Free, no-sign-up inverter battery calculator for India: backup time with per-appliance duty cycles, inverter VA and battery Ah sizing, start-up surge check, and a real-world efficiency audit you can run at home.
It answers three questions with real arithmetic: how long your inverter battery will last with a given appliance list, what inverter VA and battery Ah you should buy for a target backup time, and what your inverter's real-world efficiency actually is. It is free, needs no sign-up and sells nothing.
Yes. There is no account, no paywall and no product placement. It is built by Flocci Technologies, an India-first software studio, and shares one Flocci identity with 30+ other apps.
As accurate as your inputs. With nameplate wattages and the default 70% efficiency it is a solid estimate; with a measured efficiency factor and honest minutes-per-hour figures it typically lands within about 10% of observed runtime.
Not natively yet. The engine currently applies lead-acid tubular assumptions: 12V nominal and 50% depth of discharge. A chemistry toggle is on the roadmap; until then, raise the efficiency input to approximate a lithium pack.
Yes. Every input is encoded in the URL, so copying the address bar sends your exact setup — appliances, battery, efficiency and results — to an electrician, a dealer or a family group.
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.