage	330W to 340W	545W to 585W	585W to 645W
Panel size	1.95 sq m	2.58 sq m	2.58 to 2.68 sq m
Watts per square metre	About 172	About 226	About 235 to 240
Panels needed for 5.5 kW	17	10	9
Roof area needed for 5.5 kW	About 33 sq m	About 26 sq m	About 24 sq m

On a typical 10 marla Lahore rooftop you have maybe 45 to 55 square metres of genuinely usable, unshaded area once you subtract the tank, the stair cabin and the setback from the parapet on the shaded side. A 33 square metre poly array eats almost all of it. A 24 square metre N-type array leaves you room to add 2 kW later when your daughter's family moves into the upper portion.

Structure and labour scale with panel count, not watts

Seventeen panels instead of nine means nearly double the rails, double the clamps, more DC cable runs and more roof penetrations. Mounting at PKR 7,000 per kW is quoted per kilowatt, but on a poly build with lower watts per module the structure cost per kW rises in practice because you are supporting more frames for the same output. Add the extra labour and the poly build ends up costing more to install for identical generation.

Price reality in Lahore right now

Current rates for new Tier-1 stock:

• Tier-1 mono 585W: PKR 19,500 per panel, which is about PKR 33 per watt
• 645W bifacial: PKR 21,000 per panel, about PKR 33 per watt
• Astronergy 585W N-type: PKR 25,450 per panel, about PKR 43 per watt

Poly, where you can find it at all, sells as used or B-grade stock at PKR 28 to PKR 35 per watt for panels that are five to eight years old and already three to five percent degraded. That is not a bargain. You are paying near-new prices for a panel with a shorter remaining life, no valid manufacturer warranty in Pakistan, and worse behaviour in heat. Current rates across brands are tracked on our panel price page, with brand-specific pages for Longi, Jinko and Canadian Solar.

Heat behaviour in a Lahore summer

Panel ratings are measured at 25 degrees cell temperature. On a Lahore rooftop in mid June, with ambient at 44 degrees and no wind, cell temperature reaches 65 to 72 degrees. Every panel loses output as it heats, and the rate of loss is the temperature coefficient.

Older poly modules typically sit at minus 0.40 to minus 0.45 percent per degree. Modern mono PERC is around minus 0.35 percent. N-type TOPCon is around minus 0.29 to minus 0.30 percent. At a 45 degree rise above test conditions that difference works out to roughly 6 to 7 percent more output from N-type than from poly, precisely during the hours when your ACs are running hardest. The N-type versus P-type article goes into that in detail, and summer AC load on solar covers what it means for sizing.

Low light and cloudy days, the poly myth

An old claim in the market says poly performs better in cloudy or diffuse light. It was never really true and it is not true now. Half-cut cell architecture and multi-busbar designs on current mono panels handle partial shading and low irradiance better than any poly module ever did. During Lahore's January smog, when irradiance can drop to a fifth of a clear day for a week, mono N-type keeps a measurably higher share of its rating than the old blue panels did. See winter solar output in Lahore for the seasonal numbers, and monsoon output for the July and August picture.

Where poly still appears, and whether to buy it

Four situations bring poly panels across our path in Lahore.

• Second-hand rooftop removals. A homeowner in Model Town upgrades from 330W poly to 585W mono, and the removed panels enter the used market. They work. They are worth about half of what sellers usually ask.
• Old warehouse stock. Dealers still holding 2019 and 2020 containers. Check the manufacturing date on the label. A panel that has sat in a hot godown for six years has degraded even without generating.
• Tube well and pump projects on farmland. Where roof area is unlimited and cost per watt is the only criterion, cheap used poly occasionally makes sense. Only occasionally.
• Small charging setups. A 150W poly panel for a gate motor or a garden light circuit is fine. Nobody needs N-type efficiency for that.

For a house that will run for the next twenty five years, no. Buy new mono. The difference in lifetime output on a 5 kW build is on the order of 25,000 to 35,000 units, which at PKR 50 a unit is over a million rupees of value for a purchase price difference of maybe PKR 60,000.

An honest caveat about mono

Mono is not immune to bad practice. The bigger risk in Lahore today is not poly versus mono, it is fake or downgraded mono. We have opened cartons labelled 585W that measured 510W under test, and seen counterfeit serial stickers on panels that came from an unknown line. A genuine Tier-1 panel comes with a serial you can verify with the manufacturer, a flash test report for the batch, and an importer who will still exist in five years.

Second caveat: bigger panels are heavier and more awkward. A 645W bifacial module weighs around 32 kg and measures over two metres. On the narrow spiral stairs common in older Gulberg and Garden Town houses, getting them to the roof is a genuine job, occasionally requiring a crane or a rope hoist from the street. Factor that into your install day. Read the 585W panel guide for the practical fitting notes.

What to buy in 2026

Situation	Recommendation
Standard 5 marla or 10 marla home, roof space adequate	Mono PERC 585W at PKR 19,500, best value per rupee
Tight roof, need maximum kW in minimum area	N-type 585W at PKR 25,450
Raised structure over a car porch or open terrace with light-coloured floor	645W bifacial at PKR 21,000
Commercial shed, large unshaded roof	Mono PERC in bulk, lowest cost per watt wins
Farmland tube well, cost is everything	Used poly is defensible if the price is genuinely low

Sizing guides by system: 3 kW, 5 kW and 10 kW hybrid. If you want the panel choice fixed to your actual roof rather than a table, our installation team surveys anywhere in Lahore including Bahria Town and Wapda Town, and you can estimate a build first on the calculator.