Since I only work with off-grid systems, I find the 690.12 exception starting in NEC 2017 for ground-mounted systems with DC equipment in a separate structure intended only for PV components, is very useful for avoiding expensive, unneeded RSS equipment. Many folks don't like the idea of a battery bank and buzzing equipment and fans in their dwelling anyway, so the "power shed" idea works well, and around here structures 120 square feet and under don't need building permits. I did see one system pass with 3 PV modules on the roof of the power shed, though technically that's not part of the 690.12 exception.
Dan Fink Owner, Buckville Energy Consulting NABCEP Certified PV System Inspector IREC Certified Instructor™ for: ~ PV Installation Professional ~ Small Wind Installer NABCEP Registered Continuing Education Providers d <dan.f...@greendustrialtraining.com>anbo...@gmail.com 970-672-4342
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