Hi Drake I will disagree, there have been many roof top fires.
But regardless we have to do these new regulations and I for one welcome the safety. The main issue is accessing the faulty/suspect component under the module possibly requiring removing multiple modules, a slow and expensive process. My technique is to install the MLPE at the edges of the array, using wire extensions. That way at most I have to remove a single module. And Im working on a drop bracket which would allow better cooling and easier access without module removal to the MLPE, greatly reducing time to swap. Jay Peltz Power. > On Apr 29, 2020, at 7:59 AM, drake.chamber...@redwoodalliance.org wrote: > > > Clearly, rapid shutdown increases cost and reduces reliability. Given the > excellent safety record of PV, prior to rapid shutdown being required, it is > unnecessary. The few anecdotal incidents of PV fires were not enough to > justify the requirement, especially on smaller systems. > > According to a friend who worked for a local installation company that went > under, a big part of the reason for their failure was the chronic replacement > of microinverters and optimizers. > > What steps can be taken to create some balance in the rapid shutdown > requirements that are in the NEC? > > > > --- > > > >> On 2020-04-29 07:27, Sky Sims wrote: >> >> So far rapid shutdown has been a nightmare. It's added a lot of cost for no >> measurable benefit. >> 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. >> Also we've been trying out midnight Solar's 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't paying for the lost >> weeks of productivity. >> 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't allow the panel to connect properly. Both of these features are a >> recipe for problems and potential troubleshooting nightmares. The warranty >> from Tigo doesn't cover our expense if the product fails. And that's really >> what our reservations about the product boil down to right now. If we're 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. >> >> Sky Sims >> Https://EcologicalSystems.biz >> >>> On Apr 28, 2020, at 7:46 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 >> >> _______________________________________________ >> 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 >> > _______________________________________________ > 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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