How to Size Your Solar System in Pakistan: From 3kW to 20kW

Choosing the right solar system size is one of the most important decisions when investing in solar energy for your home or business in Pakistan. The wrong size can either leave you short of power during load shedding or cost you more than necessary. In this guide, we’ll break down how to size your solar system in Pakistan—from 3kW to 20kW—based on your energy needs, budget, and goals.

Why Solar System Sizing Matters

• Ensures you generate enough electricity for your household or business.
• Helps maximize your ROI (Return on Investment).
• Reduces dependency on WAPDA during load shedding.
• Prevents overspending on extra panels and batteries you don’t need.

Step 1: Calculate Your Electricity Consumption

The first step is to know how much power you use. Check your electricity bill for your monthly kWh (units). On average:

• A small home in Pakistan uses around 300–400 units per month.
• A medium-sized family home consumes 500–800 units per month.
• A large home or villa may use 1,000–1,500+ units per month.
• Shops and small businesses typically consume 1,500–3,000 units per month.

Step 2: Match Load With Solar System Size

Here’s a quick breakdown of what each solar system size can typically support in Pakistan:

3kW Solar System (Small Homes / Apartments)

• Runs: 8–10 fans, 12–15 lights, 1 fridge, 1 LED TV, small appliances.
• Monthly Units Covered: ~350–400 units.
• Best for: Small families, apartments, or backup power.

5kW Solar System (Medium Homes)

• Runs: 12–15 fans, 15–20 lights, 1–2 fridges, 1–2 LED TVs, 1 inverter AC.
• Monthly Units Covered: ~600–700 units.
• Best for: Medium homes with 4–6 members.

10kW Solar System (Large Homes / Small Shops)

• Runs: Multiple fridges, 2–3 inverter ACs, washing machine, fans, lights, computers.
• Monthly Units Covered: ~1,200–1,300 units.
• Best for: Large households, small shops, or offices.

15kW Solar System (Large Homes / Businesses)

• Runs: 4–5 inverter ACs, refrigerators, freezers, water pump, fans, lights, heavy appliances.
• Monthly Units Covered: ~1,800–2,000 units.
• Best for: Large villas, restaurants, or mid-size businesses.

20kW Solar System (Commercial Use)

• Runs: Offices, shops, small factories, hotels, or very large homes.
• Monthly Units Covered: ~2,500–3,000 units.
• Best for: Businesses with high electricity bills.

Step 3: Factor in Net Metering

In Pakistan, net metering allows you to sell excess electricity back to the grid. If your system generates more than you consume, you get credits that lower your bill. This means:

• Bigger systems like 10kW–20kW become more profitable long-term.
• Even if your daytime usage is low, the grid absorbs your surplus energy.

Step 4: Consider Battery Backup (Optional)

If you want power during load shedding or nighttime, add batteries:

• 3kW–5kW systems: Usually 1–2 batteries.
• 10kW+ systems: Require multiple batteries, which increase cost.
• Hybrid systems (solar + grid + batteries) are the most flexible option.

Costs of Solar Systems in Pakistan (2025)

Average market prices (can vary by brand & installer):

• 3kW System → PKR 400,000 – 500,000
• 5kW System → PKR 650,000 – 800,000
• 10kW System → PKR 1.2M – 1.5M
• 15kW System → PKR 2.0M – 2.4M
• 20kW System → PKR 2.8M – 3.2M

Final Advice: Choosing the Right Size

• Start with your electricity bill to estimate monthly units.
• Think about whether you want just savings or backup power too.
• If your budget allows, go for net-metering systems (5kW+) for long-term ROI.
• Always choose a trusted installer like Apex Solar for proper design and installation.

FAQs

Q1: Which solar system size is most popular in Pakistan?
The 5kW solar system is the most common, as it fits the needs of medium households.

Q2: How many solar panels are required for a 10kW system?
Around 24–28 panels (depending on panel wattage, usually 370–450W).

Q3: Can I upgrade my solar system later?
Yes, you can start small (e.g., 5kW) and expand by adding more panels and batteries.

Q4: Does a 20kW system make sense for homes?
Only if you have very high electricity bills or want to profit from net metering.