What size inverter do I need for a 1.5 ton AC in Pakistan?

A 1.5 ton inverter AC has 1800 W continuous load. Startup surge: 5400 W (3x running). With a safety margin and other ambient loads (fans, lights, fridge) the inverter should be at least 3 to 5 kVA hybrid. Recommended: 5 kVA hybrid inverter to handle the AC plus the rest of the home comfortably. For 2 ACs running together, step up to 8 kVA.

Hybrid vs on grid vs off grid inverter, which is right for me?

Hybrid: accepts solar + grid + battery, runs loads during load shedding (battery kicks in). Best for most Pakistani homes because load shedding is still real. On grid: solar + grid only, no battery support, cheaper, but shuts off during grid blackouts (anti islanding rule, for grid worker safety). Best for reliable grid areas like central Lahore, DHA Karachi, Islamabad sectors F, G, E. Off grid: solar + battery only, no grid connection. Rare in cities, useful for rural / farmhouse installations where grid is unreliable or absent.

What is the surge factor and why does it matter for AC?

Air conditioner compressors and water motors draw 2.5 to 3x their running wattage for the first fraction of a second when starting. A 1.8 kW (1.5 ton) AC needs an inverter that can briefly handle 5.4 kW. Modern hybrid inverters from Inverex, Solis, Growatt handle this automatically (inverter peak rating is typically 2x continuous), but an undersized inverter simply trips off when the AC tries to start. Our calculator factors this in.

Inverex Nitrox vs Solis vs Knox vs MaxPower, which inverter brand is best in Pakistan 2026?

Premium (Rs 28k per kVA approx): Inverex Nitrox, Inverex Veyron, Solis 5G, Growatt SPF. 5 year warranty, best reliability, widely supported nationally, AEDB approved for net metering. Mid range (Rs 22k per kVA approx): Knox, MaxPower Spider Mate, Tesla Solar Pakistan. 3 year warranty, decent quality, common in Lahore / Karachi. Budget (Rs 16k per kVA approx): Crown, Homage. 2 year warranty, fine for smaller installations or pure UPS replacement. For a long term 5kW+ residential install, go Premium tier, the Rs 30k difference pays back as fewer replacements over 10 years.

Should I oversize my inverter for future expansion?

Yes, but only by one size step (e.g. if 5 kVA is the calculated need, install 6 or 8 kVA). Overshooting too much wastes money and inverters running at very low load (under 20%) have efficiency drops. The 25% safety margin our calculator applies is already a built in oversizing for surge handling and longevity. Add another size step only if you plan to add an AC or EV charger within 2 to 3 years.

What is the difference between kW and kVA?

kW (kilowatts) measures real power. kVA (kilo volt amperes) measures apparent power, which includes reactive power from inductive loads like motors. The relationship is kW = kVA × power factor. For residential mixed loads the typical power factor is around 0.9, so a 5 kVA inverter delivers about 4.5 kW of real power. Manufacturers spec inverters in kVA. When the brochure says 5kW, double check if they mean kW or kVA in fine print.

Do I need anti islanding protection?

Yes, mandatory for any net metering connection in Pakistan. Anti islanding means the inverter automatically disconnects from the grid during a blackout so it does not back feed solar power to dead grid lines (which would electrocute grid maintenance workers). All AEDB approved hybrid and on grid inverters include anti islanding by default. Off grid inverters do not need it because they never connect to the grid.

How long does a solar inverter last in Pakistan?

Premium hybrid inverters (Inverex, Solis, Growatt): 10 to 15 years of normal operation, with a 5 year warranty period. Mid range (Knox, MaxPower): 7 to 10 years. Budget (Crown, Homage): 5 to 7 years. Hot Pakistani summers shorten life by 10 to 20% if the inverter is in a poorly ventilated room. Install in a shaded, cool, dry indoor location for maximum life. Avoid exterior wall mounting in direct sun.

Solar Inverter Size Calculator Pakistan

Pick your appliances and the tool returns recommended kVA size + Pakistani brand picks (Inverex, Solis, Knox, MaxPower) at 3 price tiers with surge handling for AC + water motors.

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About the Solar Inverter Size Calculator Pakistan

Free Pakistani solar inverter sizing calculator. Pick the appliances you want to run together (fans, lights, AC, fridge, water motor) and we calculate the right kVA size factoring in 25% safety margin on continuous load AND the surge load for inverter AC startup (3x running watts) and water motor startup (2.5x). Output is the recommended size rounded up to a standard Pakistani inverter size (1, 1.5, 2, 3, 4, 5, 6, 8, 10, 12, 15 kVA) plus brand picks across three price tiers, Premium (Inverex Nitrox / Veyron / Aerox, Solis, Growatt), Mid range (Knox, MaxPower Spider Mate, Tesla Solar Pakistan), and Budget (Crown, Homage). Also explains hybrid vs on grid vs off grid choice so Pakistani users do not over pay for features they do not need.

How this works: pick the appliances you want to run at the same time on the inverter. We add a 25% safety margin on continuous load AND check that the inverter can handle AC / motor startup surge (3x for AC, 2.5x for water motors). Output is the recommended kVA size rounded up to the nearest standard size sold in Pakistan, plus brand picks at three price tiers.

Lighting

LED bulb 9 W

9 W each

LED bulb 12 W

12 W each

LED bulb 18 W

18 W each

Tubelight 40 W

40 W each

Energy saver 25 W

25 W each

Fans

Ceiling fan

75 W each

Pedestal fan

60 W each

Exhaust fan

45 W each

Cooling (AC + cooler)

Inverter AC 1 ton

1200 W each

Inverter AC 1.5 ton

1800 W each

Inverter AC 2 ton

2400 W each

Air cooler

180 W each

Kitchen

Refrigerator (avg running)

150 W each

Deep freezer (avg running)

250 W each

Microwave oven

1100 W each

Electric kettle

1500 W each

Blender / juicer

400 W each

Laundry

Washing machine

500 W each

Iron

1000 W each

Geyser (electric)

2000 W each

Water motor / pump

Water motor 0.5 HP

375 W each

Water motor 1 HP

750 W each

Water motor 2 HP

1500 W each

Submersible pump 1 HP

750 W each

Electronics

LED TV 32 inch

60 W each

LED TV 43 inch

90 W each

LED TV 55 inch

120 W each

Laptop

65 W each

Desktop computer

200 W each

WiFi router

15 W each

Phone charger

18 W each

Other appliance wattage (optional)

Anything not in the list above.

Use case

Inverter sizing result

Continuous load

2,475 W

Surge load (with AC / motor startup)

6,075 W

Minimum kVA needed

6.75 kVA

Recommended size

8 kVA

Pakistani inverter brands for 8 kVA hybrid

Premium

Inverex Nitrox

5 years warranty. Pakistan assembled, AEDB approved, widely supported.

Premium

Inverex Veyron

5 years warranty. Premium tier from Inverex, larger sizes (10+ kVA).

Premium

Inverex Aerox

5 years warranty. Inverex on grid only line for net metering, common in residential.

Premium

Solis (Ginlong)

5 years warranty. Chinese tier 1, strong global reliability record.

Premium

Growatt

5 years warranty. Popular hybrid range, good service network in Lahore and Karachi.

Mid range

Knox

3 years warranty. Pakistan local brand, decent mid market option.

Mid range

MaxPower Spider Mate

3 years warranty. Popular hybrid in Pakistani market, good aftermarket parts.

Mid range

Tesla Solar (Pakistan)

3 years warranty. Pakistani brand (no relation to Tesla US), wide dealer network.

Budget

Crown

2 years warranty. Budget choice, common in smaller cities.

Budget

Homage

2 years warranty. Local mass market brand, mostly for UPS plus solar combo.

Premium tier estimate

Rs 224,000

Mid tier estimate

Rs 176,000

Budget tier estimate

Rs 128,000

Why oversize? Running an inverter at 100% capacity all day kills it within 1 to 2 years. The 25% safety margin (continuous load) is industry standard. AC startup surge can be 3x the running wattage for a fraction of a second, so a 1.8 kW AC actually needs an inverter that can handle 5.4 kW for that instant. Modern hybrid inverters self protect, but an undersized unit will simply trip and shut off the load instead of starting the AC.

Hybrid vs on grid: hybrid lets you run loads from battery during load shedding; on grid (anti islanding) shuts off solar when the grid is down for grid worker safety. For most Pakistani homes a hybrid inverter is the right pick because load shedding is still real, especially in summer.

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How to use the Solar Inverter Size Calculator Pakistan

Pick the appliances you want running on the inverter at the same time (continuous load): fans, lights, AC, fridge, motor, electronics.
Add any custom wattage for appliances not listed (workshop tools, gym equipment).
Choose use case: Hybrid (battery + grid + solar, can run during load shedding), On grid (net metering only, shuts off in blackout), or Off grid (no grid connection, solar + battery only).
Read the recommended kVA size; we round up to the next standard inverter size sold in Pakistan to give you a 25% safety margin on continuous load.
Compare Premium / Mid range / Budget brand picks with approximate price tiers, warranty terms, and AEDB approval status before talking to vendors.

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Solar Inverter Size Calculator Pakistan

About the Solar Inverter Size Calculator Pakistan

How to use the Solar Inverter Size Calculator Pakistan

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