Equipment should be named, not described
The proposal should identify panel manufacturer and model, inverter or microinverters, mounting system and any battery equipment. Terms such as premium panel or smart battery are not specifications.
Check whether monitoring includes household consumption as well as solar production. Ask who owns the monitoring account and whether the customer retains access after installation.
Production needs assumptions you can inspect
A predicted annual total should be supported by the roof orientation, pitch, shade allowance and system losses used in the calculation. Monthly figures help expose seasonal mismatches.
Savings depend on how much generation the property uses directly and how exported energy is valued. If the quote treats every unit as though it replaces a full-price imported unit, ask for the calculation to be revised.
The installation scope extends beyond the panels
Look for mounting, cable routes, isolators, protection devices, equipment positions, access arrangements and any work required at the consumer unit. Scaffolding or lifting equipment should be included or clearly excluded.
For battery backup, the quote must state which circuits are supported and the switching equipment provided. Phrases such as blackout protection are too broad without a circuit and load design.
Paperwork, warranties and handover
The quote should say who handles electrical certification, Andalucía registration, municipal requirements and surplus-compensation documentation. Ask which documents will be handed to the owner.
Separate equipment warranties from workmanship cover. Record the warranty provider, claim route and what happens if the original installer is unavailable. Payment stages should follow defined milestones rather than vague promises.