Jay, I'd like to design for 60kw supply and 100kWh battery. I think I'm going to try the Discover rack mount set up rather than AES's and custom bussing. Jason, That's exactly what I was thinking, if I go the Sol-Ark route. Last time I ordered custom panelboards like that, they were six months out.
On Mon, Sep 18, 2023 at 1:18 PM Jay via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > If 40kw is the peak and then there are new added loads, what 50-60kw? > > If it was me I’d be designing the inverters to handle the 50/60 kw with > future expansion capabilities beyond that. > > Then how much kWh of storage are you going to need or maybe are planning > for? > > At some point maybe looking at a larger single inverter with high voltage > battery vs 48v? > I’m not sure if there are any 120/240 versions yet. > > Jay > > > > > > On Sep 18, 2023, at 12:36 PM, Jason Szumlanski via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > > > I like the Sol-Ark idea having had a few dual-unit successes recently. In > terms of combining them, the Sol-ark manual has a good triple unit wiring > diagram on page 53. You would have to use two 400A panelboards with three > 200A breakers for each to follow this diagram. However, I don't see the > point of a combining load center on the load side of the paralleled units. > The Sol-Arks each have a 200A integrated load breaker, so why not just > combine the outputs in a multi-tap connector or busbar? I think there is a > code-compliant way to make that work, but I haven't studied it with three > units. > > I would definitely ditch the SolarEdge inverters and just make it DC > coupled to the Sol-Arks. You don't need these to be a failure point in the > system, and the AC coupling will reduce the energy production in backup > scenarios. > > It sounds like you would have to get the six 200 feeders out of the > meter/main and into a new panelboard on the load side of the Sol-Arks. So > that's another required load center. > > And if money is truly no object, I would consider a manual transfer switch > to bypass the inverters for service. I'm afraid to look up what a 400A DPDT > switch costs. > > > Jason Szumlanski > Principal Solar Designer | Florida Solar Design Group > NABCEP Certified Solar Professional (PVIP) > Florida State Certified Solar Contractor CVC56956 > > > On Mon, Sep 18, 2023 at 1:14 PM Michael Morningstar via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> I've been asked to build a back up system for a grid connected estate. We >> haven't done many of these and I thought it best to ask those who have some >> questions before I go about reinventing the wheel. >> >> Here's the existing infrastructure. >> 1) 400amp Metered Main Distribution Panel with six 200amp feeders to >> various sub-panels on the property >> 2) 400amp ATS and 100kw Kohler rapid response generator >> 3) 20kw ground mount array with (2) SE Inverters located at the array. >> Feeder from array is 1,000 ft to Service. Six years old and wiring is janky. >> 4) Data logging for the last year shows peak demands of almost 40kw. This >> could increase as several of formerly vacant guest residences could be >> occupied. >> >> My go to is almost always Schneider, however in this instance when I >> looked into a quad stack, or more It seems like some type of controller is >> needed to prevent imbalanced current passing through the relays during >> transfer. That left me a bit concerned. Has anyone successfully stacked 4 >> or more XWPROs? >> >> Then there is the matter of AC or DC coupling? I really want no part in >> having anything to do with SE. The inverters are already looking pretty >> weathered taking the brunt of the prevailing winds and storms (they are >> mounted to one of the ground mount poles). Seems like a great waste to pull >> out the 4/0 feeders and replace strings. My other hesitancy with AC >> coupling is that we would lose PV monitoring and control. >> >> I've also considered Sol Ark 15's, like three of them. We've got some SA >> systems under are belt now and the only thing I can say that I like is the >> speed of installation and the 200amp pass through. Other than that, they >> leave me uninspired. One very large system continues to have glitches that >> SA just shrugs their shoulders about. If we were to do three 15's, *what's >> the preferred combining method?* All that I can come up with is a custom >> 400a panelboard w/ three 200a breakers. >> >> Price is not a consideration for this project. The new owners of this >> property (which is plagued with outages) have tasked me with building >> something that is ultra reliable and good take over in a situation where >> the grid is no longer available. >> >> Any suggestions or tips are appreciated. >> >> Michael >> >> -- >> >> Michael Morningstar >> >> >> Morningstar Electric >> >> PO Box 1494 >> >> Mount Shasta, CA 96067 >> >> 530-921-0560 >> >> mjmornings...@gmail.com >> >> >> _______________________________________________ >> 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 > > _______________________________________________ > 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 > > -- Michael Morningstar Morningstar Electric PO Box 1494 Mount Shasta, CA 96067 530-921-0560 mjmornings...@gmail.com
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