In the analysis that follows, it is assumed that dc bus losses from the rectenna to the inverters are a part of the rectenna system. In addition, the substations located at points 1 through 5 in Figure 9-21 will be defined largely by individual site and specific transmission systems. Accordingly, these costs are not included. The overall efficiency of an inverter for the proposed application is difficult to estimate at this time. Figure 9-22 tabulates the probable losses, using what can be considered the lowest achievable values for each identified loss. Achieving these in an actual system will require a significant development program. Figure 9-22. Estimated dc-ac Interface Losses ROM costs for the dc-ac interface equipment has been developed in three steps. First, the basis cost of 1 kW inverter is estimated and then a learning curve applied for the total system cost. Secondly, the power distribution system, consisting principally of the 5 MW feeders have been estimated, and thirdly, the results of steps 1 and 2 have been combined for the total system cost.
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