Hi, Ron, Yes, you must be careful of the MPPT inputs. You state Sol-Ark has an 18 amp max input, meaning you can not have more than 1 string supplying an MPPT if your 60 cell modules are 10 amps Isc. You state Sol-Ark has a maximum voltage per MPPT of 500 volts, this voltage is *not Voc x number of modules.* The Voc must be temperature corrected. find the lowest temperature for your region, check code book 690.7a table and there is a table of temperature correction factors, use these factors to correct Voc at STC to Voc at your lowest temperature. For example if your lowest temp is -10 F the code says (x1.2) so your 40 volts becomes 40 x 1.2 = 48 volts and the max number of modules is 10 per string
On Tue, Apr 12, 2022 at 9:42 PM Ron Young via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Hi Wrenches, trying to wrap my head around a first time Sol-Ark install. > Because the max DC voltage is 500v at 18a and the PV I’m using is 40v DC > each I will have to create three strings each 480v. What would be the best > choice for a home run wire? I’ve always used smaller strings with micro > inverters, a combiner at the array and a single Teck home run cable but the > string inverter presents a different scenario and it looks like I’ll need > to use three home run cables, one for each string. > > Ron Young > > earthRight Products - Solareagle.com > Alternative Energy Solutions ~ Renewable Energy Products > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > 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 Pay optional member dues here: http://re-wrenches.org 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 There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ 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
