Quick Answer
A plug and two panels do not make a safe, compliant kit. The optimal configuration depends on your actual consumption, roof orientation, battery needs, and choosing the right export tariff.
Start with the proposed operating mode
Ask whether the kit is designed for zero export or export. That choice controls required equipment and procedures. A seller should identify nominal inverter output in VA, maximum panel input, connection method and the documents supplied for Spain.
Microinverter evidence
- Manufacturer and exact model, not only a marketplace brand.
- EU declaration of conformity and applicable grid-interface evidence.
- Anti-islanding behavior and reconnection settings.
- Maximum AC output, leakage-current data and protection requirements.
- Outdoor ingress rating and operating-temperature range.
- Spanish warranty contact and firmware-support policy.
Panel and mounting checks
- Exact panel dimensions, weight and electrical limits.
- Mounting approved for that panel and balcony construction.
- Documented wind resistance and corrosion-compatible hardware.
- Connector compatibility; avoid mixed connector brands unless explicitly approved.
- Cable length that reaches safely without permanent extension leads.
Commercial warning signs
Walk away when the seller says 800 W means “no rules,” refuses to provide documents before purchase, advertises guaranteed annual savings, suggests attaching panels with generic ties, or cannot explain export control. A CE logo alone is not a full technical file.
Documents to retain
Keep the invoice, serial numbers, data sheets, declarations, installation instructions, mounting calculations, installer findings, community or landlord consent, photographs and commissioning records. These support warranty, insurance and future property questions.