Its very simplistic
e.g. its currently 2030, and I have 15hrs until my batteries reach 10%
and not even:
its currenty 2030, and it will be 1130 when the batteries reach 10%
however, using a little logic, you can then based on the forecast sun (which rises at 0800) and the forecast production you can determine a REAL time to go.
This is the bit I spend some time working out, to have it on a dashboard would be amazing.
Its an off grid thing