Warranty terms, PEC compliance and who answers the phone in year six matter more than the price on the quotation.
Ask who performs the structural assessment of the roof, and whether it is documented. A rooftop array adds load and wind uplift for 25 years.
Ask for the Philippine Electrical Code compliance details and the name of the licensed electrical practitioner signing the plans.
Separate the product warranty from the workmanship warranty. A 25-year panel warranty is meaningless if the installer offers one year on labour.
Finally, ask what happens in year six when an inverter faults. Companies with a maintenance division answer that question very differently from one-off installers.
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