The best battery backup for home appliances depends on needs. For whole-home coverage, consider a 10,000–20,000 Wh capacity system with a pure sine wave inverter (e.g., Generac PWRcell, Tesla Powerwall). For portable options, EcoFlow Delta Pro (3,600W output, 3,500+ cycles) suits mid-sized appliances. Prioritize lithium-ion batteries for longer lifespan and check compatibility with your appliance wattage and surge requirements.