Just an FYI for anyone wanting to use Tigo optimizers with SMA inverters incorporating AFCI -
According to SMA the Tigo optimizers will not operate with the SMA inverters. They didn't go into detail. They just said the AFCI feature of the Sunny Boy is not compatible with Tigo. After further discussion they acknowledged that disabling the AFCI feature in the Sunny Boy would allow compatibility with the Tigo optimizer. Awesome. After talking this over with Tigo they came to the same conclusion but neither company seemed too happy or confident in the marriage. Awesome. Eric Stikes SunHarvest ----- Original Message ----- Wrenches, Here's an update on this configuration (20kW Enphase, AC coupled to Sunny Islands) you should know about: Enphase will not support and warranty the use of their micro inverters in an AC-coupled installation with battery-based inverters. Enphase approved this verbally with us in design, but balked when we asked them to back it up in writing. Their issue/point is that AC-coupling violates the UL1741 listing. Thus, we're revising the design to use Sunny Boy string inverters. Our customer would still like the module-level monitoring and optimization offered by the micro-inverters (there is some shading issue), so we're considering using string optimizers. We have not used string- optimization, yet. It looks like the leading options are Solar Magic and Tigo. Any preferences, cautions, or advice with choosing and using optimizers would be appreciated. Thanks, -Kelly Kelly Keilwitz, P.E. Principal Whidbey Sun & Wind Renewable Energy Systems NABCEP Certified PV Installer WA Electrical Administrator 987 Wanamaker Rd. Coupeville, WA 98239 kelly at whidbeysunwind.com PH & FAX: 360.678.7131
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