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StefaE / PVForecast

Forecasts to optimize electricity consumption for rooftop PV (photo-voltaic) installations
GNU General Public License v3.0
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Using pvlib / mosmix for an enphase-array setup #21

Closed olikra closed 11 months ago

olikra commented 11 months ago

Hi Stefan,

thanks for this repo. It's one of the clearest implementations bringing mosmix and pvlib together, Helped me a lot.

I try to setup this system for following use case (which differs a bit from "normal" pv-systems): My sister will get an enphase-system. In enphase each module has his own inverter. So we get installed 26 modules with 26 individual inverters. These 26 modules will be arranged (the roof is a little bit labyrinthine) in following way:

Arrays: EAST: 8 modules/inverters WEST1: 2 modules/inverters SOUTH1: 2 modules/inverters SOUTH2:6 modules/inverters WEST2: 8 modules/inverters

In a normal setup this would be arranged by strings to inverter and pvlib can handle it.

What is the best way to handle the 26 indivdual module/inverters? Simulate each module/inverter by an individual run (so 26 loops with individual azimuths/tilts? update: Or calculating one module/inverter per array (tilt is the same in the array) and multiplying the result by number of module/invert in the specific array Thanks upfront.

StefaE commented 11 months ago

Hi Olikra,

you can define split array configurations. PVForecast then makes a forecast for each split and sums them up to a total.

Whether I'd define 26 splits, I doubt - but probably five for the five arrays you list (or potentially even average out WEST1/WEST2 and SOUTH1/SOUTH2, depending how different they are ...

Not sure why you split SOUTH and WEST ... it could be because of shading. Unfortunately, pvlib has no easy way (afaik) to convey shading information from any sort of horizon information ... so you'd in this case overestimate production. (pvlib has an open issue on this)

olikra commented 11 months ago

@StefaE The split results out of the planned mounting of the panels by the installer. Having different array-split-setups inside enphases system and "my" forecasting is not the best to get it in sync. I can change the panel/array/azimuth at any time. But this should get synced in Enphse and "my" system.