Commercial solar installation in Mackay, 30 kW to 500 kW

Typical 100 kW commercial system on Ergon Large Business tariffs pays back in 3.8 to 5.2 years, depending on your daytime load profile. We model three scenarios (conservative / base / aggressive) against 12 months of your actual interval data so you see the range, not a single rosy number.

Yes. Any commercial system over 30 kW is treated as embedded generation and requires a formal connection application with Ergon Energy. Approval typically takes 30 to 60 business days. We lodge the application on day one of design so the network approval runs in parallel with procurement, not after.

For 2025-26 the temporary $20,000 instant asset write-off applies to small business (under $10M turnover). Most commercial solar projects exceed that threshold and depreciate over the asset life. Talk to your accountant about the small business energy incentive (bonus 20% deduction for energy-efficient assets), which often applies.

No, in 99% of cases. The DC roof work happens with no impact on your power. The final cutover to live (the changeover at the switchboard) takes 30 to 60 minutes; we schedule it for a Sunday or after-hours window so trading is not interrupted.

STCs (small-scale technology certificates) apply to systems under 100 kW and are claimed once upfront, discounting your install cost. LGCs (large-scale generation certificates) apply to systems over 100 kW and are earned over 15 years per MWh generated. We model both pathways and recommend the better option for your system size.

We send Brad on site to inspect the roof structure, purlin spacing and material before quoting hardware. If your roof needs strengthening or replacement first, we tell you upfront. We won't quote a system that compromises the building.

Yes. PPA (you pay only for the kWh generated, no upfront cost) is available for commercial systems over 100 kW with our finance partners. We also offer chattel mortgage and operating lease for capex-friendly structures. The 24-hour quote PDF shows all three options.

There is no honest per-kilowatt figure for commercial, and anyone who gives you one on a website is guessing at your site. What sets the price is the roof structure, the switchboard and cabling run, whether Ergon requires export limiting, and the mounting system your roof sheet needs. We quote 30 kW to 500 kW, we come out and look, and the number comes back within 24 hours as three costed scenarios rather than one figure.

The one sized against your interval data, not the biggest one that fits on the roof. A commercial system earns its money by covering load you are already using during the day, so the shape of your consumption matters more than the size of your roof: a business that runs hard from 7am to 5pm gets a very different answer from one that runs a night shift. We model three scenarios against 12 months of your actual AEMO interval data so you can see which one pays back, not just which one is biggest.

There is no Mackay-specific solar rebate. The rebate is federal and it is the same everywhere in Australia: the STC scheme, which comes off your quoted price as an up-front discount rather than something you claim back later. Mackay sits in STC zone 3, the same rating as Brisbane, so a system here earns the same certificates as the same system in the south east.