[Tagging] Power Storage Proposal (RFC)

[Christian Pietzsch]

Please consider "As a capability among others, it should *not* get a dedicated value on power=* but
on a side key=*." on my previous mail
That's why we now have come to the conclusion that power=storage will only be used on devices
solely used for storing and releasing energy. The whole facilities will still be tagged as
power=plant with the new storage tags added.
 Underground or arctic off-grid facilities may encounter situations were there is no sun nor wind to
be charged and you're forced to come periodically to change the battery.
If they are rechargeable, they would still be used as storage therefore, they don't use energy from
a primary energy source but need to be charge by a generator/grid first. For these cases I
therefore also would use power=storage.
 Defining two different ways to describe batteries based on their capabilities (primary or
secondary) is once again a poor idea: mappers will be confused on which power=* they should choose.
I think we shouldn't let ourselves be put into standstill because we don't have figured out the
best way to tag every niche case possible.
 Agree on that point, split the table between plant and device storage level is a good point.

It's not mandatory to define several key for that. Compatibility with power=plant and
generator/batteries can be handled on values.
I just got an idea how I can handle this in the table. Will be added soon.
 It's not an easy change as generator:type is now pretty well used.

However new keys should be designed with experience in mind and :type should be avoided.
I didn't mean that I wanted to fix it after the proposal process but talk about it further during the process. Once a decision is made, the proposal is quickly changeable to whatever most people favor.
	Many items of proposed table are not batteries
https://wiki.openstreetmap.org/wiki/Proposed_features/Power_storage#Tagging (https://wiki.openstreetmap.org/wiki/Proposed_features/Power_storage#Tagging)

Is that relevant to define a different power=* value for each?

	power=generators are already a very wide an diverse field. I think that's why adding as many storage devices would make things even more cluttered and difficult for people. Even if batteries fit the broad definition we use for generators in the OSM wiki, I think most people wouldn't classify them as such. At least I havn't hear anyone call their Laptop or Phone battery a generator.

	-Christian
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