Power answers for Pakistan.

For a single 1 to 1.5-ton AC plus a fridge and lights, a 5kVA servo (SVC) stabilizer with a 140V input range is ideal. For two ACs choose 10kVA, and for whole-home protection choose 15kVA.

Relay (AVR) stabilizers switch voltage in fixed steps, which stresses AC compressors. Servo (SVC) stabilizers move a motor-driven slider for smooth, continuous correction within ±1% — better for motors and electronics.

Look for a lower limit of 140V or below. Many areas of Lahore and Karachi drop under 150V in peak evening hours, so a stabilizer that only works above 170V will simply shut off when you need it most.

Lithium (LFP) is better for daily load-shedding in Pakistan's heat. It lasts 10–15 years versus 2–3 for lead-acid, gives more usable energy, charges faster, and holds about 90% capacity at 45°C where lead-acid drops by half.

Multiply your load in watts by the hours of backup you want. Essentials (fans, lights, fridge, TV) draw about 300W, so a 5 kWh bank covers 6–8 hours; add an inverter AC and a 10 kWh bank covers a full home for 6+ hours.

Yes for most homes. Lead-acid is cheaper to buy but often needs replacing every 12–18 months in the heat. A good LFP bank pays for itself in 3–4 years and then runs for another decade.

Use LFP (lithium iron phosphate) cells from a real manufacturer like EVE, with a scannable factory QR code. LFP is the safest lithium chemistry and stays stable in Pakistan's heat — avoid unbranded grade-B market cells.

For a single 1 to 1.5-ton inverter AC plus a fridge and lights, a 5 kVA stabilizer is right. For two ACs choose 10 kVA, and for a whole house with geyser and motors choose 15 kVA.