I think the idea here is that 690.9 allows the inverter output conductors to be sized based on the maximum ampacity and an OCPD is actually not required is the conductor ampacity is sufficient. So in an off-grid scenario, the wires could be as small as #4. In a grid interconnected situation where there is potential pass-through current exceeding the inverter output current, the wire would need to be protected according to the available current on the grid input terminals. If there is a generator, the inverter output circuit would need to be protected based on the generator rating. The fixed 200A rating of the inverter load disconnect is the confusing part. It seems like it would be more functional if it were replaceable with various ratings of main breaker. You need additional circuit protection in most cases unless it's completely off-grid with no generator input it seems.
Jason Szumlanski On Fri, Apr 15, 2022, 8:44 PM Chris Sparadeo <sparadeo.ch...@gmail.com> wrote: > Hi Jason, > > You bring up a valid point….in an off-grid scenario with the 15k do you > size the conductors to the continuous capacity, surge capacity or the OCPD > of the unit? > > -Chris > > On Fri, Apr 15, 2022 at 4:01 PM Jason Szumlanski via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> P.S. ICYMI, this inverter has a massive combined AC coupled and DC >> coupled capacity. They allow 15kWdc plus 19.2kWac!!! Impressive. >> >> >> >> >> >> >> On Fri, Apr 15, 2022 at 10:59 AM Jason Szumlanski < >> ja...@floridasolardesigngroup.com> wrote: >> >>> I'm not following the wiring diagrams for this new inverter. It has 200A >>> pass-through capability with an integrated 200A load disconnect. But then >>> it says the wire gauge for the load out wiring can be #4 to 2/0. >>> >>> In an off-grid scenario where there is no generator, the max continuous >>> output is 62.5A, so I assume 80A circuit protection could be used with 80A >>> rated wire (#4), but how is that circuit protection implemented if the 200A >>> breaker is integrated? Do you have to run a short piece of 2/0 to an >>> external 80A rated OCPD and then step down to #4? >>> >>> Jason Szumlanski >>> >>> >>> >>> >>> >>> _______________________________________________ >> 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 >> >> -- > Chris Sparadeo > > > C_802-369-4458 > H_802-728-3059 >
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