Batteries & Backup

Capacity, runtime and charge time for battery banks and UPS systems.

• Battery Capacity Calculator The amp-hours and watt-hours a battery bank needs to run a given load for a given time, allowing for depth of discharge and inverter losses.
• Battery Charge Time Calculator How long a battery takes to charge from a given state of charge, at a given charger current.
• Battery Runtime Calculator How long a battery will run a load, accounting for usable depth of discharge and inverter efficiency.
• UPS Runtime and Sizing Calculator How long a UPS will hold up a load, and the VA rating and battery capacity needed for a target runtime.
• Watt-Hours to Amp-Hours Calculator Convert between watt-hours and amp-hours at a given battery voltage — the conversion every battery spec sheet assumes you can do.