A ceiling fan draws about 70W, a 9W LED bulb 9W, a 190L refrigerator about 150W and a 0.5HP water pump 400W. On a 150Ah 12V battery holding 630Wh usable, that is roughly 9 hours for one fan and 4 hours 12 minutes for the fridge alone. Each appliance page shows runtime across every battery size plus its start-up surge.
Wattages here are typical Indian retail units. Every page shows runtime across the whole battery range, how many units one battery carries, the effect of duty cycle, and the start-up surge multiplier that decides whether your inverter trips.
About 70W for a standard 1200mm induction-motor fan at medium-to-high speed, and about 30W for a BLDC fan of similar airflow. That difference is the highest-leverage change available to most Indian homes.
In this catalogue, a mixer grinder (500W) and a 0.5HP water pump (400W) draw hardest, though both run in short bursts. An air cooler at 180W run continuously usually costs the most energy over an evening.
The factor by which a motor exceeds its running wattage at switch-on — 3.5x for compressors, 3x for fridges and pumps, 1.5x for fans and 1.1-1.2x for electronics. It determines whether an inverter trips, independent of runtime.
Measured, if you have a meter. Nameplate ratings are often maximum-draw figures. Where you have no meter, use these typical values and treat the result as an estimate.
Battery Buddy is free, needs no sign-up, sells no batteries and shows every formula it uses. It is built by Flocci Technologies, an India-first AI-native software studio behind 30+ apps that share one Flocci identity.