A supplier advises that the quoted inverter is unavailable and offers another model. The price seems similar, the delivery date is attractive and the installation booking is approaching. It is tempting to update the purchase order and resolve the paperwork later.
That can leave the quote, design, network record and customer expectations describing different systems. A product substitution is easier to manage when it begins as a visible proposal with decisions attached, rather than a quiet edit across several screens.
This article sets out an original coordination workflow. The example is hypothetical, and the workflow does not assess whether any particular replacement product is suitable.
Open a change request before changing the order
Give the proposed substitution a reference linked to the job. Record the original product, proposed replacement, reason, requester and affected date. Attach the supplier's message and exact model references, including any suffix that distinguishes the offered product.
Keep “proposed” visible until the relevant decisions are made. The person entering a replacement into a purchasing system should be able to see whether it is an option under review or a released instruction.
Identify which activities depend on the answer. Purchasing may need a decision before a supplier deadline, while installation scheduling may need confirmation that revised documents and approvals are in place. Ask the authorised business owner to decide how those dependencies affect the job.
Verify the exact product before technical review
Collect current manufacturer information and identify the source and date checked. An administrator can retrieve specified documents and flag a mismatch between a model reference and a listing. They should not infer that two similar names describe the same product.
For STC-eligible systems, the CER requires installed PV modules and inverters to appear on the approved product lists and be installed and commissioned before their listed expiry dates. CER: system components.
Listing is only one check. SAA assigns the designer responsibilities including equipment ratings, suitability and compatibility between the array configuration and inverter specification. Those decisions need the responsible professional's assessment of the actual system. SAA Technical Requirements, section 3.3.
If a source is missing or unclear, record the question and route it to the appropriate reviewer. Do not convert a supplier's assurance into a technical approval.
Route the substitution across five affected areas
Use a change record that shows each review separately. One person's approval of price should not appear to settle a designer's question or a network requirement.
| Area | Decision or evidence to obtain | Record that may need updating |
|---|---|---|
| Commercial scope | Authorised decision about price, availability and contract implications | Quote, variation and purchasing instruction |
| Technical design | Responsible designer's assessment and required revisions | Design files and equipment schedule |
| Network position | Applicable distributor process, correspondence and outcome | Application or connection agreement records |
| Customer communication | Explanation of the proposal and required customer decision | Customer correspondence and agreement record |
| Delivery and job documents | Confirmation that supplied equipment and released instructions match | Delivery check, installer pack and subsequent records |
This is an internal coordination tool. The relevant professionals and business owners determine the actual requirements and approvals.
Give each row an owner, status, source link and next action. Mark a row “not applicable” only with a recorded reason from the responsible person. Our PV design support guide explains the distinction between preparing records and making professional decisions.
Recheck the relevant network position
Do not assume the original connection position covers a different system. Identify the distributor and ask the responsible applicant or technical person what the proposed change requires under the current process.
For Energex jobs, its installer guidance addresses applications for system changes, including inverter replacements and capacity amendments. Its homeowner guidance also requires approval before changes such as swapping an inverter are made. These are Energex requirements; use the applicable distributor's guidance elsewhere. Energex: connection essentials, Energex: system changes.
Keep a submitted request separate from the required outcome. Link the response to the proposed equipment version so an approval relating to the original model is not mistaken for a decision on the replacement.
For Queensland application tracking, see the grid connection workflow.
Give the customer a decision they can understand
Ask the commercial owner to prepare a clear explanation of what is proposed, why it is proposed and what remains to be confirmed. Identify any change to the supplied product, agreed scope, price, stated warranty information or expected timing that needs the customer's attention.
Use the actual contract and applicable obligations to determine how the change must be agreed. A copied-in email or a customer saying they received a message should not automatically become your record of acceptance.
Avoid describing a replacement as “better” or “equivalent” unless the relevant claim has been substantiated. Record the customer's response and any remaining questions. If they decline the proposal, keep that outcome attached to the request so it cannot reappear later as an approved alternative.
Match delivered equipment to the released records
Return to the hypothetical unavailable inverter. Suppose the technical and commercial reviews are complete, the required network action is resolved and the customer agreement is recorded. The coordinator can now distribute the authorised documents and purchasing instruction through the agreed process.
There is still a receiving check. Have the responsible recipient compare the delivered model identification with the released equipment schedule and report discrepancies before the item moves further through the job. A purchase order describing the approved product does not prove that the delivered item matches it.
If a discrepancy appears, reopen the change record and obtain direction. Do not rewrite the approved schedule to match the delivery simply to remove the mismatch. Preserve the actual records and let the responsible people determine the next action.
Close the change when the evidence is complete
A Filipino solar administrator can maintain the change record, chase decisions, organise source documents and prepare the authorised updates. Their role is valuable because it keeps separate decisions connected without replacing the people accountable for them.
Before administrative closure, check that the decision history is retrievable, affected records are current and unresolved actions remain assigned. Keep rejected proposals as history, clearly separate from the equipment actually authorised and supplied.
Review recurring causes: unavailable stock, ambiguous model references or late commercial changes. Improve the request process where those patterns create avoidable rework.
Contact Nexus about solar administration support to organise the coordination around your technical team. One visible substitution record can give everyone a clearer route from proposal to documented outcome.
