Wrenches, I don't believe this is a correct use. As was already pointed out, the correct size fuse for those two paralleled strings (assuming 60 cell, 230 or so watt module) would likely be 30 A:
Isc = 8.2 82 A * 2 * 1.56 = 25.6 A = 30 A fuse The max series fuse rating of the module is most likely 15 A. In the setup described below, the remaining four combined strings could certainly feed a fault at above the rating of the panel (15 A) but below the trip rating of the 30 A fuse. These Y type connectors are only good when there are 2 parallel strings TOTAL, or possibly three for certain SunPower or other modules as was pointed out. Cheers, -Nathan >penobscotsolar at midmaine.com penobscotsolar at midmaine.com ><mailto:re-wrenches%40lists.re-wrenches.org?Subject=Re%3A%20%5BRE-wrenches%5D%20MC4%20Y%20Connectors&In-Reply-To=%3Ceddfba3bfc366ba4d3a5ca866c3b6da2.squirrel%40mail.myottmail.com%3E> >Fri Mar 9 11:23:45 PST 2012 > >My whole point is that this method is only good when you are paralleling >two strings, per breaker/fuse, no more. The "Y's" only combine two >strings. That allows an installer to cut in half the amount of >fusible/breakered strings in an installation. If you have 10 strings of >three panels you can parallel two sets of three panel strings five times. >This is an efficient design approach saving both installer time and the >customer money while fully protecting the system. It also makes wire >management much more aesthetically pleasing. > >Daryl -- Nathan J. Stumpff - Actic Sun, LLC [email protected]<mailto:[email protected]> Office: 907/457-1297 Cell: 917/992-7577
_______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
