Step 1
The two offers are for different things
This fictional file compares Quote A, an engine package, with Quote B, an installed propulsion project. No real contractor or price is being represented. The owner initially sees A as cheaper, but the quotes cannot be compared until the missing responsibilities are identified. The right starting point is the diagnosed problem and intended use, not a preferred engine badge.
Step 2
Trace the removal and installation route
Write down who drains and removes the old equipment, arranges lifting, protects the accommodation and reinstates disturbed joinery. Ask the installer to inspect access before finalising the proposal. Yard days, transport, disposal and unplanned access work can sit outside an engine-package price. Specify who authorises variations and how they are recorded.
Step 3
List what remains original
A replacement engine may leave the drive, propeller, controls or other components unchanged, depending on the proposed package. Ask the responsible installer to confirm compatibility and the basis for retaining each component. Do not assume a newer engine makes the entire propulsion installation new. Obtain the warranty documents and clarify which organisation supports equipment and workmanship.
Step 4
Join the electrical and propulsion scopes
If the house battery system is also changing, give both installers the same plan. Ask who is responsible for charging arrangements, controls, protection, monitoring and the behaviour of connected systems. Manufacturer documentation describes particular products; it does not certify a complete installation or replace applicable Australian requirements. The owner’s job is to ensure the professionals’ responsibilities meet without gaps.
Step 5
Define what ready to use means
Require a documented commissioning and trial scope, any relevant inspections, operating demonstrations and a record of outstanding work. Ask who provides manuals, serial numbers, final installation information and first-service instructions. An engine that starts beside the berth has not necessarily completed the agreed commissioning process.
Step 6
Compare the revised scopes
Send the same inclusion list to both bidders. Mark each line included, excluded, allowance or unresolved, and identify taxes and validity dates. Then compare the total installed commitment, scheduling, warranty and responsibility for completion. A higher initial figure may simply describe more work. If the problem was never properly diagnosed, revisit repair or rebuild before committing to a repower.
3 QUESTIONS FOR THIS TOPIC
Questions about this example
Can I compare an engine price with an installed quote?
Only after adding the same scope to both. Removal, access, supporting systems and commissioning may materially change the total.
Does a repower guarantee a higher resale price than its cost?
Do not plan on recovering the full project cost. Evaluate the benefit to your own use and obtain vessel-specific advice if resale value matters.
Can this checklist specify my electrical installation?
No. It coordinates questions and responsibilities. Suitable professionals must design and verify the actual system.
YOUR DECISION RECORD
Prepare your next professional conversation
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References and scope
These sources provide relevant background. They did not produce or approve the fictional example above.