Add growatt battery devices

[indykoning]

Proposed change

This PR aims to add battery sensor information to the Growatt server integration. This has been tested on my Home assistant instance with two accounts:

• One with my own "Plant" with just two inverters
• One with the "Plant" of someone nice enough to hand me their login with just one battery

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml
sensor:
  - platform: growatt_server
    username: GROWATT_SERVER_USERNAME
    password: GROWATT_SERVER_PASSWORD

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

[Hedda]

FYI, you should not use the term "Storage devices" for batteries because "storage device" most commonly refers to a "data storage device":

https://en.wikipedia.org/w/index.php?title=Data_storage_device

I believe that the correct terminology is "energy storage" or "home energy storage" as a general term for any type of energy storing devices:

https://en.wikipedia.org/wiki/Energy_storage

If always specifically only batteries then it technically is "Electrochemical energy storage" where products are today commercially commonly referred to as "Battery Energy Storage System" (or "BESS" for short).

https://en.wikipedia.org/wiki/Home_energy_storage

Other very common "energy storage" devices for private homes are accumulator which usually store energy as heat (normally hot water), like a hot water storage tank:

https://en.wikipedia.org/wiki/Accumulator_(energy)

https://en.wikipedia.org/wiki/Hot_water_storage_tank

Commercial buildings take accumulators to the next-level, storing both heat and cold, few private homes do that but see: https://www.youtube.com/watch?v=N3Em64OBGqI

[indykoning]

That is fair enough, it can be confusing if context is not clear. I will change the title and description of this PR once i have the time.

in code and in context of Growatt and their API it may be more clear to use storage since that is what their actual api endpoints are called: https://github.com/indykoning/PyPi_GrowattServer/blob/1fa78f2b332f41ecaa9f66065f7617e6b3cb8a2f/growattServer/__init__.py#L119 see newStorageApi, getStorageParams and storageId.

[stale]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days.
Thank you for your contributions.

[MartinHjelmare]

Good!

[MartinHjelmare]

Please solve the merge conflict.

[MartinHjelmare]

Thanks!

[indykoning]

There were some issues caused by the merge, it should be fine now :)
I have tested the latest changes on my own HA instance on 0.111

[MartinHjelmare]

Requesting changes to mark the correct status. See above.

[MartinHjelmare]

Thanks!