What size inverter do I need for my home?

For a typical Indian home running 3 fans, 5 LED lights, 1 TV, and 1 WiFi router, you need a 900VA inverter with a 150Ah battery for 4 hours backup.

How to calculate inverter battery size?

Add up the wattage of all appliances you want to run, divide by inverter efficiency (0.8), that gives VA rating. For battery: (Total watts × backup hours) / (battery voltage × efficiency) = Ah needed.

Inverter & Battery Calculator — What Size Do You Need?

Select your appliances and backup hours — get exact inverter VA and battery Ah recommendation instantly.

Select Your Appliances

💡 LED Lights (9W)

🌀 Ceiling Fans (75W)

📺 TV (80W)

📶 WiFi Router (15W)

💻 Laptop (65W)

🧊 Fridge (150W)

❄️ AC (1.5 Ton) (1500W)

🔌 Other (Watts)

⏱️ Backup Hours Needed

📋 Your Recommendation

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Total Load (Watts)

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Inverter Size (VA)

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Battery (Ah)

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Batteries Needed

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How to Calculate Inverter Size

Step 1: Add up the wattage of all appliances you want to run during a power cut.

Step 2: Divide by 0.8 (inverter efficiency) to get the minimum VA rating.

Step 3: For battery: (Total Watts × Backup Hours) ÷ (12V × 0.7 efficiency) = Ah needed.

Common Inverter Sizes for Indian Homes

Home Type	Inverter	Battery	Price Range
1 BHK (basic)	600-800 VA	100 Ah	₹8,000-12,000
2 BHK (standard)	900-1100 VA	150 Ah	₹12,000-18,000
3 BHK (full load)	1500-2000 VA	200 Ah	₹18,000-30,000
With AC	3000-5000 VA	200Ah × 2	₹40,000-80,000

Tips to Maximize Battery Life

Keep battery in ventilated area (not enclosed cabinet)
Check water levels monthly (for lead-acid batteries)
Don't let battery discharge below 50%
Use power-saving appliances (LED, BEE 5-star fans)
Consider lithium batteries for longer lifespan (3x cost but 5x life)

FAQs

Can I run AC on an inverter?

Yes, but you need a minimum 3 KVA inverter and 2 × 200Ah batteries. Cost: ₹40,000+. Only recommended if you have frequent 4+ hour cuts.

Tubular vs Flat Plate battery?

Tubular batteries last 4-5 years and handle deep discharges better. Flat plate last 2-3 years but are cheaper. For frequent power cuts, always choose tubular.

🔋 Inverter & Battery Size Calculator