Find out exactly what size solar system your home or business needs. Enter your appliances (or pick your plot size), and get your recommended kW system, battery backup, estimated cost in PKR, and monthly savings β with a downloadable report. Built for Pakistan's homes, shops, and farms.
For your report (not stored anywhere)
Pick a size to pre-fill a typical load
Qty Β· Watts (editable) Β· Hours/day
Choose type and backup
Indicative bill of materials
A solar load assessment works out how much electricity your home or business actually uses, and from that, the right size of solar system to install. Oversize it and you waste money; undersize it and you keep paying heavy electricity bills. Getting the size right is the single most important step before buying solar.
This calculator does it in three steps: it adds up your connected load (the total wattage of all your appliances), estimates your daily energy use in units (kWh) based on how many hours each appliance runs, and then recommends a solar system size in kW β along with battery backup, an estimated cost in PKR, and your expected monthly savings.
Your solar system is sized mainly from your daily units, not just the connected load β because what matters is the energy you consume over a day, not the instant a few appliances switch on together. This calculator uses the following guide:
| Daily Use (Units/kWh) | Recommended System | Typical Suits |
|---|---|---|
| 0 β 10 units | 3 kW | Small home, 3β5 Marla, basic load |
| 10 β 20 units | 5 kW | 5β7 Marla home with 1 AC |
| 20 β 35 units | 8 kW | 7β10 Marla, 2 ACs |
| 35 β 50 units | 10 kW | 10 Marla, multiple ACs |
| 50 β 70 units | 15 kW | 1 Kanal house / small shop |
| 70 β 100 units | 20 kW | Large home / commercial |
| 100+ units | Custom design | Industrial / heavy commercial |
The number of panels is then worked out by dividing the system size by the panel wattage. For example, a 5 kW system using 550-watt panels needs about ten panels.
| Type | Battery | Best For |
|---|---|---|
| On-Grid | No battery | Lowest cost; uses net metering to sell surplus to the grid and offset bills. No backup during load-shedding. |
| Hybrid | With battery | Most popular in Pakistan β runs on solar, stores backup for load-shedding, and can still use the grid. Higher cost. |
| Off-Grid | Large battery | No grid connection at all (remote farms, tube wells). Needs the biggest battery bank, so it is the most expensive. |
Net metering lets an on-grid solar system export surplus daytime electricity to the grid, which is credited against the units you draw at night β effectively running your meter backwards. It is the main reason on-grid solar pays back quickly on a high bill.
Your actual savings depend on your electricity tariff (which rises with usage slabs), how much of your generation you use versus export, and your provider's current net-metering terms. Because tariffs, equipment prices, and net-metering policy change regularly, treat the cost and savings figures here as planning estimates.
