Can the charger recover a discharged bank while still carrying the signalling load?

This is the specification that separates a signalling charger from a general-purpose one, and it is worth asking explicitly. ARTC requires the charger to supply full load with the batteries removed, and to supply the normal operating load while recharging a fully discharged battery, restoring it to at least 75% of capacity within 10 hours. Also required: the charger or the battery must each be able to be isolated without interrupting the bus-bar supply, and the no-break DC supply must hold not less than 45 V DC on a 50 V nominal system. Ripple is specified at 1% or less.