Battery Backup Calculator

Calculate optimal battery configuration for your power backup needs

Input Parameters

Load
? Where to find KVA/KW value:
This is typically listed on the equipment nameplate.

Conversion Formulas:
KW = Watts/1000
KVA = VA/1000
Power Factor (PF)
Inverter Efficiency (EFF)
? Where to find EF value:
This is typically listed in UPS/inverter specifications.

Standard values:
Single Phase Inverter: 85%
Three Phase Inverter: 90%

Where to find PF value:
This may be listed on equipment nameplates or specifications.

Standard values:
Single Phase Load: 0.8
Three Phase Load: 0.95
12V Batteries/String
Max Strings
? MaxStrings:
Mention the number of battery strings you want in the battery calculation.

What is a Battery String?
A battery string is a set of batteries connected in series to achieve the required voltage.

Where to find this value:
Check your UPS/inverter manual or specifications.
Min - Max Battery (Ah)
? Minimum and maximum battery capacity in Amp-hours (Ah) to consider in the calculation.
Backup Time (Minutes)
? Standard backup times:
- 15 minutes: Basic computer backup
- 30 minutes: Modern computer/office equipment
- 60 minutes: Critical servers
- 120 minutes: Sump pumps, medical equipment
- 240 minutes: Whole house backup

Calculation Results

←
Fill the parameters
Press "Calculate Battery Size" Button
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