Home Inverter (kVA) & Battery Capacity (Ah) Calculator
Select your essential outage appliances and desired backup duration to calculate your exact inverter VA capacity and battery Ah requirement.
Appliance Power Outage Load Configuration
Keeps food cold during extended blackouts.
Requires minimum 2.5 kVA / 24V inverter.
Typical power cuts in India range between 2 and 4 hours.
0.8 kVA Pure Sine Wave Inverter + 1 × 150 Ah Battery
Guarantees a true 4 hours of uninterrupted backup for your 527W load without tripping or dangerous voltage sag. Pure Sine Wave protects sensitive laptop and fridge motherboards.
Frequently Asked Questions
Q:How do I calculate inverter VA capacity from total appliance Watts?
Inverters are rated in Volt-Amperes (VA), whereas appliances are rated in Watts. To convert Watts to VA, divide total wattage by the power factor (typically 0.8) and add a 20% to 25% safety surge headroom: Inverter VA = (Total Watts / 0.8) × 1.25. For example, a 500W load needs a (500 / 0.8) × 1.25 = ~780 VA (or standard 900VA / 1 kVA) inverter.
Q:What is the difference between Tubular Lead-Acid and Lithium batteries for home inverters?
Tubular lead-acid batteries have a 70%–75% usable Depth of Discharge (DoD), take 10–12 hours to charge, require distilled water top-ups, and last 4–5 years. Lithium (LiFePO4) batteries support 90% DoD, charge in 2–3 hours, are maintenance-free, and last 10+ years, though they carry a higher upfront purchase cost.
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