20kWh vs 50kWh vs 100kWh Commercial Battery: What Size Does Your Business Need?



The right commercial battery storage size depends on your electricity use, solar generation, operating hours and energy goals. A 20kWh battery may suit a smaller business, while a 50kWh or 100kWh system may better suit businesses with higher energy demand.

However, there is no universal battery size for every business.

Two businesses can consume a similar amount of electricity but need very different batteries. Their operating hours, solar generation, peak demand and electricity tariffs may differ.

That is why choosing the largest battery available is rarely the best approach.

Instead, your commercial battery should store enough energy to meet a useful part of your demand. It should also charge regularly and discharge when the stored energy provides the most value.

For businesses considering a commercial solar battery, this guide compares 20kWh, 50kWh and 100kWh systems. It also explains how installers determine the right capacity for a commercial solar battery installation.

What Is Commercial Battery Storage?

A commercial battery storage system stores electricity for use at a later time.

Businesses can charge batteries from suitable excess solar generation. Depending on the system and electricity arrangement, charging from the grid may also be possible.

When the business needs electricity later, the battery can discharge stored energy.

This creates a simple energy flow:

Solar panels → Business loads → Excess solar → Battery → Later business loads

For example, a business may produce substantial solar energy at midday. However, its electricity demand may continue after the sun goes down.

A commercial solar battery can store suitable surplus generation during the day. The business can then use that stored energy later.

Battery storage can also support peak demand management and selected backup loads. However, these functions depend on the battery, inverter, controls and site design.

The NSW Government’s new business battery incentive also recognises these benefits. Eligible businesses can receive an upfront discount from 1 September 2026, with indicative discounts of about 20% to 30% for battery-only installations. Eligible solar and battery installations can receive about 30% to 40%.

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