How to Compare Three Solar Quotes: A Practical Guide for Erina Homeowners
The cheapest quote isn't usually the best deal. The most expensive quote often isn't worth the premium either. Most Erina homeowners getting solar quotes end up comparing prices that look apparently similar, three numbers between $7,500 and $10,500 for "a 6.6 kW system", without realising the underlying systems are quite different. This is a working guide to reading solar quotes well enough to compare like for like.
### Why solar quotes are hard to compare
Three reasons solar quotes are genuinely harder to compare than they look:
1. The total number bundles many decisions. Panel brand, panel wattage, inverter brand, mounting style, monitoring level, warranties, and labour are all rolled into one figure.
2. Quotes use different assumptions. One installer's quote might assume a clean tile roof install; another might include allowance for switchboard upgrades. Without flagging the differences, the apparent "saving" disappears once site complications emerge.
3. Discounts can mask real prices. "STC discount of $3,000" sounds significant but is the same rebate every installer offers. "Special $500 off this week" is sometimes legitimate, sometimes inflated pricing with a discount applied.
### The line items that matter
Print out (or photograph) all three quotes side by side. Compare these items specifically:
Panel brand and model. Not just "Tier 1 panels", the specific manufacturer (JinkoSolar, Trina, REC, LG, etc.) and model number. Wattage per panel (typically 400-450W in 2026 residential). Total system DC capacity (panels x wattage).
Inverter brand and model. Same as above, specific manufacturer and model, not a generic "premium inverter." Hybrid vs string vs microinverter type.
Number of panels. A "6.6 kW system" is around 15-17 panels at 2026 wattages. Some installers achieve the system size with fewer larger panels, some with more smaller ones. Same total capacity, different panel count.
Mounting and racking. Tin/Colorbond clamps vs tile-replacement flashings vs tilt frames. The hardware should match your roof type.
Inclusions and exclusions. Look for: - Switchboard upgrade if needed (some quotes include, some flag separately, some assume it's not needed and add it after install) - Bird mesh (often optional add-on) - Smart meter or consumption monitor (often optional add-on) - Monitoring set-up and app account creation - Final commissioning and grid connection paperwork
Warranties. Three warranties to check: - Panel warranty (typically 10-25 years product, 25-30 years performance) - Inverter warranty (typically 5-10 years standard, extended options available) - Installer workmanship warranty (varies widely, 1 to 10+ years)
The installer workmanship warranty matters most because it covers installation defects (leaks, loose mounting, wiring issues) that panel and inverter warranties don't.
Timeline. How long from acceptance to install. Some installers are weeks out; some are months. If solar deadlines or events matter to you, factor this in.
Payment terms. Deposit required, balance on completion, finance options if relevant.
### Red flags worth investigating
A few patterns that warrant a closer look:
Quotes significantly cheaper than the others without explanation. Why is this one $1,500 less? Sometimes it's a genuinely lean installer with low overheads. Sometimes it's missing line items that show up as cost extras later. Always ask.
Quotes that won't name specific brands or models. "Quality panels" or "Tier 1 inverter" without specifying which brand is a flag. Ask for the specific model. Some installers will quote one brand and substitute another at install if the quoted brand is out of stock, get this in writing.
Quotes with very short workmanship warranties. Anything under 5 years on installer workmanship is short. Quality installers offer 10+ years because they're confident in their work.
Pressure to sign quickly. "This price is only good until end of week" or "Sign today and we'll add $500 off." Legitimate businesses don't usually time-pressure quotes. The actual STC value and component pricing don't change weekly.
No site assessment offered. A quote based purely on a phone call and your address, without anyone visiting the roof, is a rough estimate at best. Site complications (roof type issues, shading, electrical capacity, access) need someone to physically check.
Vague language around grid connection. Connection to the grid (Endeavour Energy on most of the Central Coast) involves specific paperwork. A quote that says "we'll handle it" without specifying what's included can become a problem if extra work is needed.
Subcontracting that's not disclosed. Some sales companies sell solar but subcontract the actual install to whoever's available. The team on your roof might not be the team you spoke to. Ask: who does the actual installation? Are they SAA accredited under their own name?
### The questions every quote should answer
When comparing quotes, you should be able to answer these for each:
- Specific panel brand, model, and total DC capacity - Specific inverter brand and model - Specific number of panels and individual panel wattage - Estimated annual generation in kWh - Total upfront cost, including the STC discount - What's included for grid connection and paperwork - What's not included (switchboard, mesh, monitoring, etc.) and what it would cost to add - Workmanship warranty length - Who actually does the installation (the company you signed with, or subcontractors) - Timeline from acceptance to commissioning - Payment terms
If any of these can't be answered clearly, that's a sign to ask for clarification, or to choose a quote that's clearer.
### What's actually worth paying more for
Three areas where paying more often pays back:
Inverter quality. Premium European brands cost $1,000-2,000 more but consistently outlast budget brands. Over a 15-20 year system life, the premium pays for itself in avoided replacement costs.
Workmanship warranty length. A 10-year workmanship warranty costs the installer more to provide than a 5-year one. The longer warranty signals confidence in install quality.
Local installer presence. Installers based on the Central Coast or in nearby Sydney often have faster service response and stronger accountability than companies that fly teams in from interstate. The added cost (if any) is small for the service benefit.
### What's not worth paying more for
Three areas where the premium often doesn't earn back:
Premium panel brands at the high end. The difference between mid-tier and premium-tier panels is usually small in real-world performance. Both are CEC approved, both come with 25-year performance warranties, both produce similar annual output on similar roofs.
"Boutique" installers with high-end branding. Some companies charge significant premiums for boutique-style sales and project management. The actual install work and components are similar to a more standard installer.
Excessive monitoring add-ons. Most modern inverters include adequate monitoring as standard. Paying extra for "premium monitoring" is sometimes redundant.
### Frequently Asked Questions
#### Should I always get three quotes?
Three is a useful baseline, enough to spot outliers, not so many that comparison becomes overwhelming. Two quotes can work if both come from installers you trust. Single-quote installs are riskier because you have nothing to benchmark against.
#### Is a referral from a friend better than a cold quote?
Referrals from people whose systems are 3+ years old are particularly valuable, they've lived with the install long enough to know how the installer responded to warranty issues, monitoring concerns, and longer-term performance. Brand-new installs say little about workmanship over time.
#### What if the quotes are all from the same parent company?
Some solar sales companies operate multiple "brands" that share back-end installers. If three quotes seem suspiciously similar in language, pricing structure, or fine print, ask each who actually performs the installation. You may discover the apparent competition isn't real.
#### How long should I wait before deciding?
A few days is plenty to compare and decide. Anyone pressuring you to decide same-day is signalling more about their sales practices than the genuine value of the offer. STC rebates don't expire weekly, and component pricing doesn't shift meaningfully in the time it takes to make a considered decision.
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