Off-Grid Solar Battery Sizing Calculator | Free Online Tool

How Off-Grid Solar Battery Sizing Calculator works

Off-Grid Solar Battery Sizing Calculator calculates required capacity from the supplied parameters, with live validation, a readable formula note, and local browser processing.

Calculation model

Sizes battery amp-hours from daily load, autonomy, voltage, DoD, and efficiency.

Recommended workflow

Confirm every field uses the displayed unit.
Adjust the example values and review the live result and input summary.
Copy the result, then document assumptions and verify requirements before use.

Use cases

Use it for planning, comparison, documentation, and quick checks involving daily consumption, autonomy, battery voltage, usable depth of discharge, system efficiency.

Limits and verification

The calculation follows this stated model: Sizes battery amp-hours from daily load, autonomy, voltage, DoD, and efficiency. Real projects may require additional coefficients, tolerances, taxes, codes, or professional review.

Frequently Asked Questions

Does Off-Grid Solar Battery Sizing Calculator upload my values?

No. The calculation runs in the current browser tab and ToolHub does not receive or store the values you enter.

What does Off-Grid Solar Battery Sizing Calculator calculate?

Required capacity from daily consumption, autonomy, battery voltage, usable depth of discharge, system efficiency.

Can I use the result in a real project?

Does it work on phones?

Yes. The input and result workspace adapts to mobile, tablet, and desktop screens.

Why can my result differ from another source?

Differences usually come from units, rounding, assumptions, local rules, or coefficients used by the other source.

Off-Grid Solar Battery Sizing Calculator: inputs, output, and reproducible example

Off-Grid Solar Battery Sizing Calculator calculates required capacity from the supplied parameters, with live validation, a readable formula note, and local browser processing.

What this page actually processes

Field	Control	Default example	Validation role
Daily consumption	Number	`2000`	Daily consumption is read by the browser as a number value before the tool runs.
Autonomy	Number	`2`	Autonomy is read by the browser as a number value before the tool runs.
Battery voltage	Number	`24`	Battery voltage is read by the browser as a number value before the tool runs.
Usable depth of discharge	Number	`80`	Usable depth of discharge is read by the browser as a number value before the tool runs.
System efficiency	Number	`90`	System efficiency is read by the browser as a number value before the tool runs.

Reproduce the built-in example

Start with Daily consumption = 2000; Autonomy = 2; Battery voltage = 24; Usable depth of discharge = 80; System efficiency = 90, then run Off-Grid Solar Battery Sizing Calculator. Change one input at a time so the effect on the result remains traceable.

After validating daily consumption, autonomy, battery voltage, usable depth of discharge, system efficiency, the page displays its result in the output workspace and enables the relevant copy or download action.

Formula and variable relationship

Sizes battery amp-hours from daily load, autonomy, voltage, DoD, and efficiency. The implemented expression is “daily*days/(voltage*(dod/100)*(efficiency/100))”. The page validates daily consumption, autonomy, battery voltage, usable depth of discharge, system efficiency before formatting the result in Ah.

Sensitivity check: change only daily consumption from 2000 Wh to 2,200 Wh. With every other input unchanged, required capacity moves from 231.48 to 254.63 Ah. This provides a reproducible input-to-result check.

When to use it and how to interpret the result

Off-Grid Solar Battery Sizing Calculator is intended for workflows involving Daily consumption, Autonomy, Battery voltage, Usable depth of discharge, System efficiency.

Limits and checks before use

Sizes battery amp-hours from daily load, autonomy, voltage, DoD, and efficiency.

Page verification record

Controls inspected5 documented inputsResult pathValidate → process → review → copy/downloadLast content review2026-09-02