How to Choose a Solar Installer: Compare More Than the Price

Choosing a solar installer in the Philippines requires more than comparing advertised package prices. The provider will be responsible for a system that connects to the property’s roof and electrical installation, so the design process, installation quality, utility coordination and after-sales support all matter.

A reliable selection process checks evidence and written commitments rather than relying on a sales presentation alone.

Check experience relevant to your project

Ask for examples of installations with a similar property type, roof, system configuration or capacity. Request references where available and review whether the provider can explain the role it performed on those projects. A residential rooftop project may not demonstrate experience with a commercial facility, battery backup or a complex electrical service.

Ask who will conduct the site survey, prepare the design, supervise installation and commission the system. Clarify the qualifications and responsibilities of the people performing electrical and other regulated work.

Review the site assessment and system design

A serious proposal should use the property’s electricity information and inspect or verify relevant site conditions before finalizing the design. Ask how shading, roof condition, orientation, structural constraints, cable routes and electrical protection are considered.

The design should identify panel and inverter models, capacity, expected output and system limitations. NREL’s PVWatts resource explains that energy predictions are based on assumptions and contain uncertainty. Be cautious of a provider that presents estimated production or savings as guaranteed.

Evaluate installation scope and safety

Ask for a written description of mounting, wiring, protective devices, grounding, labelling, isolation, testing and commissioning. Confirm whether roof repair, electrical upgrades, permits, inspections, utility applications and meter-related work are included or excluded.

For grid-connected projects, confirm the provider understands the applicable utility process. The ERC’s amended net-metering rules and the DOE’s 2026 circular for specified zero-export and micro-solar systems cover different arrangements; ask the installer to explain which pathway is relevant to the design.

Read warranties and support terms

Separate manufacturer warranties from installation workmanship coverage. Ask who files a product claim, whether labour or transport is covered and how service requests are handled. Confirm the monitoring setup, maintenance recommendations and support contact after commissioning.

Compare proposals consistently

Give each provider the same project brief. Compare exact equipment, capacity, expected output assumptions, complete scope, exclusions, payment milestones, warranties and support. The solar quote comparison guide includes a practical framework, while the complete quotation checklist identifies details to request.

Warning signs to investigate

• A guaranteed savings or payback promise without a transparent calculation.
• No clear equipment models or written installation scope.
• Pressure to pay before important site or utility questions are resolved.
• Unclear responsibility for permits, inspections or net-metering applications.
• Vague warranties or no named process for after-sales service.
• Refusal to identify exclusions or explain design assumptions.

A warning sign should prompt questions and written clarification. It should not be replaced by an assumption that every provider using a particular marketing label is qualified.

Make the agreement specific

Before paying a deposit, confirm the provider’s legal identity, deliverables, equipment schedule, milestones, completion conditions, payment schedule, change process, warranty terms and handover documents. Choose a provider that can explain the technical and commercial details clearly and stands behind the commitments in writing.

Official and technical references

• ERC: 2025 amended net-metering rules
• DOE: 2026 own-use solar policy circular
• NREL: PVWatts