Load Calculation for
Solar System in Pakistan
Complete Step-by-Step Guide
Confused between 3kW, 5kW, 8kW, or 10kW? This fully updated guide helps you calculate your actual electrical load and choose the right solar system — with March 2026 prices for homes, shops, offices and commercial properties across Pakistan.
Why Load Calculation Matters Before Buying Solar
Load calculation for your solar system is the single most important step before you buy a single panel, inverter, or battery. At Pak Solar Traders, customers who skip this step either end up with a system too small for their needs — causing frustration and extra cost — or an oversized system that wastes money on components they never fully use. Getting the size right from day one is what separates a satisfying solar investment from a regrettable one.
Correct System Size
Know exactly how many kilowatts of solar you actually need based on your real daily energy use — not a salesperson’s guess.
Right Inverter Selection
Match inverter capacity to your running load and account for startup surge of heavy appliances like ACs and water pumps.
Accurate Battery Sizing
Size your lithium or lead-acid battery bank precisely for the hours of backup you actually need during load shedding.
Cost Optimisation
Avoid overspending on unnecessary panels, oversized batteries, or inverter models that don’t match your actual load requirements.
Start by listing every electrical device you want to run on your solar system. For each appliance, record the wattage (printed on the label or found in the manual), quantity, and how many hours per day you use it. Do not guess — be as accurate as possible.
| Appliance | Wattage | Quantity | Hours/Day | Daily Energy (Wh) |
|---|---|---|---|---|
| LED Lights | 10W each | 10 | 6 hrs | 600 Wh |
| Ceiling Fans | 75–80W each | 4 | 8 hrs | 2,560 Wh |
| Inverter Refrigerator | 150–200W | 1 | 8 hrs effective | 1,600 Wh |
| LED Television (42″) | 80–100W | 1 | 4 hrs | 400 Wh |
| Inverter AC (1 Ton) | 1,000–1,200W | 1 | 5 hrs | 6,000 Wh |
| Washing Machine | 400–500W | 1 | 1 hr | 500 Wh |
| Total Daily Consumption | — | — | — | 11,660 Wh / 11.66 kWh |
Apply this formula to each appliance individually, then add all results together:
After calculating each appliance separately, sum all daily Wh values. This total is how much energy your solar panels need to generate every single day to keep your household fully powered.
Divide your total daily energy need by the available solar generation capacity, factoring in real-world efficiency losses.
For most cities in Pakistan, use 5.5 peak sun hours and 0.80 (80%) system efficiency to account for inverter conversion losses, cable resistance, dust on panels, and high-temperature derating.
If you want backup during load shedding or night hours, battery sizing becomes a critical decision. Calculate required capacity based on the specific load you want to run during outages and for how long.
Crown CMLB 51.2V 100Ah (5.12kWh) — Rs. 262,000 · Best for 5–6kW systems
Crown CMLB 51.2V 230Ah (11.7kWh) — Rs. 557,000 · Best for 10kW systems
6,000+ charge cycles · 15+ year life · BMS built-in · No maintenance required
The inverter must handle your maximum simultaneous running load plus a safety buffer for startup surge. Compressor-based appliances — air conditioners, refrigerators, water pumps — draw 2–3x their rated wattage for the first 2–3 seconds at startup.
3kW Hybrid: Crown / Fronus — Rs. 100,000–140,000
5kW Hybrid: Crown Xavier — Rs. 128,000–145,000 · Solis 5kW — Rs. 185,000–210,000
6kW Hybrid: Crown Xavier ii — Rs. 140,000–163,000 · Solis 6kW — Rs. 228,000–255,000
8kW Hybrid: Inverex Nitrox — Rs. 265,000 · GoodWe 8kW — Rs. 315,000
10kW (9.8kW) Hybrid: Crown Nova — Rs. 332,000 · Solis 10kW — Rs. 380,000–420,000
Using modern high-efficiency Tier-1 panels (540W–610W), here is how many panels each common system size requires. Prices are per-watt market rates as of March 2026.
Load Scenarios — Which System Do You Need?
Find your closest match in the table below for a rapid size estimate. These are real-world scenarios for Pakistani homes and businesses.
| Your Appliances / Usage Pattern | Recommended System | Approx. Installed Price (Mar 2026) | Suitable For |
|---|---|---|---|
| LED lights + 3–4 fans + 1 fridge + TV + no AC | 3kW Hybrid | Rs. 380,000–480,000 | Small home (3 marla), apartment |
| Fans + lights + fridge + 1 inverter AC (1 ton) + washing machine + TV | 5kW Hybrid | Rs. 600,000–750,000 | Average family home (5–8 marla) |
| 2 ACs (1.5 ton) + full household load + water pump | 8kW Hybrid | Rs. 900,000–1,150,000 | Large home (8–12 marla) |
| 3+ ACs + full heavy residential or office/shop load | 10kW Hybrid | Rs. 1,200,000–1,500,000 | Kothi, office, shop, commercial |
| Factory / school / hospital — three-phase load | 15–50kW On/Hybrid | Rs. 1,800,000–8,000,000+ | Industrial, commercial, institutional |
Which Solar System Is Best for You?
Detailed breakdown of each system size — what it can power, what it costs, and who it’s best suited for based on current Pakistan market conditions.
3kW hybrid inverter
No AC
Small roof ≥18m²
5kW hybrid inverter
1 AC max
Roof ≥28m²
8kW hybrid inverter
2–3 ACs
Roof ≥40m²
9.8–10kW hybrid inverter
3–4 ACs
Roof ≥50m²
Important Tips Before Buying Your Solar System
Solar Load Calculation FAQ — Pakistan 2026
How do I calculate my solar system load in Pakistan?
List all appliances with wattage and daily usage hours. Multiply watts × hours for each to get daily Wh. Sum all values for total daily energy. Divide by (5.5 × 0.80) = 4.4 to get minimum PV watts required. Add 20–25% safety margin. Alternatively, take your average monthly WAPDA units (from the last 12 bills), divide by 30, and that is your daily kWh target. Pak Solar Traders provides free load assessments — just call 0332-4129441.
Which solar system size is right for my home in Pakistan?
Quick guide: 3kW (small home, no AC, Rs. 380,000–480,000), 5kW (average home, 1 AC, Rs. 600,000–750,000), 8kW (large home, 2–3 ACs, Rs. 900,000–1,150,000), 10kW (kothi or office, 3–4 ACs, Rs. 1,200,000–1,500,000). The exact right size depends on your actual appliance list, roof space, and budget. A free site survey from Pak Solar Traders will determine the exact specification for your property.
What is the cost of a 3kW solar system in Pakistan March 2026?
A complete installed 3kW hybrid solar system in Pakistan costs Rs. 380,000–480,000 (March 2026) without battery storage. This includes approximately 5–6 Tier-1 panels (540–580W), a 3kW hybrid inverter, L2 structure, wiring, earthing, and professional installation. Adding a lithium battery (2–3kWh) adds approximately Rs. 120,000–180,000. This system suits small apartments and homes running fans, lights, fridge, and TV without air conditioning.
What is the price of a 5kW solar system in Pakistan 2026?
A complete 5kW hybrid solar system costs Rs. 600,000–750,000 installed (without battery, March 2026). With a 5kWh lithium battery: Rs. 850,000–1,000,000. This is Pakistan’s most popular solar system, suitable for average homes running 1 inverter AC (1.5 ton), refrigerator, washing machine, fans, and lighting. Monthly electricity bill savings of Rs. 15,000–25,000 depending on usage, with ROI typically in 2.5–3 years.
What is the price of an 8kW solar system in Pakistan 2026?
A complete 8kW hybrid solar system costs Rs. 900,000–1,150,000 installed (without battery). Top inverter choices include Solis 8kW (Rs. 325,000–340,000), GoodWe 8kW IP65 (Rs. 315,000), and Inverex Nitrox 8kW (Rs. 265,000). This system powers 2–3 inverter ACs plus full household load, generating 35–42 kWh per day in Lahore. Best for 8–12 marla homes with heavy AC usage.
How many peak sun hours does Pakistan get for solar calculations?
Pakistan averages 4.5–6.5 peak sun hours per day depending on location and season. For safe system design, use 5–5.5 hours in Lahore, Islamabad, and Faisalabad; 5.5–6 hours in Karachi and Multan; 6–6.5 hours in Quetta and Dera Ghazi Khan. Always apply an 80% efficiency factor (0.80) to account for real-world losses from heat, dust, wiring resistance, and inverter conversion.
What is the solar panel price per watt in Pakistan March 2026?
March 2026 verified A-Grade Tier-1 panel prices: Longi HiMo7 610W at Rs. 34.50/W, Jinko N-Type bifacial at Rs. 28.5–34.50/W, JA Solar N-Type at Rs. 28–30/W, Trina N-Type at Rs. 28–33/W, Canadian TopCon at Rs. 32–36.50/W. General range for quality Tier-1 panels: Rs. 28–36.50 per watt. Prices are at historic lows due to global panel oversupply and have been stable through early 2026.
Should I buy a hybrid or on-grid solar system in Pakistan?
For most Pakistani homes and businesses, a hybrid solar system is the better choice in 2026. Load shedding continues across Pakistan — an on-grid system (without battery) shuts down completely during outages, which defeats the purpose for residential users. A hybrid system costs 30–40% more than an equivalent on-grid setup, but provides both backup security and bill savings. For purely commercial properties with very stable grid supply and high daytime loads only, an on-grid system with net metering may give a faster ROI.
Explore Our Complete Solar Range
Solar Panels in Pakistan
Tier-1 A-Grade panels from Longi, Jinko, JA, Trina, Canadian Solar. N-Type bifacial models from Rs. 28/watt. 25-year performance warranties.
Hybrid Inverters Pakistan
Solis, GoodWe, Crown, Inverex, Growatt hybrid inverters from 3kW to 50kW. Net metering ready. Wi-Fi monitoring. All brands in stock.
Lithium Batteries
Crown CMLB LiFePO4 batteries from 5.12kWh to 11.7kWh. 6,000+ cycle life. BMS included. 15+ year lifespan. Best backup for load shedding.
Dry Batteries Pakistan
Budget-friendly dry and tubular batteries for hybrid and UPS applications. Good option for lower-budget systems where lithium cost is a concern.
Solis On-Grid Inverters
High-efficiency Solis on-grid inverters for net metering systems. Single and three-phase, 3kW to 50kW. Ideal for daytime-heavy commercial loads.
Solar Tubewell Systems
Solar water pump solutions for agriculture. VFD pump controllers, submersible pumps, and complete DC tubewell packages for farms and remote locations.
Get Your Free Load Calculation — Lahore & Punjab
Share your electricity bill or appliance list. Our team will calculate your exact solar requirement, recommend the right system, and provide a confirmed quote — completely free, no obligation.