Since joining in this thread I am wondering if there might be something in the inverter firmware which is inhibiting the PV output, maybe capping the output for some reason? The panels are rated at 180W but I'm sure I have never seen an output higher than 150W. There have been several failures in the 10 years I have had the system but all ok for the last 2 years or so. There is no "automatic" warning system but the software allows me to check the status of each inverter as/when I feel like it! I usually check once a week. Maybe the figures will be of interest to others thinking about which system to use. The unit was replaced under warranty, as they are covered for 25 years! i might have noticed the drop in the whole system output, but I doubt it. Re Jeff - does your micro-inverter setup have a reporting system in case of individual inverter failure? I ask because in theory my system reports such failures, but the one Optimiser failure I have had I found by accident as I logged in to the layout and noticed a blank report on one panel. Given the orientation, I am pleased with the results. Since 2012 the annual totals are as follows: I have a split array of 3kWp facing due East and 1kWp facing due South, both at ~30° with a Solaredge setup of inverter and individual panel Optimisers. In the spirit of hijacking the thread, I was interested by the figures from other 4kWp arrays,especially why Jeff B's seem so low.
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