What could your commercial roof generate?
A free commercial solar calculator for Australian business sites. Enter the address for an indicative first look — usable roof area, system size in kW, estimated annual generation and a rough dollar value. No signup, no bill upload.
What this assessment does
A first check before detailed design.
Site Snapshot uses the address and available mapping data to estimate usable roof area, an indicative solar system size, annual generation and a rough dollar value. It is intended for warehouses, workshops, retail sites, manufacturing buildings and other commercial premises with meaningful daytime electricity use.
The result depends on the mapped roof, solar exposure and standard modelling assumptions. It does not use your interval load, electricity tariff, roof condition, switchboard capacity or network connection limits. Treat it as a screening result, not a quote, design or financial forecast.
A useful next review combines the snapshot with the site's network tariff, considers whether a battery has an evidenced job, and checks current project support before detailed modelling.
Common questions
Commercial solar, in short.
How much solar can a commercial roof hold?
As a first pass, every 100 m² of clear commercial roof supports roughly 15–20 kW of solar with modern panels — before allowing for access paths, skylights, plant and shading. The snapshot maps the actual roof outline and applies conservative coverage and derate factors rather than assuming the whole roof is usable.
How accurate is an indicative snapshot?
It is a screening result, not a quote. Roof area comes from mapped building outlines and generation uses PVGIS climate data, but the estimate does not include interval load data, the site tariff, roof condition, switchboard capacity or network export limits. Those are checked before any credible proposal.
What size system does a warehouse or workshop need?
The useful size is set by daytime electricity demand, not by roof area alone. A large roof can hold more solar than the site can use, and exported energy earns far less than energy used on site. The snapshot shows what the roof can hold; matching that to the load is the next step.
Is there a rebate for commercial solar in Australia?
Yes. Systems up to 100 kW receive an upfront discount through Small-scale Technology Certificates (STCs); larger systems can earn Large-scale Generation Certificates (LGCs) over time. NSW businesses adding a battery may also qualify for the PDRS incentive from September 2026. The incentives guide covers current settings.
How much does commercial solar cost per kW?
Indicative installed pricing for straightforward commercial rooftop systems is commonly modelled around $1,200–$1,500 per kW before incentives, with access, switchboard and connection work moving the real figure either way. The snapshot uses a conservative default and shows the assumption alongside the result.