Generated for an actual member system in Calabasas (shared with permission, name withheld). Every member gets one of these every year, and this is what "we found a problem" looks like when it costs you $0.
Your system produced 15,815 kWh over the last 12 months, roughly $5,500 of electricity value. Measured against what a system of your size, orientation, and location should generate, your array is on target. Seasonal output follows the expected curve (peaking near 1,800 kWh in July, bottoming near 790 kWh in December), and year-over-year comparison shows no degradation: this spring came in slightly above last spring (April +3.5%, May +0.9%, June −1.4%).
Your panels face three directions, so each is judged against neighbors facing the same way, the honest comparison. June 2026, per panel (kWh):
Percentages are relative to the median of each panel's own array (same orientation). Panel-level output naturally varies ±5%; the flagged units fall outside that band.
| Location | vs. same-facing peers | Most likely cause |
|---|---|---|
| West array, bottom-left panel | −23% (56.7 vs ~73.5) | Beyond normal shading variance; persistent across months, hardware suspect |
| South array, two bottom-edge panels | −13% (58.1, 59.5) | Edge position, likely partial shading; confirming |
| East array, top panel | −12% (55.9) | Edge position, likely partial shading; confirming |
Together these gaps are worth roughly $130/year in lost production today. The South and East stragglers are probably benign. The West panel is the one that matters, and here's what we're doing about it:
The West-array panel is a genuine concern, so we are formally documenting it as of this report. This report and the underlying production logs are now on file as evidence. Your Enphase IQ8+ microinverters carry a 25-year manufacturer warranty, a weak unit is replaced at no equipment cost, but only when the case is documented and filed. That's our job, and the clock has started: