Check one quote or compare two

Manual entry, no email, account or upload. Leave unstated numbers blank. Findings identify missing information and arithmetic to clarify, not installer quality or a market-price score.

Quote A
Equipment and quoted financial assumptions
Installation scope and warranty

What this check can establish

Panel count times module wattage should match array kWp within a documented rounding tolerance: the larger of 0.05 kWp or 1%. Claimed simple payback should match cash cost divided by stated annual benefit, allowing the larger of 0.5 years or 5% rounding difference. These are arithmetic checks, not technical approvals.

The checker asks whether scaffolding, electrical work, commissioning, certification, backup and warranties are included or excluded. Not stated is a distinct state. Follow a worked quote example if you need help finding the figures.

Where a financial comparison is incomplete

A financed proposal without its cash price cannot be compared directly with a cash total. A self-consumption percentage that includes storage cannot be credited as direct solar use plus additional storage. Combined solar-and-battery prices are not divided by array kWp or assigned an invented battery cost.

Any shared-model annual estimate is shown separately from the original quote claim. It assumes metered exports and no battery benefit. Battery-only or storage-inclusive claims need further inputs. A cheaper quote is not automatically better. Test a clarified scenario in the payback tool.

Sources and review dates

Research-based guidance. Source checks do not imply product testing or verification of an individual installer.

  • Energy Saving Trust: Solar panels. Solar suitability, generation, roof and installation considerations; not a local quote dataset. Scope: UK. Checked .
  • Energy Saving Trust: Battery storage. Storage losses, scope of cost estimates and possibility that savings do not justify battery cost. Scope: UK. Checked .
  • Ofgem: Smart Export Guarantee. Eligibility and supplier-set export terms; export payments are not installation grants. Scope: Great Britain. Checked .

Registry sources-2026-11-01. Tariffs have a 30-day internal review interval. Methodology and assumptions.

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