I've been making gutter bus wireways that run the length of batteries and inverters allowing for exact lengths of cables. I think I posted a picture of an exceptionally large one. 24' long. I'm looking at the rack mounted set up because the bussing and cabling is done. 3 racks of 6 5kwhr batteries. All I will need is cabling from the racks to a small (in size) bussbar
On Mon, Sep 18, 2023 at 3:50 PM Jay <[email protected]> wrote: > Sounds like a good design. > > > As a tangent question to 13 parallel batteries, such as you’ll need > Michael. > > How are people wiring larger numbers of lithium batteries together in > parallel? > > Massive buss bars which I’m not sure how to do in a code compliance way. > Or > Not worrying about different cable lengths? > Or > Adding another conductor to the farthest batteries to compensate for VD > Or > Making all the cables the same length? > > Thx > > Jay > > > > > > > > > > > > > On Sep 18, 2023, at 4:37 PM, Michael Morningstar via RE-wrenches < > [email protected]> wrote: > > > 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 < > [email protected]> 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 < >> [email protected]> 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 < >> [email protected]> 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 >>> >>> [email protected] >>> >>> >>> _______________________________________________ >>> 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 >> >> _______________________________________________ >> 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 >> >> > > -- > > Michael Morningstar > > > Morningstar Electric > > PO Box 1494 > > Mount Shasta, CA 96067 > > 530-921-0560 > > [email protected] > > > _______________________________________________ > 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 > > -- Michael Morningstar Morningstar Electric PO Box 1494 Mount Shasta, CA 96067 530-921-0560 [email protected]
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