[Tagging] How to tag a floating solar farm?

[德泉 談]

 Warin wrote:
>> But if there is only 1 PV panel osm object in the plant, it's not possible to use 
>> power=plant + power=generator on a same object. Is it appropriate to create 
>> a relation with only one element?
> Err the wiki https://wiki.openstreetmap.org/wiki/Tag:power%3Dgenerator says ... 
> small independent generators (such as domestic solar panels), especially those 
> generating less than 1 MW, should not be tagged as a power plant. This is known 
> as distributed generation. 
Sorry I didn't say it clearly.
I know that many users including me would map hundreds of adjacent PV panelsas a single OSM area. It won't be ambiguous at cases on the ground because 
we can draw the boundary of a power plant like the wiki example:https://www.openstreetmap.org/#map=16/43.2724/6.0215


Greg Troxel wrote:
> Sure, but the the OP is talking about 500k panels which is 10 MW if they
> are 200W panels, and or course more if more.  Definitely feels like
> power=genarator, rather than DG.
Actually my case consists 350W/each module, 181 MW total peak power, 
and the size is 175 ha. It is easily found on the Bing aerial imagehttps://www.bing.com/maps/?v=2&cp=24.120074~120.424741&style=h&lvl=15
And it is obvious to divide those into 4 separate district but a mapper just 
drew a single area in OSM.
I tried to draw a sketch to clarify between ground and floating power plant.
https://i.imgur.com/9nGdDX5.jpg

> FWIW, I'd split power=generator vs DG not strictly on size but on
> whether it's just panels on an existing building to integrate, vs
> something purpose installed just for power.  There's a site near me
> which is probably not a full MW, but it's a lot of panels in a field,
> with no associated other buildings or use, and it was put in for the
> sole purpose of power generation.  It might be 0.5 MW, or 0.2 MW, but
> definitely vastly more than the usual 10 kW class home DG, or even 100
> kW DG on a commercial building.
IMHO, I don't like to describe whether a solar installation a power plant or 
not by peak power but output voltage. It depends on how those inverter 
connect to the power gird https://en.wikipedia.org/wiki/Solar_inverter
I've ever seen a 5 MW solar rooftop on giant factory not far from my home. 
That should not be seen as a solar farm (as I think).


St Niklass <st.niklass at live.nl> wrote: 
> Have a look here https://www.openstreetmap.org/#map=16/52.5440/6.1499> Just tag the solar screens seperatly if you you like inside an landuse:industrial area and ad all the > components / parts or islands with a multypolygone. 
I don't like this practice the way someone mapped this object because it 
broke the water body of a lake. How it been rendered is a technical problem 
fixed in a technical way. Other map style not using the plant feature would 
see a strange hole inside a lake?
Tan
    在 2021年8月19日 星期四 下午08:33:47 [GMT+8]， Martin Koppenhoefer<dieterdreist at gmail.com> 寫道：  
 
 

sent from a phone

> On 19 Aug 2021, at 13:51, Greg Troxel <gdt at lexort.com> wrote:
> FWIW, I'd split power=generator vs DG not strictly on size but on
> whether it's just panels on an existing building to integrate, vs
> something purpose installed just for power.  


sounds like a good idea. Maybe we can amend the wiki? 


Cheers Martin 

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