Renewable Energy

December 2023
How to Ensure Safety under UL 3741 - Understanding the Risks and Limitations of Some Solutions Without DC Optimization

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Figure 1. DC-optimized systems allow for two panels to be connected in series, meaning that, upon rapid shutdown initiation, the maximum voltage within the array is 125VDC

The introduction of the UL 3741 Standard for Photovoltaic Hazard Controlin 2020 was hailed as an important milestone in the solar industry’s continuing drive to improve solar system safety. Building on rapid shutdown best practice first introduced in NEC 2014, it was conceived to equip the solar industry with
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