In Pakistan, a 10kW solar system needs 17 to 22 panels and a 10kW inverter. Over the course of a year, it makes about 1,000 to 1,300 units of power each month. It works for a big house or a small business that uses at least 1,100 units a month, and most of that use is during the day.
That range is big because output varies on where you live, how much shade there is, the quality of your panels, the amount of dust, and the time of year. This guide tells you how to figure out your own number, how many panels will fit on your roof, what changed with net billing in 2026, and when it’s better to be smaller.
Not a single price will be shown here. There are different quotes for the same 10kW size because of the work and equipment used. We explain why the quotes are different and how to compare them fairly.
What a 10kW solar system includes
The “10kW” rating tells you how much direct current (DC) power the panel array has under normal test settings. That is a lab setting with strong sunlight that is spread out evenly and a cool panel. They are rarely matched by a real rooftop in Karachi or Multan, so the power you get is always less than 10kW. This happens all the time, and the unit estimates further down in this guide take it into account.
A complete system has these parts:
- Solar panels: most new panels are mono PERC or N-type TOPCon, and some are bifacial, which means they also collect light from the rear side.
- Inverter: converts DC from the panels into the alternating current (AC) your home uses. An on-grid inverter works only with the grid. A hybrid inverter also manages a battery. Most 10kW inverters are three-phase.
- Mounting structure: galvanized steel or aluminium frames that hold the panels at the right tilt and resist wind.
- Cables, breakers, surge protection and earthing: the safety layer between the panels, the inverter and your distribution board.
- Metering arrangement: a bi-directional or separate export meter, arranged through your DISCO, if you export power to the grid.
- Battery (optional): lithium or tubular lead-acid, used only in hybrid and off-grid systems.
One mistake with names: some sellers advertize systems with “10kVA” power, but kVA and kW are not the same thing. Check the inverter’s datasheet to see how much AC power it puts out in kW, and then check the panel array’s DC size.
How many units does a 10kW solar system produce?
It’s easy to figure out how much solar power a system produces: system size (kW) times peak sun hours times performance ratio equals units (kWh) per day. The peak sun hours are the times of the day when there is full-strength sunlight. The performance ratio tells you how much of that energy you actually get back after heat, dust, wires, and the inverter take it away. For a well-installed system, it is typical to plan for a performance ratio of 0.75 to 0.80.
Every day, Pakistan gets about 5.3 kWh of sunshine per square meter, which is about 5 peak sun hours. Ten kW times five hours times 0.78 equals 39 units per day, or 1,170 units per month.
To get the size from your bill, flip the formula around. About 1,200 x (30 × 5 × 0.78) = 10.3kW of panels are needed for a home that needs 1,200 units a month. You can use the Peakofsun solar calculator to do this kind of check.
Why unit figures differ so much online
Pakistani pages say that the same 10kW size can sell anywhere from just over 1,000 to well over 1,500 units a month. The gap is usually caused by a few things:
- Some pages quote output on a perfect, clear day instead of an annual average.
- City, roof tilt and direction change the result, and so does shading from tanks, walls and neighbouring buildings.
- Arrays that are slightly larger than the inverter rating produce more than a strict 10kW array.
- Dust, heat and cable losses are often left out of headline figures.
For planning, use the annual average. Then check the monthly pattern against your own bills.
How output changes through the year
| Season | What happens to output | Planning note |
| Summer (April to June) | Long days and strong sun, but hot panels lose efficiency. | High daily energy, though less than the sun hours alone suggest. |
| Monsoon (July to September) | Cloud and humidity cut output on many days. Rain also washes dust off the panels. | Expect large day-to-day swings. |
| Autumn (October to November) | Clear skies and moderate temperatures. | Often among the most efficient months per panel. |
| Winter (December to January) | Shorter days. Fog in Punjab and the north can cut output for several days. | Lowest output of the year. Compare it with your winter bill. |
How many panels do you need for a 10kW solar system?
The number of panels is based on how much power each one has. For the same array size, panels with more wattage mean fewer panels.
| Panel wattage | Number of panels | Array size | Comment |
| 450W | 22 | 9.90kW | Older or smaller-format panels. Needs more roof area. |
| 540W | 19 | 10.26kW | Slightly above 10kW. |
| 550W | 18 | 9.90kW | A very common choice for this size. |
| 580W | 17 | 9.86kW | Fewer panels, but each is large and heavy to handle. |
| 580W | 18 | 10.44kW | Deliberately above 10kW to suit a larger inverter or offset losses. |
| 600W | 17 | 10.20kW | Common with newer N-type panels. |
Array sizes use nameplate watts.
The installers can round the arrangement up or down to make it fit the inverter. It is common for the array to be a little bigger than the inverter’s rating, since panels rarely hit full rating on a real roof. Get the model, wattage, and count written down. If you want to compare this to smaller loads, check out our guide on how many panels you need for each AC.
How much roof space is needed
A large-format panel is about 2.3 m long and 1.1 m wide, which means that 18 panels will cover an area of 45 to 50 square meters. On a flat roof, you need gaps between the rows, walkways, and space around water tanks, parapet walls, and stair rooms. A few installer pages say that a 10kW system needs about 900 square feet of free room.
Use that only as a planning tool. A site survey tells you what your roof can really hold, taking into account things like tilt, direction, and shade at different times of the day.
On-grid, hybrid or off-grid: which 10kW setup fits?
| Feature | On-grid | Hybrid (with battery) | Off-grid |
| Needs the grid | Yes | Yes | No |
| Power during load shedding | No. It shuts down for safety when the grid is off. | Yes, for selected loads. Limited by battery size and inverter backup output. | Yes, within battery capacity |
| Using solar at night | Only through grid imports | Yes, until the battery is empty | Yes, within battery capacity |
| Main equipment | Panels and on-grid inverter | Panels, hybrid inverter and battery | Panels, off-grid inverter and a large battery bank |
| Relative upfront outlay | Lowest | Higher | Highest |
| Best for | Homes with few outages and mostly daytime use | Homes with frequent outages or heavy evening use | Places without a reliable grid connection |
| Main limit | No backup power | Battery ages and needs space and ventilation | Fully dependent on battery size and weather |
For a 10kW system, picking a battery is more important than picking a panel brand. A battery takes up more room, equipment, and planning, so only add one if you need it for power outages or nighttime use. We talk more about on-grid vs. hybrid systems in our guide.
Sizing a battery: a worked example
One inverter AC using 1,000 W for 6 hours (6 kWh), a fridge using 150 W on average for 10 hours (1.5 kWh), and fans and lights using 0.8 kWh are your main nite loads. That adds up to 8.3 kWh. A battery with about 10 kWh of available power would be enough to cover it. If you want to make sure these assumptions are correct for your own appliances, check the nameplates.
Lithium (LiFePO4) batteries can usually handle more daily use and charges. Most of the time, tubular lead-acid batteries need more floor room, can only be discharged slightly each day, and need to be maintained regularly. You can also read our guide to lithium and tubular batteries.
Net billing and your 10kW system in 2026
There were changes to Pakistan’s rules for grid-connected solar in 2026. On February 9, 2026, NEPRA made its Prosumer Regulations 2026 public. Since they replaced the net metering rules from 2015, new applicants are now handled under net billing instead of one-to-one unit offsetting. Dawn’s report on the change is a good place to start: The net-metering service is turned off by Nepra.
In simple terms, you are charged your normal tariff for the units you buy from your DISCO, and you are credited separately for the units you sell at a rate set by the rules that is less than the value of the units you buy. Rates can change, so this article doesn’t list them.
A few other points reported for the 2026 framework:
- New agreements run for five years.
- The system capacity cannot exceed your sanctioned load, unless NEPRA changes that limit.
- People who already held a net metering agreement before 9 February 2026 were reported to keep their existing terms until the agreement expires, provided they do not increase capacity.
- An August 2026 amendment (S.R.O. 1330(I)/2026) reportedly removed the need for NEPRA concurrence for facilities of 25kW or below, leaving approval with the distribution company.
The rules could change again, and each DISKO (like K-Electric, LESCO, IESCO, MEPCO, FESCO, GEPCO, PESCO, HESCO, SEPCO, QESCO, TESCO, or HESCO) has its own application process, so make sure you know what those steps are before you buy equipment. The specifics are kept on our page about net billing and net metering.
What this means for sizing a 10kW system:
- Design around how much power you use in daylight, not around how much you can export.
- Move heavy daytime-capable loads, such as water pumps, washing and ironing, into solar hours.
- If evening use is large, a battery lets you use your own solar power after sunset instead of importing it.
Worked example: a 10kW system for a Lahore home
Assumptions (illustrative, not measured):
- Four summer months at 1,300 units used per month, four shoulder months at 900 units, and four winter months at 700 units. Annual use: 11,600 units.
- The 10kW system generates 1,250 units a month in summer, 1,150 in the shoulder months and 900 in winter. Annual generation: 13,200 units.
- Share of household use that falls in daylight: 55% in summer (daytime AC), 50% in the shoulder months and 45% in winter.
- No battery. Anything generated beyond daytime use is exported.
| Season (per month) | Used | Generated | Used directly from solar | Exported | Imported from grid |
| Summer | 1,300 | 1,250 | 715 | 535 | 585 |
| Shoulder | 900 | 1,150 | 450 | 700 | 450 |
| Winter | 700 | 900 | 315 | 585 | 385 |
| Whole year | 11,600 | 13,200 | 5,920 | 7,280 | 5,680 |
What the example shows:
- About 55% of the system’s annual output (7,280 of 13,200 units) is exported, not used at home. Under net billing, that portion is worth less to the household than the units it avoids importing.
- Reverse-sizing by average use gives a smaller number: 11,600 ÷ 12 ≈ 967 units a month, which needs about 967 ÷ (30 × 5 × 0.78) ≈ 8.3kW of panels.
- A 6kW system would generate 60% of the figures above: 750 units in summer, 690 in the shoulder months and 540 in winter. All three are still above the daytime use, so it would use directly the same 5,920 units a year as the 10kW system, with less exported.
- Adding a battery with about 10 kWh of usable capacity can shift roughly 8 to 9 kWh a day of evening use onto solar, which is about 250 to 270 units a month. That is the case where the extra panels of a 10kW system start to earn their place.
The lesson is to base your size on how much you use during the day and over the course of a year, not on your biggest summer bill. A 10kW system is best when use is high in both summer and winter, when you plan to add loads, or when you want to use it with storage.
Is a 10kW solar system right for you?
It is likely a good fit if
- Your average use over the last 12 months is around 1,100 units or more.
- A large share of your use happens in daylight, for example from several ACs, a water pump or a workshop.
- You have a large, mostly shade-free roof or open area.
- Your connection is three-phase and your sanctioned load supports the system size.
- You plan to add an EV charger, more ACs or a battery later.
A smaller system may suit you better if
- Your use is below roughly 800 units a month for most of the year, with only a short summer spike.
- Your sanctioned load or single-phase supply limits what your DISCO will connect.
- Your roof is small or heavily shaded for part of the day.
- You mainly want backup during outages. In that case, battery capacity and inverter backup output matter more than the panel count.
How to compare 10kW solar quotes without being misled
Two prices for a 10kW system may look very different because they are based on different parts of the system and work. It depends on the type of system (on-grid, hybrid, or off-grid), the brand and phase of the inverter, the battery type and capacity, the quality of the mounting structure, the quality of the cables and protection, how complicated your roof is, and the service the installer offers after the sale. Prices are not given here. You should get written quotes from at least two installers and look over each one line by line.
| Item | What to ask for in writing | Why it matters |
| Panels | Brand, exact model, wattage, number of panels and the datasheet | Wattage and cell technology decide output and roof area. |
| Inverter | Model, AC output in kW, single or three-phase, number of MPPT inputs, warranty | A mismatch in phase or AC rating limits output. |
| Mounting structure | Material, thickness, protective coating, tilt angle, wind rating | The roof is exposed to wind and monsoon rain for decades. |
| Cables and protection | DC and AC cable sizes, breakers, surge protection, earthing | Safety, and lower losses. |
| Battery (hybrid only) | Chemistry, usable kWh, cycle life, warranty terms | Usable capacity, not the nameplate figure, decides backup time. |
| Paperwork | Who handles the DISCO application and inspections, and the expected timeline | Avoids delays and compliance problems. |
| Warranty and service | Panel, inverter and workmanship warranty, plus a local service contact | Tells you who fixes faults. |
| Monitoring | App or portal for daily output | Helps you spot faults and dirty panels early. |
Common mistakes to avoid
- Sizing from one summer bill. Use 12 months of units, and note how much falls in daylight.
- Ignoring sanctioned load and phase. Ask your DISCO what size and connection type it will accept before you order.
- Comparing quotes by kW alone. Compare panel model, inverter AC rating, structure and warranty too.
- Overlooking shade. A tank, stair room or tree shadow in the afternoon can cut output across a whole string of panels.
- Expecting backup from an on-grid system. It switches off when the grid fails.
- Skipping earthing and surge protection. These protect people and the inverter during storms.
- Having no cleaning plan. Dust builds up quickly in dry months, and rain does not clean panels fully.
Maintenance and what to expect over the years
When the panels are cool, like early in the morning or late at nite, rinse them with clean water. Be careful not to scrub them too hard. This app should be checked once a week. If the daily units drop quickly on clear days, it’s likely because of shade, dirt, or a problem. Inverters usually need to be replaced before the panels do because their output slowly goes down over time.
Conclusion
If your average monthly use is high, most of it happens during the day, and your roof, phase, and allowed load can handle it, then a 10kW solar system makes sense. About 1,000 to 1,300 units a month, 17 to 22 panels, and a big roof area are what you can expect. A smaller system can handle the same daily load with less power sent to the grid if it is used less or only during certain times of the year.
Before you decide, look at your last 12 electric bills and make a list of how much you use during the day. Then, decide if outages or evening use make a battery worth it. Keep in mind that net payment rules can change, so check with your DISKO to see what the current process is.
Putting your unit consumption into the Peakofsun solar calculator is a good next step. Then, set up a site survey to check out the shading, roof layout, and connection type in person.