How to Read a Solar Quote

Getting a solar quote can be overwhelming — it's full of technical specs, brand names, and dollar amounts that might not mean much at first glance. Here's how to break it down.

System size and panel count

The system size (measured in kilowatts, or kW) determines how much electricity you'll generate. A 6.6kW system is the most popular in Australia. Check how many panels are included and what brand they are — more panels of a lower wattage can equal the same system size as fewer high-wattage panels.

Panel brand and tier

Panels are broadly categorised as Tier 1 or Tier 2. Tier 1 panels (like REC, Q CELLS, Jinko Solar) come from manufacturers with a proven track record and bankable warranty. This doesn't necessarily mean they're "better" — it means they're lower risk.

Inverter type

The inverter converts DC power from your panels to AC power your home uses. String inverters (Fronius, Sungrow) are common and cost-effective. Microinverters (Enphase) cost more but optimise each panel individually — better for shaded roofs.

STCs — the hidden discount

Your quote should mention Small-scale Technology Certificates (STCs). These are a federal government incentive worth $1,500–$3,000+ depending on system size and location. Most installers claim these on your behalf in exchange for a discount. They are legally required to disclose this. If your quote doesn't mention STCs, ask directly.

Warranty terms

Look for two separate warranties: product warranty (covers manufacturing defects, typically 12–25 years for panels) and performance warranty (guarantees output over time, usually 25 years with degradation). For inverters, look for at least 10 years.

What should be included

A complete quote should include: panels, inverter, mounting system, all electrical work, meter reconfiguration, council approvals (if needed), scaffolding, and the STC discount. If any of these are listed as extras, ask why.

Questions to ask before signing

1. What is the STC value for my system and how is it reflected in the price?
2. Is scaffolding included if my roof requires it?
3. Will I need a meter upgrade or switchboard work? Is that included?
4. What happens if there's a problem after installation — who do I call?
5. Can I see your CEC accreditation number?