What does this solar pv inverter quarterly checklist cover?

15 items across 5 sections, covering approach and labels, status and production, cooling, enclosure, and more. Each item spells out what the person walking the job is actually looking for, not just a box to tick.

Who should run this inspection?

The PV or electrical service tech on the quarterly round.

When in the schedule should this walk happen?

Every quarter, energized during daylight so the unit is producing and cooling faults show under real load.

Why do these items ask for a photo?

10 of the 15 items call for photo evidence, 10 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.

What most often fails a solar pv inverter quarterly inspection?

Green status light taken as healthy while the event log shows repeated ground-fault or arc-fault trips clearing themselves. One inverter quietly underproducing next to its neighbors on the same roof, never caught because outputs aren't compared side by side. Intake filter blinded with pollen so the unit derates in the afternoon heat and no one connects the derate to the filter.

Can I use this checklist in RTI?

Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

Free checklist

Solar PV inverter quarterly maintenance checklist

A quarterly PV inverter round is short on purpose: it catches the wear items that fail between annual services. This checklist is sized for a tech with a phone. Every item says what to look at and the photo that proves the round happened. Work is commonly verified against NEC (NFPA 70), manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.

Start free with this checklist Download as PDF

The checklist

Every item, and the photo evidence it needs

The photo count on each row is what RTI would require before the item can be submitted. Work the list here and watch the gate hold, or load it into RTI and let it enforce the real thing.

Approach and labels

PV source circuits treated as live on the approach
DC conductors stay energized whenever light reaches the array, even with the inverter off, so no cover is opened on the round and PPE follows the site's arc-flash risk assessment.
No photo
Inverter nameplate and warning labels legible
Nameplate ratings and the PV and dual-source warning labels on the unit readable, a faded or missing label reported to the owner.

Status and production

Status indicators and event log reviewed
Fault and warning history read from the display or portal, not just the front light, recurring trips noted for follow-up.
Output compared against the other units on site
Instantaneous output read and compared against the other inverters or strings under the same sky, any low outlier flagged.
Production since the last round compared with expected yield
Energy total read from the display or monitoring portal and compared with the expected figure for the season and weather, a shortfall flagged for follow-up.
DC input and AC output values read off the display
DC voltage and current per input and AC voltage and frequency read against the nameplate range, any value outside it noted for follow-up.
Active fault indicators clear on the display
No active ground-fault indication, or arc-fault where fitted, and the insulation reading compared with last quarter for a falling trend where the inverter reports one.

Cooling

Cooling fans, heatsink and filters checked
Fans running, heatsink fins and intake filters clear, no dust blanket driving the unit into thermal derate.
Airflow clearance around the inverter kept open
Nothing stored against the unit or its heat sinks, the maker's side and top clearances kept, and no new equipment or shade blocking the exhaust path.

Enclosure

Enclosure sealed and mounting secure
Cover gaskets and cable entries sealed, no moisture, corrosion or pest signs at vents, seams and conduit entries, mounting and conduit tight to the wall.
DC and AC disconnects closed, guarded and lockable
Handles undamaged and in the on position, covers closed, lock provisions intact and disconnect labels legible, all checked without opening either switch.
Rapid shutdown initiator reachable on building-mounted arrays
Initiator at its marked location set to run, nothing stored in front of it and its placard legible; looked at only, never operated on the quarterly round.
No photo
String combiners walked where the array uses them
Combiner covers closed and latched, no heat marks, water or broken conduit at the enclosure, fuse status lights clear where fitted; boxes left closed on the round.
No photo

Monitoring and records

Monitoring alerts confirmed reaching the owner
On sites with a monitoring link, the portal shows the inverter reporting with no data gap since the last round and alert notices reaching someone the owner names.
No photo
Round findings and production shortfall sent to the owner
Yield against expected, recurring faults and low inputs sent to the owner, with any item that needs the DC side opened put on the annual service list.
No photo

What usually sends this back

The failures are almost always the evidence, not the work

Green status light taken as healthy while the event log shows repeated ground-fault or arc-fault trips clearing themselves.
One inverter quietly underproducing next to its neighbors on the same roof, never caught because outputs aren't compared side by side.
Intake filter blinded with pollen so the unit derates in the afternoon heat and no one connects the derate to the filter.

Verified against

NEC (NFPA 70)

Common questions

6 answers

What does this solar pv inverter quarterly checklist cover?: 15 items across 5 sections, covering approach and labels, status and production, cooling, enclosure, and more. Each item spells out what the person walking the job is actually looking for, not just a box to tick.
Who should run this inspection?: The PV or electrical service tech on the quarterly round.
When in the schedule should this walk happen?: Every quarter, energized during daylight so the unit is producing and cooling faults show under real load.
Why do these items ask for a photo?: 10 of the 15 items call for photo evidence, 10 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.
What most often fails a solar pv inverter quarterly inspection?: Green status light taken as healthy while the event log shows repeated ground-fault or arc-fault trips clearing themselves. One inverter quietly underproducing next to its neighbors on the same roof, never caught because outputs aren't compared side by side. Intake filter blinded with pollen so the unit derates in the afternoon heat and no one connects the derate to the filter.
Can I use this checklist in RTI?: Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

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Run it with the Photo Gate

A checklist nobody can submit half-finished

Load this list into RTI, stick a QR tag on the area it covers, and the submit button stays locked until every mandatory item is answered and the 10 required photos exist. Approved walks roll into a branded turnover package with a tamper evident record behind every line.