Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Transformer Sizing Calculator

Determine the minimum transformer kVA rating needed for a given electrical load, accounting for demand factor, power factor, safety margin, and ambient temperature derating. Use this when specifying or replacing distribution transformers on new or existing electrical systems.

Total Connected Load (kVA)

Demand Factor

Safety Factor

Load Power Factor

Ambient Temperature (°C)

Fill in the required fields to see your result.

Electrical

Battery Bank Sizing Calculator

Calculate the total battery bank capacity in amp-hours (Ah) needed for off-grid solar systems or backup power, factoring in autonomy, depth of discharge, and system efficiency losses. Use this when designing or expanding a battery-based energy storage system.

Daily Energy Consumption (Wh)

Days of Backup Required (days)

System Voltage

Depth of Discharge

System Efficiency (%)

Fill in the required fields to see your result.

Key differences

	Transformer Sizing Calculator	Battery Bank Sizing Calculator
Category	Electrical	Electrical
Inputs required	5	5
Result	Required Transformer Size (kVA)	Required Battery Capacity (Ah)
What it does	Determine the minimum transformer kVA rating needed for a given electrical load, accounting for demand factor, power factor, safety margin, and ambient temperature derating. Use this when specifying or replacing distribution transformers on new or existing electrical systems.	Calculate the total battery bank capacity in amp-hours (Ah) needed for off-grid solar systems or backup power, factoring in autonomy, depth of discharge, and system efficiency losses. Use this when designing or expanding a battery-based energy storage system.