This is the question we hear most: "Mujhe kitne kVA ka stabilizer chahiye?" The shopkeeper usually guesses. Here is how to get it right in two minutes.
Quick answer by home size
- 1 AC + fridge + lights (5 marla): 5 kVA
- 2 ACs + fridge + electronics (10 marla): 10 kVA
- Whole house — geyser, motors, several ACs: 15 kVA
- Just a TV, router and lights: 1–2 kVA is plenty
How to size it yourself
Add up the load of everything the stabilizer will run, then add 25% as a safety margin. Rough numbers for Pakistani homes:
- 1.5-ton AC ≈ 1,800 VA
- Refrigerator ≈ 400 VA
- Each fan or LED light ≈ 100 VA
Two 1.5-ton ACs (3,600) + fridge (400) + 6 fans/lights (600) = 4,600 VA. Add 25% = 5,750 VA. So a 10 kVA unit is comfortable, a 5 kVA is too tight.
Don't forget the startup surge
An AC or fridge compressor pulls 2–3 times its normal load for the first 2–3 seconds when it starts. This is why we add the safety margin — a stabilizer sized exactly to the running load will struggle every time the AC kicks in.
The spec everyone forgets: input range
In most areas of Lahore, Karachi and smaller cities, evening voltage drops below 150V. A stabilizer that only works above 170V will simply switch off when you need it most. Always check the lower limit — ours hold a steady 220V from as low as 90–140V.
Which type for your home?
For a normal home, a servo (SVC) stabilizer is the dependable choice. For sensitive or expensive equipment — inverter ACs, medical gear, computers, laser or CNC machines — go with the inverter (IGBT) type for tighter ±2% accuracy and instant correction.
