I agree with the MLPE concept. It is safer, period. There are no high voltage ground faults, series or parallel.
Fire danger is significantly reduced from just a single module. The danger to firefighters is almost 0 with MLPE. Probably greater danger slipping on them than shock. But other advantages are as we go faster ( hopefully) with installs they have to be safer for less educated/trained installers. People working on a roof long after it’s been installed. Etc. micros for example are totally plug and play. Sure us grey beards can do it, but this product ( solar) needs to be just like every other appliance. Easy, cheap, reliable and safe to replace/install . The issue/hassle with fixing/replacing MLPE under a flush roof array is an issue with installation design. If it’s designed to repair easily it becomes much faster. For example, installing jumpers so the MLPE are all along the edge for easy accessibility without removing modules. Better integration with how they are physically attached to racking would make this easier. I’m thinking 90 degree brackets vs top bolts. I agree they are too expensive and too many issues with communication, they seem to fail too often and all that. But I’m still an advocate for them. Offgrid is a whole other ballgame. And that lack of reliability becomes a massive problem. But just my opinion Jay > On Jan 29, 2021, at 3:29 PM, Dave Angelini Offgrid Solar > <[email protected]> wrote: > > Hi Ben, > > Dave had to go on a service call up into the high county. No cell ! I > expect him back before dark. Probably will get back in the AM > > Thanks, Ingrid > > Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ > e-mail [email protected] > text 209 813 0060 > >> On Fri, 29 Jan 2021 13:32:30 -0800, Dave Angelini Offgrid Solar >> <[email protected]> wrote: >> Hi Sly, >> >> The small part of the industry ( Offgrid ) mostly uses ground mounting >> and is not using MLSD. On some new offgrid homes I use rapid shutdown at >> MPPT level to get the permit if the AHJ can't be reasoned with. The >> Schneider rapid shutdown has a nice 600 vdc disconnect in it, that is >> useful later if the homeowner decides to abandon the extra electronics > that >> can affect reliability. >> >> We also protect the area under and near the modules to guard against a >> rare defect from causing a wildfire. >> >> I would like to hear what Outback is doing for this also from you guys >> please? FRIDAY !!! >> >> >> Dave Angelini Offgrid Solar >> "we go where powerlines don't" >> http://members.sti.net/offgridsolar/ >> e-mail [email protected] >> text 209 813 0060 >> >>> On Fri, 29 Jan 2021 14:09:48 -0500, [email protected] wrote: >>> So far the module level shutdown requirements have been a real blow to >> our >>> industry. The reliability and cost from a maintenance and installation >>> standpoint has been very hit or miss so far. It feels like this >> requirement >>> was rolled out far too quickly without enough forethought to its impact >> on >>> the industry. We are constantly going out and fixing problems with mlsd >>> installed by other contractors. Thankfully the problems have nothing to >> do >>> with the quality of the installations. The problems are almost all due >> to >>> premature failure of the products or some inherent defect in them. This >> is >>> a serious issue costing the industry time and resources and making our >>> installers less safe. It just doesn’t really accomplish the intended >> goal >>> of the requirement. >>> I’m curious how other wrenches are dealing with this issue. I recently >>> became aware of fixMLSD.com which appears to be focused on bringing a >> more >>> sensible approach to this requirement. >>> >>> Your thoughts are appreciated, >>> Sky Sims >>> Https://EcologicalSystems.biz >>> “Just An Old Wrench” >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: [email protected] >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> There are two list archives for searching. When one doesn't work, try >> the >>> other: >>> https://www.mail-archive.com/[email protected]/ >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try > the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. 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