I don't know the B200 electrical system, but have flown two other types commonly used in surveillance and video-relay role. On both types, we operated with the electrical system under continuous load that was higher than the load typically encountered in (say) night IFR flight in icing conditions, but which was still under the certified load limits. On both types electrical anomalies were not uncommon after extended ops, eg alternator imbalances going outside of limits, or popping CBs.
Certification limits are not black and white - they are set at parameters which give a good probability of successful operations in normal circumstances - if you push outside of normal circumstances you increase the chance of failure.