How to compare solar and battery quotes
A useful comparison starts with matching the scope. Two headline prices can cover different equipment, installation work and operating assumptions.
On this page
Put the equipment side by side · Make installation inclusions explicit · Check forecasts and assumptions · Read warranty and support information · Use a simple decision record
Put the equipment side by side
Create a column for each proposal. Record exact panel model and quantity, inverter model, battery model and module count, and any gateway or EV charger. Mark anything described only by a brand name for clarification.
For solar, compare the total panel rating and inverter output separately. For batteries, record usable energy and output power. Use the manufacturer documents to check that the quoted model matches the specification you have been discussing.
Make installation inclusions explicit
Ask each supplier to state included electrical work, cable runs, monitoring setup and commissioning. Record exclusions and items that can only be confirmed after a site assessment.
If one quote includes a switchboard change or backup equipment and another does not, flag that difference before comparing totals. Ask for a revised itemised scope where the offers are not directly comparable.
Check forecasts and assumptions
If a proposal includes a generation or savings forecast, ask which consumption data, electricity tariff and operating assumptions it uses. An estimate is easier to assess when its inputs are visible.
Keep optional equipment and future upgrades separate from the initial purchase. If incentives are included in a quoted total, ask for the applicable program, eligibility assumptions and amount to be identified separately.
Read warranty and support information
Ask for the applicable product warranty documents and a written description of installation workmanship cover. Identify who receives a service request and which evidence or records they need.
Make sure the final proposal includes exact model codes. A family datasheet can describe several configurations, and a generic warranty summary may omit conditions that matter to the equipment being supplied.
Use a simple decision record
For each offer, record equipment, installed scope, exclusions, backup arrangement, monitoring, documents, support contact and unresolved questions. Then send the same questions to each supplier.
A clear decision record helps you choose a proposal that answers your needs. Keep the accepted quote and equipment schedule with the handover documents so future upgrades and support conversations start with reliable information.
Your next step
Bring your questions to Solar4life and ask for a tailored proposal with a clear equipment and installation schedule.
Sources and further reading
Australian Government — planning a solar design ↗
General buying guidance. Equipment selection and installation requirements depend on your property and the proposed system.