Help Needed: Simulating Dual Lead-Acid Batteries in Fire Vehicle Context

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Hi, I am trying to simulate an experiment using PyBaMM for two Enhanced Flooded Batteries (lead-acid batteries, each 12V) connected in series, with only limited information available (initial capacity = 170 Ah, CCA = 1000A, and cut-off voltage = 10.5V). The goal is to generate a dataset including time, voltage, current, resistance, temperature, SOC, and potentially SOH.

The experiment is complex due to its context: fire vehicles. These vehicles are never at rest. When parked at the station, the battery is powered by a 230V supply (resulting in a voltage of about 26.5V). When the vehicle is on the move, the battery is charged by the alternator (voltage rises to about 28V). Consumers are always drawing power from the battery. At the station, the load is relatively small, but during operations, more devices are active. The exact current draw is unknown.

I have limited knowledge about batteries but need to generate a dataset for experimental purposes to perform a data analysis assignment.

Currently, I am encountering infeasibilities and unrealistic values. Is it possible to create an experiment within this context? If so, how should I approach and execute this?