Compare Commercial Solar Quotes

Check whether proposals expose the same technical, commercial and financial assumptions before comparing headline price or payback.

0/16comparison points evidenced

Proposed DC capacity in kWp and inverter AC capacity in kWMonthly generation model and source of solar-resource dataInterval consumption data period and treatment of missing dataSelf-consumption, export and curtailment assumptionsImported electricity value by tariff periodExport compensation or sale routePanel, inverter and optimiser specificationsProduct, workmanship and performance warrantiesMounting system, roof loading and waterproofing responsibilityGrid work, metering, permissions and legalisationMonitoring ownership, access and alertingPlanned maintenance, response times and exclusionsDegradation, availability and replacement assumptionsVAT, tax, finance and inflation assumptions stated separatelySimple payback, discounted cash flow and sensitivity methodComplete inclusions, exclusions, programme and payment stages

A checked item means the proposal provides evidence, not that the assumption is correct. Compare like with like and ask each supplier to explain differences in writing.

Use the checklist with the full method

The checklist tests whether information is present. The detailed guide explains how to interrogate it and where apparently similar proposals often differ.

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Independent commercial solar information and enquiry coordination for businesses across Spain.

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Commercial Solar Spain is an information, enquiry and coordination property. It is not the installation contractor.