What Size Solar Inverter Do You Need for Your House in Pakistan?

↓This is the question that determines whether your solar system works or frustrates you. An undersized inverter trips during load shedding when multiple appliances run simultaneously. An oversized inverter costs more than necessary and sometimes operates less efficiently at partial load. The right size is calculated from your actual usage, not from a general recommendation based on house size alone.

House size does not determine inverter size. Load does.

Step 1: List Your Simultaneous Running Loads

Write down every appliance you will run at the same time during peak usage, which in most Pakistani homes is the evening when the grid is most likely to fail:

A typical 10-marla Pakistani home running during load shedding might have the following:

• 4 ceiling fans at 75W = 300W
• 10 LED lights at 12W = 120W
• Refrigerator = 150W
• Television = 100W
• WiFi router = 20W
• One 1.5-ton inverter AC = 900W to 1,200W running

Total running load = approximately 1,590W to 1,890W

Step 2: Find Your Highest Startup Draw

This determines your required surge capacity.

Air conditioner compressors, refrigerator compressors, and pump motors draw two to three times their running wattage for two to three seconds at startup. A 1.5-ton inverter AC running at 900W may draw 3,000W to 4,000W at startup.

Your inverter must handle this surge without tripping. Check the inverter’s surge rating (listed in kVA in the spec sheet) and confirm it exceeds your highest startup draw with reasonable headroom.

Step 3: Apply a Capacity Buffer

Your Inverter Should Not Run at Maximum Capacity Daily

An inverter operating at 90% to 100% of its rated capacity every day runs hotter, stresses its components more, and has a shorter service life than one operating at 60% to 80%. Add 20% to 30% to your calculated peak load to determine the minimum inverter size.

Using the example above: 1,890W peak running load × 1.25 = 2,362W minimum continuous capacity. This points toward a 3 kW inverter as the absolute minimum. But if you add a second AC unit, a washing machine during load shedding, or any other high-draw appliance, you immediately need 5 kW to 6 kW of capacity.

A Practical Size Guide for Pakistani Homes

Choosing the right inverter size is not about buying the biggest system available. It should match your home’s actual peak load, appliance usage, and future energy requirements. An undersized inverter creates performance issues, while an oversized system increases upfront costs unnecessarily. Use this practical guide to estimate the most suitable inverter range for different property types in Pakistan.

• Apartment / Small Flat

Typical Peak Load → 800W to 1,200W
Recommended Inverter Size → 1.5 kW to 3 kW
Suitable for lights, fans, TVs, refrigerators, and basic daily usage.

• 5 Marla House with 1 AC

Typical Peak Load → 1,500W to 2,000W
Recommended Inverter Size → 3 kW to 5 kW
Good for households running essential appliances with moderate cooling demand.

• 10 Marla House with 1 to 2 ACs

Typical Peak Load → 2,000W to 4,000W
Recommended Inverter Size → 5 kW to 8 kW
Works well for medium-sized homes with extended daytime and evening usage.

• 1 Kanal House with 2 to 3 ACs

Typical Peak Load → 4,000W to 7,000W
Recommended Inverter Size → 8 kW to 12 kW
Ideal for larger households with multiple rooms and higher cooling requirements.

• Small Office or Shop

Typical Peak Load → 2,000W to 5,000W
Recommended Inverter Size → 5 kW to 10 kW
Designed to support business continuity and daytime commercial operations.

The Phase Question: Single or Three

Most Pakistani residential properties run on a single-phase grid connection. Max Power’s Voltas HYD 8K-H6 Pro and Voltas 8K-H4 cover the mainstream 8 kW single-phase residential segment. For commercial properties with three-phase connections, the Voltas HYD 15K-H6 Three Phase and Voltas 14K-H4 Three Phase are the appropriate specifications.

If you are unsure whether your property runs on single or three-phase power, check your DISCO electricity meter. Single-phase meters have two wires. Three-phase meters have four wires. Alternatively, check your electricity bill, which in Pakistan specifies the connection type on commercial accounts.

Size for Future Load, Not Just Current Load

If you plan to add a second AC unit, an electric vehicle charger, or additional office equipment in the next two to three years, size the inverter for that future state now. Replacing an inverter prematurely because you undersized it at purchase is significantly more expensive than choosing the next size up from the start.

Explore the full Max Power inverter range for all capacity options from compact residential to large commercial.

Frequently Asked Questions

What size inverter do I need for a 10 marla house in Pakistan with one AC?

A 10 marla home with one 1.5-ton inverter AC and standard household loads typically needs a 5 kW to 8 kW hybrid inverter. The Voltas HYD 8K-H6 Pro at 8 kW is a well-matched option with headroom for load growth. For a more economical alternative, Max Power’s PV Tech series covers 5 kW to 6 kW capacity for indoor installation.

Can I use a 5 kW inverter for two air conditioners?

Typically no. Two 1.5-ton inverter AC units have a combined running load of approximately 1,800W to 2,400W with startup surges of 6,000W to 8,000W. A 5 kW inverter with an 8 kVA surge handles this borderline at best and may trip on simultaneous startups. An 8 kW to 10 kW inverter is the safer specification for two AC units running simultaneously.

Does inverter size affect how much electricity I save from solar?

Inverter size determines how much AC power the system can deliver to your loads. A larger inverter paired with a larger panel array generates more electricity, which translates to more bill savings. However, an oversized inverter not matched to the panel array and load profile does not generate proportionally more savings. The system works best when inverter capacity, panel capacity, and battery capacity are sized together.

Is a 3 kW or 5 kW inverter better for a 5 marla home?

For a 5 marla home with one small AC unit, fans, lights, and standard appliances, a 5 kW inverter provides appropriate headroom for simultaneous operation and future load growth. A 3 kW inverter works for basic loads without AC. If there is any likelihood of adding a first or second AC unit within three years, starting at 5 kW avoids premature replacement.

Do You Know Your Peak Load Before Choosing Your Inverter Size?

Every inverter sizing mistake in Pakistan comes down to the same cause: the load was not calculated before the inverter was chosen. Spend 10 minutes listing your simultaneous loads, identify the highest startup draw appliance, and add a 25% buffer. That calculation gives you the minimum inverter size you should be considering.

Contact Max Power for a free load assessment and inverter sizing recommendation.