Rebekah I am not 100% sure but I think that there is often confusion between max fuse and max reverse current. When you list a module you request a fuse rating , in this case 4 A and UL will test it by applying a max reverse current of 1.75(max fuse rating) or 7 Amps with out a fuse to insure that the module does not melt down. Basically they are adding to the fuse rating for a healthy safety factor. The required fuse for this application is of course 4A. I think sometimes manufacturers(marketers) do not understand the difference and like to report the higher number cause it sounds better. I have had heated discussions with module and inverter manufacturers over this in the past. Would be nice if the industry would grow up and report everything the same way or at least the way that make sit clearer for installers and inspectors!
Bill On Mon, Mar 21, 2016 at 3:32 PM, Rebekah Hren <[email protected]> wrote: > Reverse current and max series fuse are not always the same, check out > this Solar Frontier manual, pg 3: > > > http://www.solar-frontier.com/eng/cs/groups/co_en_product/documents/document/mdaw/mdey/~edisp/c012760.pdf > > > Rebekah Hren > > On Mon, Mar 21, 2016 at 3:58 PM, Kristopher Schmid <[email protected] > > wrote: > >> I just did a class exercise using the upcoming sw290 for sizing >> conductors and OCPD and the calculation was such that a 20 amp fuse was >> needed (rounding up from Isc x 1.56). I hope that the maximum reverse >> current on the spec sheet is also the maximum series fuse rating. >> >> Kris >> On Mar 18, 2016 8:56 PM, "jay" <[email protected]> wrote: >> >>> HI All, >>> >>> I was looking at the SW cut sheet. >>> It doesn’t mention series fuse rating. >>> >>> It does mention “maximum reverse current” >>> Is this the same thing? >>> >>> Or where would I find the series fuse rating. >>> >>> thanks >>> >>> jay >>> >>> peltz power >>> >>> _______________________________________________ >>> 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 >>> >>> List-Archive: >>> http://www.mail-archive.com/[email protected]/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: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> >> > > > -- > Tel: 336.266.8800 > NABCEP Certified Solar PV Installation Professional™ 091209-85 > NC Licensed Electrical Contractor > > _______________________________________________ > 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 > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > -- William Hoffer 161 SE Fourth Ave P.O. Box 1823 White Salmon, WA 98672-1823 [email protected] <[email protected]>
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