Make the proposals comparable
Two quotes can look similar while covering different work. Compare the system design, named equipment, installation scope, and any battery or electrical upgrades. Ask which costs are included and which may be confirmed only after a site inspection.
Read the assumptions, not just the headline
Look for estimated production, how much energy the home is expected to use directly, and any export credit assumptions. If the provider forecasts utility price increases, ask to see the comparison with prices held steady too.
Know the people behind the paperwork
Your sales contact, installer, finance provider, and equipment manufacturer may be different organizations. Get the responsible parties in writing. Check the proposed installer’s credentials through the relevant local authority and ask who handles a service request.
Take your time with the agreement
Before committing, review the payment schedule, cancellation terms, warranties, maintenance obligations, and what happens if you sell the home. A useful proposal should make those details easy to find. Keep a copy of the version you agree to.
Further reading: U.S. Department of Energy: Consumer Solar Resources. Local rules and individual circumstances vary. This guide is general information, not a quote or financial advice.