Hi Corey - As we've grown, and as our fleet of installed systems has grown, I've become increasingly interested in choosing an inverter solution that shows per-module production data. I realize that you specifically asked not to consider optimizers or microinverters, but I wonder if that will be a losing battle. Module Level Power Electronics (MLPE) are getting more and more reliable, and allow us to see what is actually happening with the system for relatively easy troubleshooting down the road. Simply put, the benefits outweigh the drawbacks, and they are only getting better.
That said, we're seeing some integrators going with the SMA / Tigo route where you can choose the TS4-F rapid-shutdown-only variant of the Tigo unit to reduce cost. You mentioned this. From the cost analysis that I've run, I'm finding the SolarEdge is actually a bit cheaper than the SMA / Tigo TS4-F route, especially when factoring in the long and flexible string designs possible with SolarEdge. It's certainly possible that the KISS route will pay off if one selects the Tigo route, but I think it's really anyone's guess about which MLPE device will last the longest. Then there are AC modules and Enphase type microinverters which are even simpler to design and install with. Anyway, it's a good question about whether there are any other viable solutions to meet NEC 2017 rapid shutdown requirements out there. But I'm afraid that the days of simple DC string based inverter systems are gone. August Luminalt On Tue, Apr 28, 2020 at 4:46 PM Corey Shalanski <coreso...@gmail.com> wrote: > Now that 690.12 of the *NEC* 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 *Tigo* TS4-F device is one of > the simplest options currently available on the market. What are others > finding? > > I'd love to hear about favored options for complying with rapid shutdown. > Any success stories? or better yet, any early failures? > > -- > Corey Shalanski > Jah Light Solar > Portland, Jamaica > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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