Ed,
Never under estimate an engineers ability to add complexity!
What is wrong with the simple notion of % full and capacity total in MW and storage ratio?!?! Completely agnostic to the storage device characteristics!!!
If I know the storage is 60% full and has a total capacity of 100 MW - and a default ratio of power to storage of 4:1 then I know I can push 40 x 4 = 160 MW at the device to fill it. Plus if device is sending out updating in intervals - I might send it 100MW - then it says it is 85% full - so I adjust accordingly.
Once it is full it sends "Stop!" - simple!
If you want to get clever on your backend systems - you may track actual storage ratio achieved compared to default - or the device can adjust that itself.
Thanks, DW
