Inverter Battery Charging Time & Unit Cost Calculator
Find out how many hours it takes to fully charge your inverter battery after a power cut, and the exact electricity bill cost (kWh units consumed) based on charging current and grid tariff.
To charge from 80% discharge using 14A current.
Safe charging current is typically 10% of battery Ah. For a 150Ah battery, set your inverter charger switch to 12A-15A to avoid boiling the electrolyte.
How This Calculation Works & Technical Formula
How to use this tool:
- Enter battery capacity in Ah (e.g. 150Ah).
- Enter inverter charging current in Amperes (typically 10A to 15A for 150Ah).
- Set initial discharge level (e.g. 80% discharged).
- Enter your local electricity rate per unit (e.g. ₹7/unit) to view full charge cost.
Frequently Asked Questions
How many electricity units are consumed to charge a 150Ah battery?+
A standard 12V 150Ah battery has a nominal capacity of 1.8 kWh. Accounting for charging losses (~20-25%), a full charge consumes approximately 2.1 to 2.3 units (kWh) of electricity, costing about ₹15 to ₹18 at average Indian tariffs.
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