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You can use tagtot function to get total.
Find the totalized value (time integral) of an attribute's values over a specified time range, optionally converting the totalized value from its current unit of measure (UOM) to a specified UOM in same class.
TagTot(attname, starttime, endtime [, toUnit] [, pctgood])
I believe tagtot function plus roll up can achieve what you want.
For more information about tagtot, you can find it from
PI System Explorer > Help > Help topic > Asset Analytics > Expression functions reference
Adding if you want to get the results at 7:30, then periodic scheduling can be used.
In that case, still it is possible to specify specific time within the tagtot function. (tagtot's starttime and endtime)