I think whichever system ( Schneider, OB, sol-ark) it has to include closed loop battery communication.
I really want to try the sol-ark but I won’t until they completely fix their small 120v load issue. Jay Peltz Power. > On Mar 3, 2021, at 6:30 AM, Dave Tedeyan <dtede...@taitem.com> wrote: > > > The Radian is also the system that I would typically use in this situation. > Although I am interested what people think about using a Sol-Ark inverter > here. I have not used one yet, but I am interested in the fact that > everything is integrated into one box, the string voltages can be up to 500V, > and also if there is a battery failure at some point they can still run as a > grid tied system. > Cheers, > Dave > > Dave Tedeyan, PE > Senior Engineer | Taitem Engineering, PC > > 110 South Albany Street | Ithaca, NY 14850 > o. 607.277.1118 x121 f. 607.277.2119 > www.taitem.com > > Solar • Sustainability • Energy • Design > Certified B-Corporation since 2013 > > >> On Wed, Mar 3, 2021 at 7:10 AM John Blittersdorf >> <john.blittersd...@gmail.com> wrote: >> William, >> I agree with you with Radian, Fortress and just add a subpanel identical >> to the main grid panel as close possible. Put all critical loads on sub and >> larger loads on grid panel. Being side by side, swapping circuits is easy. >> I also install an iota charger for generator redundancy. OpticRE works great >> for monitoring. >> >> John Blittersdorf >> >>> On Wed, Mar 3, 2021 at 1:19 AM William Miller <will...@millersolar.com> >>> wrote: >>> Friends: >>> >>> >>> >>> I am getting asked more often to provide design for grid-tied battery >>> backup systems. I generally try to talk clients out of battery backup >>> because I have always felt that the grid is the greenest battery and that >>> the grid reliability is better than one might remember. However, with >>> climate change and media attention, the need and market pressure is >>> becoming stronger. >>> >>> >>> >>> I am really interested in what others have created in the way of solutions >>> to this question. I have thought about it a lot. If its ok, I’d like to >>> free-associate about some of my concerns and conclusions then ask if any of >>> you are willing to share your ideas on how best to fill this need. Here >>> goes: >>> >>> >>> >>> I am a firm believer in segregate load delivery for these reasons: >>> >>> 1. To back up an entire grid service you have to, in good conscience, >>> perform a thorough load study and provide enough through-transfer to >>> provide for maximum load conditions during grid up-time. The backup system >>> cannot be a supply bottle-neck. >>> >>> 2. I don’t accept manual load-shedding for one moment. What if the AC >>> and the dryer are running when the grid goes out? The system crashes. >>> >>> 3. In a home with whole-house backup, it is difficult for the consumer to >>> know there is an outage and to conserve. Cellphone notification features >>> are now more common, but cell phone batteries die and phones get left in >>> the other room with the ringer off, so it is possible for homeowners to >>> leave consumptive loads on after the grid goes down. >>> >>> >>> >>> Conclusion: With segregated loads, the transfer, inverter and storage can >>> be scaled down and the reliability increases. Less cost, better >>> performance. >>> >>> >>> >>> So given that the system sizing will be modest, has anyone come up with a >>> reasonable design using standard, grid-sell capable battery inverters? >>> >>> >>> >>> Here is how I am imagining such a system: >>> >>> >>> >>> I see a modest battery system with a 4 to 8 KW inverter, DC coupled PV and >>> a matching no-maintenance battery system. It would have these components: >>> >>> >>> >>> Inverter: Must have a dedicated generator and grid input and good remote >>> monitoring, robust web interface and email notification. Outback Radian. >>> >>> >>> >>> Batteries: Gel or lithium. I have a client that has been grid-floating a >>> set of MK Powered gel batteries since 1999. Or a Blue Planet or Fortress >>> cabineted system. >>> >>> >>> >>> Generator: Small pad-mount natural gas or propane fueled generator or a >>> portable gas powered unit with stabilized gas. If the generator is >>> portable, provide an AC flanged inlet and sturdy cord long enough so >>> generator can be 10 feet from any opening in the home. Provide durable >>> signage on the generator indicating CO safety practices. >>> >>> >>> >>> PV: DC coupled for simplicity. Sized based on annual energy needs, not on >>> critical loads. Grid power is likely to go down in the stormy winter >>> months or smoky fire season, so PV is not a reliable energy source during >>> grid outages. >>> >>> >>> >>> AC Distribution: Segregated loads with at least one commonly used lighting >>> circuit not on the critical loads panel so the homeowner soon realizes the >>> power is out. >>> >>> >>> >>> Unless you are a Tesla dealer, I am sure many of you have gone through the >>> same mental acrobatics trying to figure out the best solution to this >>> design request. I am very interested in what the rest of you may have come >>> up with. >>> >>> >>> >>> Thanks in advance. >>> >>> >>> >>> William Miller >>> >>> >>> >>> Miller Solar >>> >>> 17395 Oak Road, Atascadero, CA 93422 >>> >>> 805-438-5600 >>> >>> www.millersolar.com >>> >>> CA Lic. 773985 >>> >>> >>> >>> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> 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 >> >> 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 > > 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 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
