Two quotations can describe different projects even when their headline system capacity looks similar. A fair comparison starts by aligning the scope, equipment and operating assumptions before comparing the total amount.
Create a like-for-like equipment list
Record panel and inverter model numbers, quantities and any battery details. Include mounting, monitoring and electrical work. Ask each supplier to identify exclusions and items subject to later inspection. A missing line item may explain an apparent price difference.
Compare the service commitment
Review installation responsibilities, handover documents and written support terms. Ask how changes will be approved and what happens if the final site assessment changes the design. Avoid choosing solely on a per-capacity figure when the underlying work and equipment are different.
Build a scope comparison before choosing a price
Place the two proposals side by side and record exact models, quantities, mounting, electrical work, storage, monitoring, labour and exclusions. Mark any missing item as a question rather than guessing its value. Check whether both suppliers used the same backup requirement and site assumptions. A lower total may reflect a different scope, so obtain an explanation before treating either price as the better deal.
Your practical checklist
- Align full equipment model numbers
- List inclusions and exclusions
- Compare written support and handover scope
Must the cheaper quotation use worse equipment?
No. Price can differ for many reasons. Compare the documented scope and ask about differences directly.
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