Note
After Installation: Managing the Commissioning Wait
When physical installation is complete on a factory solar or LED retrofit project, two things are true at the same time. The crew’s core work is done. The customer’s system is not yet running.
Between those two points there is a gap: days or weeks pass before the system is commissioned, the grid connection is approved, or the final acceptance test is completed. That gap is a normal feature of large electrical installations in Thailand, not a failure. What matters is how the contractor manages it.
What Does “Installation Complete” Actually Mean?
The answer depends on the project type, but the pattern is consistent.
For a rooftop solar installation, “installation complete” typically means:
- Panels are mounted, wired to combiners, and visually inspected
- Inverters are in position and connected to the internal AC distribution board
- Conduit runs and cable management are in their final position
- The work has passed a basic visual and continuity check by the site lead
What is not yet done: the interconnection application to PEA or MEA, the utility metering inspection, and the live commissioning run under load. Until those steps are complete, the system produces no electricity.
For a factory LED retrofit, “installation complete” in a given zone means fittings are mounted, circuits are powered, and basic lamp function is confirmed. What is not yet done: lux measurements at working height, controls programming for zones with occupancy sensing, and the formal acceptance test that goes into the handover record.
The specific steps differ by project. The management problem is the same: physical work is finished, the crew has moved on, and the project is not closed.
Why Does This Gap Create Problems?
The gap is manageable when someone owns it. It becomes a problem when nobody does.
The crew has moved to the next job. This is correct and expected. The problem is that the site lead held the site-specific knowledge: the configuration details, the customer contacts, which items were left as noted deviations. When the crew leaves without transferring that context, the next person who needs to pick up the commissioning steps is starting cold.
The customer is asking when the system will be live. They see panels on the roof or new fittings across the factory floor, and they want a date. If the contractor does not track the remaining commissioning steps, the answer is a guess rather than a plan.
Billing may be tied to commissioning. A common contract structure places the final payment at “system commissioned and accepted by the customer’s representative.” If the contractor does not manage the commissioning steps, the invoice waits. A commissioning wait that drifts from three weeks to two months because nobody was chasing the approval means the final payment lands months after the physical work was done.
What to Assign Before the Crew Leaves
The day physical installation is confirmed complete, three things need to be assigned to specific people inside the contractor’s business.
The commissioning steps owner. One person in the office, not on the installation crew, takes responsibility for every remaining step: submitting documents to the utility, booking the metering inspection, scheduling the acceptance test, following up when steps stall. This person holds a written list of remaining steps with an expected completion date for each.
The customer contact. On site, the customer spoke to the site lead. After the crew leaves, that role transfers to a named coordinator or to the owner directly. The customer should know who to call for status updates before the truck drives away.
The installation documentation. Photographs, as-built notes, equipment serial numbers, and any agreed deviations need to leave the site before the crew does. If a commissioning step requires a document the contractor cannot produce quickly, it stalls while someone searches for it.
Can You Issue a Partial Handover Before Commissioning?
A full handover document requires a commissioned and tested system. When there is a defined commissioning wait, a partial handover covers what is genuinely finished.
A partial handover document includes:
- Description of physical work completed, referenced to the contract specification
- Photographs with dates and location notes
- Equipment list with make, model, serial numbers, and quantities
- Any deviations from the original specification, agreed in writing
What it does not include: the commissioning test record, the utility approval reference, or measured system performance. Those go into a supplementary completion note when commissioning is done.
A partial handover lets the progress payment for physical installation proceed without conflating “panels up and wired” with “system accepted.” The final payment milestone, and the signed full acceptance, follows commissioning.
When Does the Warranty Clock Start?
This needs a written answer in the contract before mobilization, not after commissioning.
Two common positions:
-
The warranty starts on the date of the signed full handover, including commissioning. This ties the warranty to a functioning, accepted system.
-
The warranty starts on the installation-complete date, meaning the clock runs through the commissioning wait. The customer is consuming warranty before the system is live.
Neither is unreasonable. The problem is leaving it undefined. An undefined warranty start becomes an argument when the first callback arrives and both parties have a different idea of when the twelve months began.
A concrete example: installation is complete on day 22. Grid connection is approved and the full handover is signed on day 55. “Twelve months from signed handover” means the warranty runs until day 55 of the following year. “Twelve months from installation complete” means day 22. A callback in that 33-day gap is expensive to resolve without a written start date on file.
FAQ
Can the customer handle the grid interconnection step directly?
Yes, and some contracts are structured this way. The contractor completes the installation and provides the required documentation; the customer’s engineer handles the utility application and follows up with PEA or MEA. This works when the customer has in-house engineering capability and existing utility contacts. It needs explicit agreement in the contract, including what the final payment milestone looks like if the approval is delayed.
What if the commissioning wait runs longer than expected?
Document the contractor’s position on the day physical installation is complete: which steps are done, which remain, who owns each, and what the expected timeline is. A written contemporaneous record is far stronger than a reconstruction months later when a billing dispute surfaces.
Does a commissioning delay extend the defect liability period?
The contract governs this. If the DLP runs from “installation complete,” a commissioning delay does not extend it. If the DLP starts from “signed full handover,” a delay pushes the start later. Confirm the wording before mobilization and record the installation-complete date in writing regardless of which structure applies.
The TRACE 30 program builds a site register from every closed job. Each entry carries the installation-complete date, the full handover date, the warranty start, and the next inspection. For projects where those are different events, both dates appear so the owner’s screen shows exactly where each site stands. Read how the program works at /program/ or schedule a short call to walk through how it fits your current project load.