What to Check During the Final System Walkthrough
When the crew invites you outside to admire the array from the driveway, the panels look finished — but the acceptance details that surface months later usually sit beside equipment you never walked past. This walkthrough order keeps you at ground level first, where labels, conduits, and shutdown points actually live.
Start where the power lands, not where the sun hits
The inverter, combiner, or battery gateway typically mounts in a garage, utility room, or exterior wall cavity near your main service panel. Ask your installer to trace the path aloud: roof modules, rapid-shutdown device if present, dc combiner or optimizer hub, inverter, production meter, and the backfeed breaker. You do not need to open enclosures yourself; the goal is to hear the sequence once while someone who mounted everything is still on site.
When crews skip this narration, homeowners later struggle to explain which conduit feed matches which roof section during a service call. Five minutes beside the equipment prevents that confusion and gives you vocabulary for phone support if a string stops producing.
The combiner box label that often ships blank
Many installations include a dc combiner or junction box between the roof homerun and the inverter feed. Electrical codes require permanent labels identifying rapid-shutdown boundaries and maximum voltage. Factory labels sometimes arrive empty, waiting for the installer to fill in string counts and equipment ratings by hand.
Watch for these patterns during the walkthrough:
- Blank adhesive fields where handwriting or a printed insert should appear
- Labels placed on the inside of a door you cannot read when the cover is closed
- String numbers on the rooftop layout diagram that do not match the physical labels on the combiner
- Peeling edges on temporary marker tape that will not survive the first summer heat cycle
If a field is blank, ask the installer to complete it before you sign acceptance paperwork. Re-laminating a label after the crew leaves often means scheduling a return visit and delaying the warranty start date your contract references.
Conduit, penetration seals, and grounding bonds
Walk the exterior route where conduit climbs the wall or enters the attic. These details rarely affect production on day one. They matter when an inspector revisits, when water intrusion appears after the first storm season, or when you add battery storage later and need to confirm existing grounding paths.
- Flashing boots seated flat with sealant continuous around each roof penetration
- Conduit straps at regular intervals, not floating loose where wind can vibrate connections
- Grounding electrode conductor visible where it bonds to the equipment grounding bar
- No sharp bends kinking the dc homerun where it turns into the attic space
Demonstrations worth seeing in person
Cloud cover can hide production issues, but you can still confirm that equipment responds the way your installer describes. Before keys go back in the truck, request live demonstrations of:
- Normal inverter status indicators during daylight production or standby mode
- The emergency shutdown or rapid-shutdown initiation point and where labels mark it from the approach path
- How to read the utility production meter versus the inverter display — they should trend together on a sunny segment of the visit
- Any monitoring gateway LED pattern that signals communication loss versus normal polling
If production is too low to show meaningful numbers, ask the installer to explain fault codes you might see later rather than assuming you will remember idle-state readings from memory.
A seasoned inspector once told us: homeowners remember the roof photo, but files remember whether the combiner was labeled. Beauty shots satisfy the checklist feeling; labeled equipment satisfies the people who arrive during an outage.
When to pause before signing
Signing immediately feels polite, especially when the crew has been on your roof for days. Slow down if you cannot locate the physical equipment that matches each item on the walkthrough checklist, if serial number photos were not taken while labels were still accessible, or if the installer references documents that are not in your hand yet.
None of those gaps automatically means the installation failed. They mean the handover is incomplete. Resolve them while someone licensed is still accountable on your property. You can appreciate the array from the driveway afterward — the equipment room is where the paperwork you sign will be tested.
