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Solar modules deployed in France in 1992 still provide 75.9% of original output power (www.pv-magazine.com)

submitted 2 months ago by [email protected] to c/[email protected]

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[–] [email protected] 8 points 2 months ago (1 children)

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.

[–] [email protected] 7 points 2 months ago (2 children)

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.

[–] [email protected] 2 points 2 months ago (1 children)

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.

[–] [email protected] 3 points 2 months ago* (last edited 2 months ago)

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.

[–] [email protected] 2 points 2 months ago (1 children)

Dan you sound like a rad dude ad I'd love to have a beer with you

[–] [email protected] 1 points 2 months ago (1 children)

Hah, thanks (if you're serious)! Feel free to DM me if you're ever in the San Francisco Bay Area.