Nine-unit expansion can take the platform into a much larger power class, but the design consequences extend far beyond adding inverter kW. Aggregate battery current, PV distribution, AC bus capacity, protection coordination, communications, equipment spacing and service limits all increase with each unit. A HESP 14–18kW three phase hybrid inverter project that may grow later should reserve those resources from the start. Parallel capability is most valuable when it is part of the original system architecture rather than an unplanned add-on.
