Module Damaged During Installation Response SOP

Purpose

A module the crew breaks with its own hands mid-install is a different animal from a freight claim or a warranty claim, and treating it like either one costs the shop. It cannot be shipped back to the carrier, and dressing it up as a manufacturer defect risks the shop's own claims standing with that manufacturer. The two real risks are quieter: a damaged unit still wired into a string with other connected modules can back-feed through the break, and a "close enough" replacement grabbed off the truck to keep the crew moving can derate an entire series string rather than just the one position. This procedure guarantees the crew stops, isolates, classifies and replaces in that order, every time, and writes down what happened so a repeating handling fault gets caught before it breaks a second module.

Scope

Covers damage the crew itself causes to a module during handling, staging, lifting or fastening on an active install, before the array is commissioned.

Does not cover carrier or freight damage found at receiving, owned by the module and inverter delivery and storage SOP, which explicitly excludes installation breakage as an internal record rather than a freight claim. Does not cover a customer-reported damage event on an already-operating array, months or years after handover, which is a warranty or insurance matter owned by the module damage and warranty claim SOP. Does not cover a module later found underperforming with no known damage event, owned by the production shortfall investigation SOP.

Roles and responsibilities

Procedure

Step 1 - Stop work at the moment of damage and control the immediate physical hazard before anyone inspects anything. Whoever caused or found it calls it out loud; work on that section of roof stops, and the area below the drop zone clears. Acceptance: work stopped, area below cleared, the unit's position marked. Wrong looks like the crew continuing to hand modules past the broken one to keep pace with the row. Stop rule: a module dropped from height or a cut crew member halts the crew regardless of whether the unit looks reusable; assess the person before the part. Hazard: broken tempered glass fragments under load, so cut-resistant gloves and eye protection go on before anyone touches the unit, and any cut gets treated before inspection continues.

Step 2 - Treat the damaged unit as energized until proven otherwise, doubly so where it is already wired into a string with other connected modules. A cracked cell layer still generates whenever it is lit. Where the position is already mated into a string carrying other landed modules, open that string at the combiner or inverter first, then confirm near-zero current at the damaged unit's own leads with a clamp meter before de-mating, since PV connectors are generally not load-break rated. Acceptance: string open, near-zero current confirmed at the damaged unit specifically, not assumed from the string breaker's position. Wrong looks like de-mating a cracked module's connectors by feel because "the breaker's already off." Stop rule: any doubt about which string a position feeds is resolved from the day's own wiring map before disconnecting anything, never by tracing conduit by eye.

Step 3 - Classify the event as a single-unit incident or a jobsite stop. Multiple modules broken in one event, any injury, or damage to the roof deck or structure itself halts the whole crew until a lead has assessed the wider scene, not just that position. Acceptance: one of two calls made and stated to the crew, continue at this position only, or stop the jobsite. Wrong looks like handling a multi-module drop as a series of separate single-unit incidents while work continues elsewhere on the same roof. Hazard: a hoist, wheelbarrow or ladder failure that dropped one module can fail again on the next lift; that equipment is inspected before its next use, not just the module.

Step 4 - Inspect against condemning criteria before deciding whether the unit can still go on the roof. Condemned outright: any cracked or shattered glass, a frame bent or twisted beyond the manufacturer's clamp-zone tolerance, a lifted or cracked junction box, or damaged leads or connectors. Cosmetic and installable: a surface scuff on the frame or backsheet with no cell, glass, frame or electrical damage. Acceptance: a stated pass or condemn call against these specific criteria, not a visual impression. Wrong looks like installing a hairline-cracked module because it still reads normal output on a quick meter check; a cracked laminate is a moisture path regardless of today's reading. Stop rule: a condemned unit is marked and set aside immediately, never leaned back against the working stack where it gets picked up again by mistake.

Step 5 - Record the incident before the unit leaves the roof. Photograph the damage, the serial and the intended position; note the cause and who was on the task. Acceptance: photograph set and cause filed against the serial the same day, not at week's end. Wrong looks like a verbal "we broke one, grab a spare" with nothing written down, which leaves the shop no way to see a fastener or handling fault repeating across jobs. Hazard: none at this step, it is paperwork, and it depends on step 1's area already being cleared before anyone lingers at the position to photograph it.

Step 6 - Disposition the unit honestly, and do not route crew-caused damage as a manufacturer or freight claim. Where the cause is the crew's own handling, write the unit off as a shop loss rather than filing it against the module warranty or a carrier claim; misrepresenting the cause to either party is the kind of claim that gets a shop's future submissions scrutinized. Acceptance: disposition recorded as shop-caused breakage, the condemned unit segregated from resalable stock. Wrong looks like boxing a dropped module back up to return as if it arrived damaged from the supplier. Hazard: none at this step; it is a documentation and integrity call, not a physical task.

Step 7 - Source a matched replacement before the crew reaches that position, and do not substitute on wattage alone. Check the replacement's current and voltage figures against the original datasheet, not just its rated power; a nameplate-matched wattage from a different bin can still carry a different operating current, and on a string inverter with no module-level electronics the string runs at its weakest member's current, so a mismatched unit quietly derates every module on that string, not just the one position. Acceptance: current and voltage figures checked against the original datasheet and matched, or the position skipped and returned to rather than filled with a near-enough unit. Wrong looks like grabbing whatever spare sits on the truck because the crew is already at that row. Stop rule: no confirmed electrical match means no install at that position; skip it, sequence around it, and return once a matched unit is staged.

Step 8 - Restore the string, then verify before anyone leaves the roof. Torque the replacement's clamps within the manufacturer's published clamp zone, re-mate the connectors, and close the string back in at the combiner or inverter. Before the crew leaves that section, check the string's reported voltage and current against the expected range set by the array's other identical strings. Acceptance: string restored, voltage and current within the normal spread of its sibling strings, read on the platform or with a handheld check. Wrong looks like closing the string back in and moving on without a reading, on the assumption that it "looks right." Hazard: this is the resume step for what step 2 opened, and it carries its own check, not just a visual sign-off: closing a string back in re-exposes the same connectors to line voltage, so hands stay clear of any connector until the final one is fully seated.

The record this produces

One breakage record per event: the serial and position, photographs of the damage, the cause and who was on the task, the condemn or cosmetic call, the disposition as shop loss, and the replacement's matched electrical figures against the original datasheet. The restore-and-verify reading closes the record.

Warehouse reads this to track whether a wheelbarrow transfer, a ladder lift or a torque habit is repeating across jobs; the same pattern showing up twice is a training gap, not two unrelated accidents.

Worked pass

A 30-module residential job, crew racking the final row. A module slips from a wheelbarrow being walked up an extension ladder and lands glass-down on the roof edge, shattering.

Step 1: the carrying crew member calls it immediately, the two techs on the ladder stop, the ground below is already clear from the crew's standard ladder-lift spotter; no injury.

Step 2: the position was not yet wired, but the string it belongs to already has eleven of thirteen modules landed and mated. The string is opened at the combiner, and the shattered unit's own leads read near-zero current before anyone touches them.

Step 3: single-unit incident, no roof or structural damage; the crew continues at other rows while the lead handles disposition.

Step 4: glass shattered across roughly a third of the surface, condemned outright, set aside immediately away from the working stack.

Step 5: photographed with its serial and intended position, cause noted as a wheelbarrow-to-ladder transfer without a second set of hands steadying the load, filed the same day.

Step 6: dispositioned as shop-caused breakage, not filed against the module warranty.

Step 7 fails. The truck's spare stock carries the same model number but a different wattage bin than the rest of the array; the spare's current and voltage figures do not match the original datasheet. The stop rule runs: no install with the mismatch, even though the difference is small and the position would probably work fine. The position is skipped, the row sequenced around it, and the office is texted to pull an exact-bin unit from the warehouse for next-day delivery.

Step 8: the following morning, the matched unit is clamped in, torqued within the clamp zone, and the string closed back in at the combiner. The platform shows the string's voltage and current inside the same range as the array's other strings before the crew leaves the roof.

References

• The module installation manual for handling, clamp-zone torque and two-person carry requirements.
• NFPA 70E-2021, 120.5 for live-dead-live verification and 29 CFR 1910.333(b)(2) for electrical work practices (29 CFR 1926.417 in construction).
• 29 CFR 1926 Subpart M and 29 CFR 1910.28 for fall protection, applied by activity classification.
• See related: the module and inverter delivery and storage SOP for carrier or freight damage, and the module damage and warranty claim SOP for a customer-reported event on an already-operating array.