A power conversion system for use with a photovoltaic power source may include a DCDC converter for converting a first DC voltage into a second DC voltage, an isolation transformer, an inverter for converting DC power to AC power, and at least one controller for controlling the DCDC converter and the inverter. The present invention allows prospective buyers of goods and services to communicate a binding purchase offer globally to potential sellers, for sellers conveniently to search for relevant buyer purchase offers, and for sellers potentially to bind a buyer to a contract based on the buyer’s purchase offer. Thus, the entity can be retained in the present status or transferred to a previous status in the workflow.