I think the answers you want might be in this document. See Page 5. https://knowledge-center.solaredge.com/sites/kc/files/se_3p_system_design_and_nec.pdf
(this document addresses 3-phase design, but it is still applicable) Jason Szumlanski Principal Solar Designer | Florida Solar Design Group NABCEP Certified Solar Professional (PVIP) Florida State Certified Solar Contractor CVC56956 Florida Certified Electrical Contractor EC13013208 On Tue, Aug 13, 2024 at 3:18 PM Mick Abraham via RE-wrenches < [email protected]> wrote: > Hi, Wrench List colleagues~ I have a minor dispute with a technician at > one of the solar superstores. He says the amp rating on SolarEdge > optimizers needs a 25% "safety factor". > > SolarEdge's spec sheet says "Maximum Output Current" for model S500 is 15 > amps. I'm not sure if the technician would take 25% off the 15a or if he > boosts the Isc amps (on the PV datasheet) by 25%. In one case, his > allowable short circuit amps (from the datasheet) would be 11.25a and in > the other case it's 12a. > > If he's right, this "500 watt optimizer" could only process 500 watts in > an unusual combination of Vmp and Imp. I know the PV's open circuit voltage > should be calculated higher based on the lowest possible cell temperature, > but I can't find any SolarEdge reference materials that address the > amperage. I checked the SolarEdge videos, installation documents, and I > even spent time in voicemail perdition. Their design tool at > designer.solaredge.com did suggest the S500 optimizer after I entered all > the parameters for my preferred module. > > Nothing else from SolarEdge so far...so it's Wrenchie time. It would be > especially helpful if someone has a white paper or other document to clear > this up. I'm pretty sure the technician wrong on this point, but I'd like > to offer more than just my opinion. BTW, the PV's that I'd like to use are > 450 watt monocrystalline, two strings of 54 cells and 14.55 amps short > circuit current. The relatively low cell count does translate into higher > amps per rated watt compared to a module with more cells in series. > > Thanks as always; the Wrench List is the Bomb! > > Mick Abraham, Proprietor > www.abrahamsolar.com > > Landline: 970-731-4675 > Cell phone or for text messaging: 970-946-6584 > ᐧ > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 Pay optional member dues here: http://re-wrenches.org 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
