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Determine peak load in watts (TV, fridge, lights, fans). A 1500VA inverter handles ~1200W continuous. 2kVA for medium homes, 3kVA for larger setups. Add 30% buffer for safety.
Pure Sine Wave: Best for sensitive electronics (ACs, refrigerators). Modified Sine Wave: Budget option, may cause noise/interference with some devices. Avoid for expensive appliances.
Check volt/Ah specifications of your battery. Microtek, V-Guard, Luminous are top brands with 2-5 year warranty. Ensure proper ventilation and earthing installation.
Look for minimum 2-year warranty. Service center proximity matters. Compare prices during off-season (May-June) for 10-15% discounts. Read reviews for reliability.