<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">So far rapid shutdown has been a nightmare. It\u2019s added a lot of cost for no measurable benefit.<div>Using always off devices like midnight solar and Tigo makes it impossible to test open circuit voltages. Which opens the door to tons of problems when commissioning systems. </div><div>Also we\u2019ve been trying out midnight Solar\u2019s product and have had an absurd failure rate. Which means lots of truck rolls and troubleshooting and system downtime. They send replacement product but they aren\u2019t paying for the lost weeks of productivity.</div><div>We have Tigo product in hand and are deciding which project to try it on. But our big concern about using it is not only the inability to confirm open circuit voltage of the strings but also the way panels bypass if the device doesn\u2019t allow the panel to connect properly. Both of these features are a recipe for problems and potential troubleshooting nightmares. The warranty from Tigo doesn\u2019t cover our expense if the product fails. And that\u2019s really what our reservations about the product boil down to right now. If we\u2019re on a job with 50 units and one fails, the contractor or the homeowner will be the ones eating the expense of finding it and replacing it. There has to be a better option. </div><div><br><div dir="ltr">Sky Sims<div>Https://EcologicalSystems.biz</div></div><div dir="ltr"><br><blockquote type="cite">On Apr 28, 2020, at 7:46 PM, Corey Shalanski <coresolar@gmail.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<div dir="ltr">Now that 690.12 of the <i>NEC</i> 2017 has been in effect for several years, I am curious how designers and installers are meeting the associated requirements with string inverter-based systems (*not* considering microinverters or DC optimizers). I am generally a fan of the KISS principle, and as best I can determine the <i>Tigo</i> TS4-F device is one of the simplest options currently available on the market. What are others finding?<div><br></div><div>I'd love to hear about favored options for complying with rapid shutdown. Any success stories? or better yet, any early failures?</div><div><br></div><div>--</div><div>Corey Shalanski</div><div>Jah Light Solar</div><div>Portland, Jamaica</div></div>
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