SMA Sunny Boy Inverter SB7000US-12 Grid-Tie Solar Inverter 7000W Watt UNTESTED. See photos for model specs. The Sunny Boy 7000-US inverter is UL certified and features excellent efficiency. Graduated power classes provide flexibility in system design. Automatic grid voltage detection and an integrated DC disconnect switch simplify installation, ensuring safety as well as saving time. These models feature galvanic isolation and can be used with all types of modules-crystalline as well as thin-film. For countries that require UL certification (UL 1741/IEEE 1547) Optional integrated AFCI functionality meets the requirements of NEC 2011 690.11. 97% peak efficiency OptiCoolT active temperature management system. Once again, we know nothing of the history of this unit. We do not know if it works or not. That is why our asking price is so low. We have no ability to test it. We offer no tech support and want no hassles. Thanks for looking at our. Listing and supporting our small family business!