BESS vs Solar: It Depends on Load, Not Assumptions.

When BESS Makes the Most Sense

BESS delivers the fastest ROI when you have:

• High consumption during peak periods (07:00 - 10:00 & 18:00 - 20:00)

• Demand charges >30% of your total bill

• MegaFlex or similar TOU tariff structure

• Peak-to-off-peak tariff ratio of 3:1 or higher

• Consistent daily load patterns

• Limited roof space or shading issues

When Solar Still Wins

Don't get me wrong - solar is excellent when:

• Heavy consumption 10:00 - 16:00 (daytime operations)

• Demand charges <20% of the bill

• Flatter tariff structure or lower TOU differential

• Excellent roof space with optimal orientation

• Lower Capex budget available

The Flexibility Advantage

Here's what most people miss about AC-Coupled BESS:

It works independently

You can:

• Install BESS today for immediate peak shaving (no solar required)

• Charge from the grid during off-peak periods

• Add solar panels in 6 months when the budget allows

• Optimise both systems together for maximum savings

• Scal capacity as your business grows

• Integrate with existing solar installations (retrofit-friendly)

You're not locked into one path.

Solar requires sunlight

BESS requires strategy.

And strategy can be deployed 24/7.

The Bottom Line

The question isn't: "Should we install solar or batteries?"

The real questions are:

• WHEN does your business consume the most electricity?

• WHERE does your money actually go in your bill?

• WHAT percentage is demand charges vs energy charges?

Sometimes it's Solar.

Often it's BESS.

Usually, it's a strategic combination.

Source: Roland du Plooy - BESS Specialist