Field Notes
The Panels That Look Fine and Still Lose Money
A solar array can look perfect from the ground and still be quietly underproducing. Here is what a radiometric thermal sweep sees that your eyes — and usually your inverter readout — cannot.
A failing solar panel rarely announces itself. There is no smoke, no scorch mark you can spot from the ground, no alarm on the wall. What a failing panel does is get hot: a dead cell, a failed bypass diode, or a string that has stopped earning starts turning sunlight into heat instead of electricity. From the ground the array looks fine. On a radiometric thermal sensor — every pixel a temperature measurement — it glows.
What shows up
The faults a sweep locates at panel level: dead cells and dead strings, hot spots, bypass-diode failures, and delamination patterns. Each one is marked on the array imagery with visible-light companion photos of the flagged panels, so your electrician walks to the exact panel instead of testing rows at random. The findings come back ordered by what they are costing you — a dead string out-earns a single weak cell every sunny day it sits there.
Why the monitoring misses it
Inverter and monitoring readouts report totals — a string's output, an array's output. One failed panel inside a large array moves that total by a fraction, well inside the noise of a cloudy week, and a ground walk samples only part of the array even when someone makes the climb. The sweep covers the whole array in one pass, from the air, while the system keeps generating — no shutdowns, no contact with the panels.
When it has to fly
Faults only show their heat when the array is working: the scan flies under load, in good sun. If the day will not produce valid data, we reschedule at no penalty rather than sell you a pretty picture — the same standard we hold a roof scan to.
What it cannot do
Thermal shows heat, and heat is evidence, not a verdict. It tells your electrician exactly where to verify and repair; it does not replace that verification. And some damage — hairline cell cracks, for one — may not throw a heat signature until the degradation is well advanced. What the scan replaces is the hunt: instead of paying a crew to search an array for a loss you can feel on the production report but not find, they start at the marked panels.
What you get
The deliverable is the Array Thermal Health Report, in your hands within 48 hours — panel-level findings, located and annotated, with visible-light imagery of every flagged panel. Ground-mount and rooftop arrays both fly; tell us the array size and location and we confirm coverage before anything is booked.