If the sun is shining and the power being produced is consumed immediately (i.e., the power output from the PV array is directly feeding the loads rather than passing through the multimode inverter to charge the ESS) an ac-coupled system architecture will be more efficient than its dc counterpart. Interactive inverters tend to be more efficient than multimode inverters. To achieve this, an additional multimode inverter is required. This means that the power must be converted to dc before charging the ESS, and any power output from the ESS must be converted once again to ac. In other words, the output from the PV modules is fed through an interactive inverter before it reaches the ESS. In an ac coupled system, power from the PV modules is converted to ac prior to connecting to the ESS.
The ac-dc distinction has major system design implications. In contrast, battery cells must be charged with dc and will output dc power. That power must be converted to ac to be used in most commercial and residential applications.
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