Battery Charging Time Calculator

Estimate how long it takes to charge your inverter, UPS, or solar battery.

Input Parameters

Enter battery and charger details

Charging Time

Estimated Charge Time
6h 15m
(6.25 hours)
Ah to Recharge75.0 Ah
Recommended Rate (C/10)15.0 A
Fast Rate (C/5)30.0 A
Trickle Rate (C/20)7.5 A

Quick Guide

  • C/10 rate (recommended) = Battery Ah ÷ 10
  • Lead-acid batteries need ~80% charging efficiency factor
  • Lithium batteries are ~95% efficient while charging
  • Never fast-charge a lead-acid battery above C/5 rate
  • Most Indian inverters charge at 10–15A by default