I may be wrong, but I was under the impression that most inverter/chargers are either being an inverter or a charger at any given time, but not both. So, once the inverter sees the AC voltage from the generator, then it will switch to being a charger and use the generator AC power to charge the batteries and run the loads. So it will never be passing through generator power and supplying power from the batteries/PV at the same time. I would think that with a call to Sol-Ark you should be able to verify this for sure, unless someone else here can verify.
But also, I would size the conductors for 1.25 * available amps, since it could be continuous. So you might be able to get away with 62.5 * 4 * 1.25 = 313A rated conductors. Cheers, Dave On Tue, Mar 26, 2024 at 5:28 PM Jason Szumlanski via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > I am going to have a quad-stack of Sol-Ark 15K for an off-grid 120/240V > system with a 150A generator. I know the max real power is 62.5A each > inverter including battery and PV. That would be 62.5A x 4 = 250A total. I > intend to connect the output of the 4 inverters together with a 5-port > Polaris tap, with the output of the Polaris Tap going to a 400A main lug > only panelboard. > > My question revolves around the 200A passthrough capability for the > generator, which is 150A max output and would be connected to the Grid > input on each inverter. Since each inverter would need to handle the full > pass-through current, that would require minimum 150A conductors on the > input side of each inverter. I am under the impression that the inverters > can supplement the "grid" or generator in this case if the current exceeds > the available input. That means the inverter would have 150A of input plus > 62.5A of inverter power for a total of 212.5A. But there is a 200A load > OCPD, so I could size the load conductors from each inverter for 200A. > > Obviously the 4 inverters can only pass through 150A from the generator in > total, which would probably be split among them, but could go through a > single unit if the rest fail. > > Now, is it possible for each inverter to output 62.5A each PLUS 150A of > generator power spread across them for a total of 400A? That is important > because I would need to size the combined output conductors for 400A if > that is the case. > > I guess I'm not clear on how Sol-Ark 15K handles grid/generator > assist/supplement. It does not seem to be documented clearly. > > Jason Szumlanski > Florida Solar Design Group > > > _______________________________________________ > 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 > > -- [image: Logo] <https://www.sungineersolar.com/> Dave Tedeyan, P.E. Owner | Sungineer Solar p: he | him | his a: 1653 Slaterville Rd. | Ithaca, NY 14850 w: www.sungineersolar.com <http://www.sungineersolar.com/> c: (607) 270-0370
_______________________________________________ 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
