Battery bank size calculator
Use our battery bank size calculator to calculate accurate size and measurement values instantly.
Calculator
Estimate battery bank capacity from load, backup time, and system voltage.
Formula: Ah = (load W x backup h) / (voltage x efficiency x DOD)
What each field means
- Load (W): Enter a valid value for this field.
- Backup Time (h): Enter a valid value for this field.
- System Voltage (V): Example: 12
- Inverter Efficiency (%): Example: 90
- Usable Depth of Discharge (%): Example: 80
Estimated Battery Capacity (Ah)
Your result will appear here.
About Battery bank size calculator
The Battery bank size calculator helps you estimate cable and electrical values quickly using consistent assumptions and practical calculation rules.
Formula Explanation
Ah = (load W x backup h) / (voltage x efficiency x DOD)
Inputs You Need
- Required measurement values relevant to this calculator
- Unit selection: Load (W), Backup Time (h), System Voltage (V), Inverter Efficiency (%)
- Optional tolerance, safety, or scenario values if applicable
Step-by-Step Usage
- Enter your known values in the calculator fields.
- Select units and options that match your scenario.
- Click Calculate to generate your output.
- Copy, save, or share the result for later reference.
Example
Run the tool with realistic values from your use case and compare the output against expected ranges for cable and electrical calculations.
Method Sources
Frequently Asked Questions
Is this Battery bank size calculator accurate?
Yes, when correct inputs and units are provided.
Which units does this calculator support?
This tool is optimized for Load (W), Backup Time (h), System Voltage (V), Inverter Efficiency (%).
Can I use this calculator on mobile?
Yes, the form is optimized for touch inputs and smaller screens.