Choosing the Right Commercial Solar System on the Central Coast: 30kW vs 100kW vs 250kW

Looking to reduce your energy bills with solar power for your Central Coast business? Whether you run a small office in Gosford or a manufacturing site in Somersby, choosing the right system size — 30kW, 100kW, or 250kW — is key to getting value from commercial solar.

In this guide, we break down the real-world differences in cost, output, and ideal use cases to help you make the right call.

Not every business needs a massive system — but going too small can limit your savings. The right commercial solar system should match your daytime energy consumption, roof space, and future plans.

Best for:

• Small businesses
• Workshops or trades
• Medical clinics or cafes
• Offices with low daytime usage

Estimated Cost (ex-GST):

$25,000 – $40,000

Key Points:

• Generates approx. 110–130 kWh per day
• Eligible for STC rebates (Small-scale Technology Certificates)
• Compact system with lower upfront cost
• ROI in ~3 years for businesses with $1,500+ monthly power bills

Best for:

• Warehouses
• Aged care centres
• Large retail operations
• Commercial kitchens or cold storage

Estimated Cost (ex-GST):

$70,000 – $120,000

Key Points:

• Generates around 400 kWh per day
• Still eligible for STC rebate (under 100kW threshold)
• Strong return for medium-to-large power users
• Common benchmark for businesses wanting serious energy bill reductions

Best for:

• Large factories and logistics hubs
• Agribusiness operations
• Multi-site or energy-intensive buildings
• Manufacturers with 24/7 operations

Estimated Cost (ex-GST):

$180,000+

Key Points:

• Generates 1,000+ kWh per day
• Ineligible for STCs (must claim LGCs under the Large-Scale Renewable Energy Target)
• Requires grid application and metering upgrades
• Strongest ROI for high-load users paying peak commercial rates

When comparing system sizes, don’t just look at panel count. Think about:

• Your energy usage pattern – When and how much power you use
• Roof space and structural suitability – Flat metal roofs are easiest to work with
• Local energy tariffs and demand charges – We factor in your current bill to size your system properly
• Battery compatibility – Larger systems can pair with commercial battery storage to reduce demand charges

• Tradies, clinics, and offices often start with 30kW systems to reduce day-to-day overheads.
• Warehouses and schools go for 100kW systems, striking a balance between cost and coverage.
• Food manufacturers, logistics, and agri-operations tend to go straight for 250kW+ systems to handle their large loads.

No two businesses are the same. That’s why we offer site assessments, usage reviews, and tailored system design — all obligation-free.