View live power data over bluetooth from a Junctek battery monitor and the M4860N MPPT solar charger (may work with others as well).
Supported battery monitor models are KH110F, KH140F, and KH160F.
The app lets you graph power data in real time as well as view daily energy output history of the solar charger.
The app is released under the GPL v3. No location permission or internet permissions required.
You can clone it build it from source or download a pre-packaged version from the link above.
It is also available from frdroid.
Thanks for looking!