Solar Quotes Compared: What Is Included, Excluded and Assumed
Solar quotes are not easy to compare when they hide different assumptions. Two quotes can show the same system size and a similar price while including different equipment, different electrical work, different monitoring and different savings assumptions.
Before comparing the total price, compare what is actually being promised.
- Compare inclusions, exclusions and assumptions before comparing headline price.
- Savings estimates should show usage, export and tariff assumptions.
- Switchboard, metering, roof access and warranty details can change the real cost and risk.
The mistake to avoid
The mistake is treating the cheapest quote as the cheapest finished system. A low quote may be genuinely efficient. It may also be missing work that another quote includes.
The only way to know is to compare the scope.
Put the quotes side by side
Create a simple comparison table. Do not rely on the quote layout to make the important differences obvious.
| Quote item | Why it matters | Question to ask |
|---|---|---|
| Panels and inverter | Determines the core system | Are model numbers listed clearly? |
| Roof layout | Shows whether the design is site-specific | Which roof faces and panel positions are used? |
| Electrical work | Can change cost and safety | Is switchboard or metering work included? |
| Monitoring | Helps owners see performance | What app, portal or handover is included? |
| Savings estimate | Can hide optimistic assumptions | What self-use, export and tariff assumptions are used? |
| Warranties | Affects support later | Who handles product and workmanship claims? |
Exclusions deserve attention
Look for wording such as "subject to inspection", "standard installation", "metering not included" or "switchboard upgrade extra". These phrases are not automatically bad, but they need plain-English explanation.
Ask what would trigger an extra cost. A quote that is honest about exclusions can be better than one that looks neat but vague.
Assumptions can move the savings
Solar savings depend on daytime use, export value, tariff type, roof performance and household behaviour. If a quote gives a payback estimate, ask what it assumes about each of those points.
If two quotes use different assumptions, their savings figures are not directly comparable. The more useful quote is the one that makes the assumptions visible.
The calmer way to compare
Shortlist the quotes that explain the system, the site and the money clearly. Then compare price. A slightly higher quote may be better value if it includes work, support and realistic assumptions that another quote leaves out.
Compare solar quotes by scope first, price second. The best quote is not the one with the tidiest headline; it is the one that makes inclusions, exclusions and assumptions easy to understand.