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Solar modules deployed in France in 1992 still provide 75.9% of original output power
(www.pv-magazine.com)
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this post was submitted on 07 Jun 2024
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To give you an idea, my 12-panel PV system installed in 2011 has put out 3.5 MWh per year at its peak and now produces between 3.1 and 3.3 MWh yearly, depending on the weather.
It's hard to attribute that just to panel degradation, though. It could be differences in weather (cloudier or snowier this year) for example.
To measure degradation, you'd need to track the peak output of each panel. Enphase microinverters let you get per-panel metrics but I'm not sure which other brands do.
I'm pulling data from my panels into Home Assistant via Enphase's local API (directly from the device), then into VictoriaMetrics (which is similar to Prometheus but with a more efficient file format). I've got per-panel production data at 5 minute granularity from when I installed them until now.
Dan you sound like a rad dude ad I'd love to have a beer with you
Hah, thanks (if you're serious)! Feel free to DM me if you're ever in the San Francisco Bay Area.
Yeah I am. I like self hosting. I might add some friends to my server at some point.
I'm an Aussie living in the USA. I've been living in the US for 11 years but I'm still Aussie at heart. I'm still eligible for .au domains since I'm an Australian citizen.
We’re getting solar installed very soon, with Enphase micro-inverters. This gets me all kinds of excited. I’m stoked to be getting per-panel metrics, and real keen to shove even more metrics into my Home Assistant.
It's an official integration and works really well. https://www.home-assistant.io/integrations/enphase_envoy/
The inverters all use their serial number as their name by default, but I renamed mine based on array and location to be more useful:
If your installer installs the consumption CTs (optional but the good installers usually include them for free), you'll also have data on total power consumption for your house. It works really well with Home Assistant's built-in energy dashboard.