Start with the same scope before comparing totals
Solar quotations with different prices may cover different work. Before deciding, make a comparison table using the same installation site and requirements. Separate confirmed facts, assumptions and items that still require a survey. This helps you ask each supplier focused questions instead of relying only on the total on the first page.
List equipment in a comparable way
Request the panel models and quantities, inverter model, mounting structure, protective equipment and monitoring system. If batteries are included, list them separately. The same number of panels does not necessarily mean the systems are identical. Also ask how later equipment substitutions must be approved. Mark any item without a specified model as awaiting clarification.
Separate included work from extras
Create fields for installation, cabling, any necessary roof or electrical upgrades, testing, and paperwork the installer has agreed to handle. Ask each supplier what is included, excluded, or priced only after a survey. Clarify taxes, travel or delivery conditions, and how additional work is approved. Do not assume that an item absent from the quotation is included at no charge.
Read warranties and responsibilities
The U.S. Department of Energy's installer guide recommends asking about warranty coverage and responsibility for roof work. Its emphasis on clarity can inform comparison questions, but U.S. certifications or incentives are not requirements for Thailand. Ask for equipment and installation warranties to be separated, together with the contact for faults, potentially excluded labour or travel charges, and conditions for maintaining coverage.
Keep savings estimates tied to assumptions
If a quotation estimates electricity output or savings, ask for the supporting daytime consumption data, site conditions and electricity-price assumptions, then compare on the same basis. A forecast is not automatically a guaranteed result. If a guarantee is actually offered, request its written conditions, measurement method and exclusions, separately from general sales explanations.
Send the same questions and retain the latest version
Before choosing, send the same unresolved questions to each supplier and request a dated revision. Check that payment stages, acceptance criteria and deliverables align with the agreed scope. To consult Kintury Energy, prepare your quotation and site information and use the company's contact channels to discuss installation suitability based on actual information, without settling the system size or savings before assessment.
