EPEX spot rank 15 min

Hello,
I’m currently working on a 48V battery system for my home. It is working ok so far, I’m using the Spot rank values from 0 to 23 to control the charging and de-charging. My charger is doing 55Amps and I would like to use the 15min resolution of the spot market prize(Tibber contract). Unfortunately the current resolution of the Epex spot rank is 1 hour. Is someone working on a 15min version or has an idea how to do it ?

Matthias