1
What exactly is included and excluded?
Ask the supplier to separate included work, exclusions, and buyer-side responsibilities.
Written proof
[ ] Yes[ ] No
Perovscope Guides
12 questions to ask before choosing a solar supplier
Use one copy per supplier. Capture the answer, mark whether it was confirmed in writing, and carry unresolved gaps into proposal comparison.
2
Which exact module and inverter models are proposed?
Capture model numbers, datasheets, certifications, and substitution rules.
Written proof
[ ] Yes[ ] No
3
Who owns DISCO approval and documentation?
Confirm who prepares drawings, submissions, revisions, meter coordination, and handover evidence.
Written proof
[ ] Yes[ ] No
4
What assumptions drive the savings and payback claim?
Separate self-consumed units, exported units, tariff basis, and downside-case assumptions.
Written proof
[ ] Yes[ ] No
5
What happens if site conditions differ from the proposal?
Ask how roof condition, shading, cable routes, structure, and access issues affect price or schedule.
Written proof
[ ] Yes[ ] No
6
Which protections and balance-of-system items are included?
Check structure, breakers, earthing, surge protection, wiring, monitoring, and commissioning scope.
Written proof
[ ] Yes[ ] No
7
How are warranties claimed in practice?
Name the local support path, response owner, documentation needed, and warranty exclusions.
Written proof
[ ] Yes[ ] No
8
What are the payment milestones?
Tie payments to clear delivery, installation, commissioning, and documentation milestones.
Written proof
[ ] Yes[ ] No
9
What timeline is realistic and what can delay it?
Separate supplier work, buyer dependencies, DISCO dependencies, import availability, and weather delays.
Written proof
[ ] Yes[ ] No
10
What evidence will be provided at handover?
Ask for as-built documents, test reports, monitoring access, warranties, invoices, and approval records.
Written proof
[ ] Yes[ ] No
11
Who responds after installation if something goes wrong?
Capture escalation contacts, response times, site visit process, and post-sale support boundaries.
Written proof
[ ] Yes[ ] No
12
Can all answers be reflected in the quotation or contract?
Move important promises from calls or messages into the commercial document before award.
Written proof
[ ] Yes[ ] No