Prism Solar Guide

6:00 amExample rooftop

Dawn. The panels are still waiting for the sun.

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One example roof on an average Karachi day, after heat and dust losses. The hour-by-hour curve is illustrative.

The multitude of sellers brings on buyer’s paralysis. Accelerated obsolescence of models and methods gives you anxiety. You would invest in a smart panel only to learn that it has turned dumb a month later because a bored farmhand in Turbat cracked its code and put his local jugard on TikTok. Exploratory financial conversations with vendors come with a prerequisite of a degree in Applied Electromagnetics. The last time you said kilowatt was in class four.

Whoever I spoke to said they were thinking of switching to solar but admitted they had not even started their research yet. Therefore, in this piece I have tried to develop a roadmap for every reader strongly considering solar but unable to get the ball rolling. This map was built with the input of those who have installed solar systems at their homes; those who live with them and are reaping the benefits (read: savings) every day.

I supplemented this information with advice from an energy expert, an engineer who installs solar systems for a living, and a particularly clever homeowner who installed and has been running a self-designed solar system for over two years.

You can follow the pathways here before you get on the phone with any vendor. I’ve included the traps that end up costing unassuming consumers money. At the end of the piece, you’ll find a tool that turns your own electricity bill into rough numbers, so you get a sense of what you need before a vendor sets the terms for you.

Why Solar?

The basic question is: why would you bother installing solar? Irfan Bawani, a Karachi homeowner, did it in May 2024. His family’s average electricity use ran up to 1500 units a month. With taxes and surcharges, the bill came to about Rs80,000. Despite the address being in a so-called “load-shedding free” zone, the power still went often, without notice, “in the name of maintenance.”

“For me, the solar project is not just a project to reduce the electricity bill,” he says. “It is for comfort, family comfort, a stress-free life, peace of mind, and long-term sustainability.” Two-and-a-half years later, his grid bill is zero and he expects to recover his investment in months.

That’s the destination. This is how you get there.

Step 1 of 8

Crunch the right numbers

The instinctive first move is to average your monthly power units: add up a year of bills and simply divide by twelve. This calculation tells you how much energy you use per month. But Usama Usman of PRIED (a thinktank working on just and sustainable energy), the first person I spoke to for a plain-language grounding, pushed back on the idea of averages. When you’re sizing up a system, he said, what matters is your peak demand: the moment when the most appliances in your house are running at once.

Tip: Your peak demand is that moment when the most number of appliances in your house are running at once.

“Think of a day when everything is on,” he says. Three air conditioners, the fridge, the deep freezer, several fans and lights together? That combined load, not a gentle monthly average, is what your solar panels have to be able to cover. This is how you can gauge it: an iron rated at 1,000 watts, running continuously for one hour, burns one unit of electricity. String enough of those together and you can feel your peak electricity load weighing down your pockets.

An iron rated at 1,000 watts, running continuously for one hour, burns one unit of electricity

Engineer Farrukh Abid at Nizam Energy sends an engineer to your house, asks the family to switch on their full load, and clamps a meter on the line to read the real draw. For a home with two one-ton ACs, a fridge, a deep freezer, and the usual lights and fans, he typically lands on around 6 kW. Crucially, he revises it 20% to 25% upwards to leave a margin for cloudy days, monsoon weeks, and energy lost in wiring. A 5 kW system, he reckons, makes roughly 20 units on a good day, or about 500–600 units a month.

The tool at the bottom of this page does this first step for you: put in your rupee bill or your number of units. It will spit out a rough estimate of your average electricity use, your summer peak, and a rough system size you would need. Use these numbers as a starting point to test against whatever a vendor tells you.

Step 2 of 8

Understand your climate

Any installer who quotes you a single, flat, round-number output for the year might as well be quoting from fiction. In the city by the sea, that fiction is unravelled by its unique climate. For one thing, rooftop temperatures in Karachi climb to 60–70°C on dark surfaces in the hottest months. If you thought solar output only increases with rising temperatures, you’re wrong. Solar panels actually lose output as they heat up, like any machine made of electrical components. So, you can expect electricity generation to dip from May to August, exactly when your ACs are working full-time.

Within 2 to 3 kilometres of the coast, the salty air corrodes ordinary aluminium frames within a few years. The fix is not easy either: anodised aluminium, stainless-steel components and marine-grade fasteners can withstand the harsh environment. They cost more and must be specified from the outset. Experienced installers avoid creating corrosion traps by using compatible metals, sealing exposed joints and ensuring water can drain rather than pool around the mounting hardware. It is a small detail that can make a big difference.

In a coastal climate, even choosing the cheapest mounting system can turn into premature rust and expensive repairs long before the panels themselves reach the end of their useful life. For Karachi homeowners, corrosion resistance should therefore be treated as a core part of the solar system, not an optional upgrade.

“The well-known brands do a very good job. I fixed meetings with them, learned the pros and cons of every product, and only then decided.”
Irfan Bawani, homeowner

Step 3 of 8

Talk to lots of vendors. Then, talk to some more.

This is where Irfan’s story becomes the method in this madness. He took meetings with all the names: Beyond Green, Sky Electric, and others. Their quotes ranged from about Rs 2.5 million to Rs 3 million, and they suggested systems of 12 to 15 kW. He wasn’t shopping so much as studying. “I was soaking up their knowledge,” he said, collecting each firm’s reasoning, their view on panels, inverters, batteries and structure, and setting it all on one page.

Then he did something most buyers don’t. He designed his own system from that pooled knowledge, settling on N-type bifacial panels and a Sungrow inverter, and had it sourced and installed by a local firm in his area, Green Energy, for around Rs1.9 million: roughly 70% of what the big groups had quoted. His insight about why that gap exists is worth pausing for:

“A company’s real work is installation: the wiring, the earthing, the structure. The panels, inverters and batteries, you can price yourself. That’s the one-stop-shop model; you just have to know what things cost in the market.”
Irfan Bawani, homeowner

If you do choose to go with a vendor, before you hand over a deposit, make one boring government check: make sure the installer is on the PPIB’s current list of companies certified under the AEDB (Certification) Regulations, 2021. AEDB was merged into PPIB in 2023, and PPIB maintains the official list of certified solar installers.

Tip: Make sure the installer is on the PPIB’s current list of companies certified under the AEDB (Certification) Regulations, 2021

This matters if your household system is being installed for net metering, a billing system that compensates users for excess power generated and sent back to the grid. PPIB’s guidance requires systems up to 250 kW to be installed through a certified installer. So rather than taking a vendor’s word for it, ask for the company’s certificate number and check it against the official list.

Bawani’s check-before-you-pay rule applies to equipment as well. He compared the panels installed at his house with the shipment’s paperwork (including the packing list and proforma invoice) and checked the panel serial numbers and other identifying details. Buyers can also use the manufacturer’s own verification tools: JinkoSolar, for example, provides serial-number authentication for its modules, while LONGi allows buyers to check a module using its product barcode/QR code.

If the number on the panel does not match the paperwork or the manufacturer’s records, stop and ask questions before accepting the equipment.

Step 4 of 8

What do you actually want solar to do?

Abid says you have three choices.

On-grid keeps your solar system connected to K-Electric’s network: your panels generate electricity for your home, any surplus can flow back to the grid through the appropriate two-way metering arrangement.
Off-grid cuts the cord entirely, relying on an inverter and battery to keep the house running without K-Electric.
Hybrid sits between the two: you stay connected to the grid, but add a battery so you have stored power to fall back on when the grid goes down.

Two pieces of hardware explain most of the jargon. Solar panels produce direct current (DC); your appliances run on alternating current (AC). The inverter converts one into the other and controls how electricity moves between your panels, your house, the battery and, where applicable, the grid. A battery only enters the picture if you want to store electricity for later. For a straightforward on-grid system, as Usman noted, a battery is not automatically necessary.

The important thing is not to choose between the three labels first. Start with the problem you want solar to solve. If your priority is cutting your electricity bill, an on-grid system may be enough. If you want the house to keep running during load-shedding, you need backup, which means a battery and an inverter designed to supply your home when the grid is unavailable. If you want to operate independently of K-Electric, you are looking at off-grid and that means sizing both your solar generation and your battery storage for the periods when the sun isn't producing enough electricity.

There is one practical detail that can rule a system in or out before you get as far as the panels: your electricity connection. Under the current Prosumer Regulations, a consumer applying to interconnect a distributed-generation system must have a three-phase 400V or 11kV connection. So don't assume that any house can simply have any size solar system connected to its existing meter. Check your connection type and eligibility with K-Electric before you build a quote around a particular system size.

For the same reason, the inverter is not just another box on the quote. Engineer Abid puts single-phase inverters at roughly Rs 170,000 to Rs 200,000 and three-phase models at around Rs 250,000 to Rs 300,000, depending on capacity. Those are his reported market figures, not fixed prices, but they illustrate why the electrical configuration of your home matters to the cost of the system.

If you are comparing vendors, ask them to break that cost down. You should be able to see what you are paying for the panels, inverter, battery if required, mounting structure, wiring and protection equipment, installation and the grid connection or metering work. Once those pieces are separated, “a 10kW solar system costs X” becomes a much more useful question: you can actually see what is inside the number.

Step 5 of 8

The 2026 rule that changed the maths

Until February 2026, households on net metering could offset the electricity they exported against what they consumed from the grid. That system is now closed to new applicants. New installations fall under net billing, in which exported electricity is bought at a lower rate than the rate households pay when they draw electricity from the grid.

Old users, said Usman, were credited on the order of Rs 22 a unit. That regime has closed to new applicants. New systems now go on net billing, where your exported units earn a much lower, centrally set rate of around Rs 10 a unit by his account. The change makes sending excess power to the grid less valuable and makes using your own solar power, or storing it in a battery, more important to the calculation.

Anyone who installed under the old rules keeps them for the remainder of their term, but the moment they expand a system, they’re pushed onto net billing. That’s why many older prosumers have frozen their plans to add panels. Bawani is one of them: his primary system is a 15 kW on-grid array on an oversized 20 kW inverter he bought expecting to grow into it. He won’t now, because expanding would forfeit his grandfathered net-metering rate.

“No one will install an on-grid system now, and no one should. Install hybrid.”
Irfan Bawani, homeowner, on how the new rules have shifted his advice

That’s his opinion, shaped by his own grandfathered position; a household that mainly wants to shave a daytime bill may still find on-grid worthwhile. If you are installing solar in 2026, calculate how much electricity you will use yourself before deciding how much to export. The interactive below lets you see the gap between the old and new export rates for your own numbers.

The exact rupee figure KE prints on a net-billing bill could not be put in this article as KE failed to respond to our queries. The numbers above are based on research and what interviewees said. Treat them as the shape of the change, not the final decimal.

Step 6 of 8

KE’s silence

If you’re not choosing net metering, you do not need permission to install and run a system for your own use. The moment you want to export to the grid, though, you enter KE’s jurisdiction, which involves going through an application, a technical review, an agreement, a fee, and a meter swap. Usman estimated the licence itself takes around 30 days, with KE assigning a meter sized to your declared consumption. The generation licence carries a fee of Rs 1,000 per kilowatt, and the applicant bears the cost of the bi-directional meter.

One honest declaration matters here: don’t under-report. If you install 10 kW but tell KE you have 5 kW and take a 5 kW licence, more power than you’re licensed for flows to the grid, and that can draw a penalty. (Some households run two inverters, one for the house and one that exports, to keep within a licensed limit: a workaround, not a shortcut you should improvise alone.)

We wanted to ask KE about the system: how the process runs on their end, what’s changed over a decade of net metering, how many households have shifted and how bills moved. Dawn sent KE a detailed question bank and followed up more than once. Despite the reminders, we received no response. The application form, at least, is free to download from KE’s net-metering page.

Step 7 of 8

What it costs, and how people pay for it

Prices move fast enough that any figure here is a snapshot, not a promise. As a marker: Abid quoted a 6 kW system at around Rs 1.2 million, with panels in the region of Rs 40–42 a watt and inverters priced by size and phase as above. Bawani’s 15 kW system, 26 N-type bifacial panels on a 20 kW inverter, came in at nearly Rs1.9 million two and a half years ago, when, as he cheerfully admits, “prices were completely different.”

The tool below turns a quote into a price-per-watt so you can hold whatever you’re offered against a current benchmark rather than a memory.

On financing, the menu is genuinely wide: bank products from Meezan, Faysal, Soneri, JS, Mobilink, Allied, Bank Alfalah and HBL, alongside provincial schemes such as Sindh’s Roshan Ghar, Punjab’s Roshan Gharana and the KP Solar Initiative. But rates and terms differ enough, and change often enough, that quoting a stale number would be misleading.

Two more of Abid’s pointers save money later. You can start small and expand (a 5 kW inverter can carry up to about 8 kW of panels, so many people begin at 5 kW and grow); and inverters and batteries typically ship with a five-year warranty, which you should get in writing.

Step 8 of 8

It’s on the roof. Now what?

Solar is low-maintenance, not no-maintenance, and in Karachi the maintenance is mostly about dust. Bawani washes his panels twice a month, at roughly Rs 1,500 a visit from a service near his home; he doesn’t climb the big structure himself. Skipping the washing and dust alone can cost you a tenth of your output. Once a year he has the structure surveyed (nuts, bolts, welding and paint checked after months of wind and weather) for around Rs 5,000–6,000.

A modern kit largely looks after itself otherwise. Today’s inverters and batteries connect to phone apps that show what you’re generating, storing and sending to KE in real time. They are, usefully, the same apps that let you verify a panel’s authenticity and catch a fault early. Bawani watches his on days when the sky is clear and the system runs at full tilt, and on the cloudy weeks when it doesn’t. That visibility is its own reassurance: you can see the investment working in real time.

‘Let’s go solar!’ But how do we get there?