A wrong-sized inverter is one of the most common solar mistakes in Pakistan. Too small and it trips when the AC and pump start together; too big and you waste money. This calculator finds the right inverter size from the appliances you run at the same time.
Solar Inverter Size Calculator
Apne ghar ke liye sahi inverter size (kW) janein.
Adds 25% headroom over running load and checks motor starting surge. Always confirm continuous output (kW) on the spec sheet, not just kVA.
How to use this calculator
- Enter the ACs, fans and lights that may run at the same moment.
- Add other appliances that run together, such as a fridge, TV or washing machine.
- Select your water pump, if any. Motors need extra power to start.
- Choose whether you need backup during load shedding.
How inverter size is calculated
- Running load: everything that may be on at once. A 1.5-ton inverter AC is counted at about 1,300 W of steady running power.
- Surge load: motors briefly draw two to three times their rating when starting.
- Recommended size: 25% above your running load, checked against the surge, then rounded up to a standard inverter size.
Many inverters are sold as “6 kVA” or “6.2 kW” but deliver less continuous power. Check the rated continuous output in kW on the spec sheet before buying.
Common inverter sizes for Pakistani homes
| Home load | Typical inverter |
|---|---|
| Fans, lights, fridge, TV | 2 – 3 kW |
| Above + one 1.5-ton inverter AC | 4 – 5 kW |
| Above + two ACs or a 1 HP pump | 6 – 8 kW |
| Three or more ACs | 10 kW and above |
On-grid or hybrid?
Choose an on-grid inverter if outages are rare and you want the lowest cost. Choose a hybrid inverter if you face load shedding or want to store daytime solar for the evening, which matters more under the 2026 net billing rules. See prices in our 5kW inverter price guide.
Frequently asked questions
What size inverter do I need for a 1.5 ton AC?
A 1.5-ton inverter AC with fans and lights usually needs a 4–5 kW inverter. Add more if a pump or a second AC may run at the same time.
Can I connect more panels than my inverter size?
Usually yes. Most modern inverters accept about 20–30% more panel capacity than their rating. Check the maximum PV input on the spec sheet.
Is a bigger inverter always better?
No. An oversized inverter costs more and runs less efficiently at low load. Size it to your real running load plus a safety margin.
Prices and rules change often. This page was last reviewed on 12 November 2026. Spotted an outdated rate? Tell us and we'll update it.