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Identify the exact motion deck light first
Portfolio model SL27P-S15N-BK-1 is the motion-activated solar deck/step light associated with item 0688485. The original manual lists the deck-light assembly as SL27P-S15N-BK-TH, the screws as SL27P-SCREW and the plastic anchors as SL27P-PLASTIC ANCHOR. Keep the full suffix in your records because similar SL27P model strings exist, and a near-match can have different electronics or control behavior.
Understand the two brightness states before diagnosing it
This fixture is designed to provide a lower standby light and a brighter motion-activated output. Archived product data describes about 5 lumens in standby and 15 lumens when motion is detected, with the high-brightness period lasting about 30 seconds. A light that is glowing dimly at night is therefore not automatically failing; first walk through the sensor zone and see whether it changes to the high state.
No light at night: separate charging from sensing
Start by giving the fixture a full day of unobstructed sun, cleaning the solar surface, and then testing it in true darkness. The integrated photocell prevents normal nighttime operation when it senses daylight or strong nearby artificial light. If the light works when the panel/sensor is completely covered but not in its installed location, nearby porch or security lighting may be interfering. If it remains dead, move to battery and contact checks.
Battery replacement requires the correct rechargeable chemistry
The product record specifies one LiFePO4 14430 solar rechargeable battery. Before buying a replacement, read the original cell and match its voltage, chemistry, size, polarity and terminal arrangement. Do not substitute a disposable battery or choose a rechargeable cell solely because it fits. The charging circuit and battery must be compatible.
Motion does not trigger the brighter mode
If the standby light works but motion never produces the brighter output, the battery and LED are at least partly functional. Clean the sensor window, remove objects directly in front of it, and test by approaching across the expected detection area rather than standing motionless. Test on a properly charged night. If the fixture still stays in standby while a known-good identical unit responds in the same location, the motion-sensing electronics become the stronger suspect.
Light goes bright without anyone nearby
False triggering is usually diagnosed by looking at what changes in the sensor’s field: moving branches, pets, people on a nearby sidewalk, heat sources, reflective surfaces or rapid environmental changes. Temporarily move the fixture or block one side of the field to narrow the source. Replacing the battery will not normally cure a sensor that is being legitimately triggered by movement or environmental conditions.
High mode is weak or collapses quickly
A battery can have enough energy to sustain the low standby state but sag when the fixture demands the brighter motion state. After a strong solar charge, compare how long the high mode remains bright. If it immediately dims, inspect the rechargeable battery and contacts. Clean corrosion carefully and replace the cell only with a matching rechargeable specification. This symptom is more informative than simply saying the light is “dim.”
The light works for a few minutes after sunset and dies
Short runtime can come from insufficient charging, an aged battery, dirty solar surface or shade. Test the fixture for one full charge cycle in an open sunny location. If runtime improves dramatically, placement is the issue. If it does not and the battery is old, capacity loss is more likely. Do not judge solar performance after a cloudy day or immediately after installing a replacement battery that has not received a full charge.
Broken screws or anchors are a mounting repair
The manual identifies two screws and two plastic anchors as separate hardware. If the electronics still work but the light is loose on a stair riser or deck face, service the mounting system rather than replacing the light. Match screw diameter, head profile and anchor size to the mounting surface. For structural wood, use hardware appropriate to sound wood; for masonry, use a compatible masonry anchor. Avoid overtightening the plastic housing.
Water behind the lens or corrosion in the battery area
Occasional condensation and standing water are not the same condition. Repeated water entry suggests a crack, failed seam or cover problem. Remove the fixture from service if corrosion has damaged conductors or electronics. Drying it and reinstalling without finding the entry path usually leads to the same failure. Preserve the label and take photos before cleaning because corrosion can erase the exact model information.
Integrated LED means there is no normal bulb to change
The product uses an integrated LED. If the battery, charging, photocell and sensor behavior check out but the LED remains dark, the failure may be inside the sealed light assembly. Do not buy a screw-in or wedge bulb expecting it to fit. The original parts list treats the deck-light assembly as the service unit, which is an important clue when evaluating whether a donor fixture or complete replacement is more realistic.
Replacement planning for a stair or deck location
Measure the original mounting footprint and screw spacing before removing the failed light. Also record the approximate 4-by-4-inch face size, black finish, warm-white appearance, solar power source and motion behavior. On stairs, replacement is not only about appearance: avoid a fixture that projects farther into the walking path or creates harsh glare at eye level. If several lights line one stairway, consistent brightness and color matter.
Related Portfolio troubleshooting resources
For other solar products, use the Portfolio solar lighting guide. For exact-model research, use the model parts directory and manuals library. For deck and step applications, continue to the Portfolio deck lighting guide and step lighting guide. Those resources help distinguish a model-specific failure from a mounting or placement problem.
Test the repaired light before remounting it on the stairs
After battery, contact or housing work, test the fixture on a bench or temporary outdoor location before reinstalling the screws and anchors. Give it a full solar charge, verify that it stays off in daylight, confirm the low nighttime state, and walk through the sensor zone several times to verify the brighter motion response. A complete functional test prevents repeated holes or anchor wear on the deck surface and makes it easier to separate an electronics problem from a poor final mounting location.