If I understood you correctly, this would fall under grid-connected
houses that I mentioned in the last example. This was the specific
reason why I think namespace tagging seems to be clearer. The house
would then be tagged with:
building <https://wiki.openstreetmap.org/wiki/Key:building>=house
<https://wiki.openstreetmap.org/wiki/Tag:building%3Dhouse>
electricity <https://wiki.openstreetmap.org/wiki/Key:electricity>=yes
electricity:generator
<https://wiki.openstreetmap.org/wiki/Key:electricity>=yes
electricity:grid <https://wiki.openstreetmap.org/wiki/Key:electricity>=yes
electricity:generator:origin
<https://wiki.openstreetmap.org/w/index.php?title=Key:electricity:generator:origin&action=edit&redlink=1>=solar
electricity:access <https://wiki.openstreetmap.org/wiki/Key:electricity>=no
By tagging both electricity:grid=yes and electricity:generator=yes this
specifies that the building is connected to both and both are routinely
used. In contrast, it would also be possible to tag
electricity:generator=backup if the generator is only on when the grid
fails.
Is this what you meant by grid-tie?
Regards, Luke
On 11.11.20 21:49, stevea wrote:
I hope this doesn't throw too much additional confusion into electricity:grid, but in many parts of
the world (including where I am, California) a frequent method for connecting solar panels to both
one's house / commercial building and the grid is to do what is known as "grid-tie,"
sometimes called "net metering."
Grid-tie means that during sunshine, the solar panels generate and "spin the electric meter
backwards" (creating a credit to the customer with the electric company) and at night, when electricity
use / loads create a debit (by drawing power directly from the grid / electric company), the meter
"spins forward" as usual during power use. Of course, the idea is that generation and load balance
each other out during a billing cycle and this "net metering" nets out to about zero, so the
customer has a near-zero bill.
That is prevalent enough in the world that if OSM is going to design a tag for electricity:grid, it
really needs a syntactic accommodation for "grid_tie" or "net_metering" (which
are essentially the same). Especially as I'm not sure if this would go under electricity or
electricity:source (which introduce at the same time), I haven't any specific suggestion on a key,
tag or namespace, but I think it important to mention what I haven't seen in this discussion.
SteveA
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