Quaerens
Property guidance - 6 min read

Solar Panel Mis-Selling: Evidence Checklist

Solar panel complaints often involve a mix of installation documents, finance paperwork, energy savings promises and performance evidence. The review is clearer when those strands are separated.

Quick summary: Solar panel performance, finance or installer dispute? Learn which sales promises, contracts, bills and complaint replies help.

Keep the sales promise evidence

Save brochures, quotes, emails, text messages, savings projections and any statement about payback periods, bill reductions, export payments, guarantees or battery performance.

Match the promise to the contract

Keep the installation contract, finance agreement, warranty, MCS or installer paperwork, handover documents, product details and any commissioning certificate.

Gather performance and billing records

Collect generation readings, app data, export statements, electricity bills before and after installation, repair reports and any monitoring screenshots.

Record installer and lender responses

If you complained to the installer, finance provider or broker, keep every response and separate technical answers from finance or sales complaint answers.

Evidence checklist

  • Quote, contract and finance agreement
  • Savings projections and sales messages
  • Installer, warranty and handover documents
  • Electricity bills and generation readings
  • Repair, inspection or monitoring evidence
  • Complaints to installer, broker or lender
Important: This guidance is for document organisation and complaint preparation. Outcomes depend on the documents, timing, evidence and organisation involved.

Common questions

What if the system works but savings are lower than promised?

Keep the sales projection, actual bills, generation records and any explanation from the installer. The issue may be about the promise rather than total system failure.

Should finance documents be included?

Yes. Solar disputes often involve both the installer and finance provider, so keep the credit agreement, payment records and lender replies.

What if the installer has stopped trading?

Keep company details, proof of payment, warranties, finance documents and failed contact attempts. Those records may help identify the practical complaint route.

What if the savings estimate was given verbally?

Write down what was said, who said it and when, then keep any supporting emails, brochures, finance illustrations or screenshots that match the verbal promise.

Can poor installation and mis-selling be reviewed together?

Often yes. Keep installation fault evidence separate from sales promises and finance documents, because each issue may need a different explanation and complaint route.

Quaerens Consumer Rights Knowledge CentreLast reviewed: 19 August 2026Jurisdiction: United Kingdom

Practical answer and next steps

Short answer: Compare the sales promises with the contract, finance, generation records and actual savings. Separate installer issues from lender, warranty and energy-supplier issues.

Key evidence

  • Quote, contract and finance agreement
  • Sales forecast and savings claims
  • MCS certificate, warranty and commissioning records
  • Generation/export data and complaint replies

First steps

  1. Save the original documents and dated screenshots.
  2. Build one chronology of events, payments and replies.
  3. State the specific correction, refund or remedy requested.

If the complaint is rejected or ignored

Complain to the installer first. Ofgem directs installation-quality and contractual disputes toward MCS and the relevant consumer code; finance complaints may have a separate lender route.

Official sources

This is general consumer information, not legal or financial advice. Rights and deadlines depend on the facts, contract, location and current rules.