Elevators, it's all about the Elevators On Tue, Feb 18, 2025, 2:24 PM Jason Szumlanski via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote:
> Yes, but the PV system would need to be split, and inevitably, the balance > of PV and battery assigned to each distribution panel will not match up > well at times. A single battery and a single PV system serving the entire > property is what he really wants. Tesla is not the answer for that today. I > suggested converting the dual 200A service to a single 400A service and > using 4-6 Midnite AIOs, but that would get pretty messy. > > I do like the idea of having two wall connectors for this purpose. That > didn't cross my mind. I could possibly convince him to do a GW3/PW3 system > for one 200A panel and just a Powershare for the other panel (without PV > recharging). It depends on what is on each panel I suppose. The Powershare > is only 110A LRA, so it might not start up larger AC units without soft > start. The whole idea isn't too practical, but he wants to explore all > options. > > Also, as of today, Powershare does not work with the Gateway 3 with > Powerwall 3. They are working on an OTA firmware update to support this. > For now, it's just unidirectional charging from the Wall Connector. You > need the Gateway 3V for Powershare to work, but that does not work with > Powerwall 3, so it's a waiting game. > > Jason Szumlanski > Principal Solar Designer | Florida Solar Design Group > NABCEP Certified Solar Professional (PVIP) > Florida State Certified Solar Contractor CVC56956 > Florida Certified Electrical Contractor EC13013208 > > > On Tue, Feb 18, 2025 at 5:12 PM Matt Partymiller <m...@sesre.com> wrote: > >> Jason, >> >> >> >> Sounds like an interesting market. >> >> >> >> A transfer switch is probably more expensive than two Tesla vehicle >> chargers, one for each system. He just needs to remember which one to plug >> into and you just need to sell at least 4 PW3s, a couple gateways and >> you’re in business…. >> >> >> >> Matt >> >> >> >> >> >> >> >> *From:* RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> *On >> Behalf Of *Jason Szumlanski via RE-wrenches >> *Sent:* Tuesday, February 18, 2025 5:05 PM >> *To:* RE-wrenches <re-wrenches@lists.re-wrenches.org> >> *Cc:* Jason Szumlanski <ja...@floridasolardesigngroup.com> >> *Subject:* Re: [RE-wrenches] Inverter ratings exceeding 25kw fir battery >> backup >> >> >> >> *Caution:* This email originated from outside SES. Do not click links or >> open attachments unless you recognize the sender and know the content is >> safe. >> >> >> >> Not bragging, but many of my clients in this situation are billionaires >> or at least some sizable fraction of that. Naples is a pretty interesting >> place. They are usually not willing to compromise. On the three barrier >> islands where I do off-grid work, it always starts off as a few mini-splits >> and then it ends up being a few mini-splits and a 5-ton central. And then >> they install an electric hot tub unbeknownst to me. And then there are >> three electric golf carts that show up. And how can you enjoy the beach >> with 30 of your favorite friends without a large ice maker (on top of the >> undercabinet unit at the outdoor wetbar)? It never ends. >> >> >> >> For on-grid homes with common 400A service (dual 200A panels) we focus on >> backing up one panel while installing enough PV to cover the total annual >> household usage, which is usually the request we get. They would love to >> back up both panels, but when confronted with the space requirements and >> battery capacity limitations imposed by NFPA 855, the conversation usually >> goes my way. As for the PV portion, we always hear that if they can't cover >> 100%, they don't see the point in doing it. That's why you end up with >> giant PV arrays with battery capacities more typical of a modest home. >> >> >> >> I just spent an hour explaining to a customer with an existing 25kW >> Enphase system why he can't back up two 200A panels with Tesla Powerwall >> 3's (without serious drawbacks associated with splitting the PV and >> battery). He was also under the impression that he could use Powershare >> from his Cybertruck to back up both 200A panels simultaneously, or at least >> switch easily between them (I actually toyed with the idea of a transfer >> switch to accomplish this, but decided to just say no). >> >> >> >> These clients don't hear NO often. On the other hand, they are usually >> very smart and ask good questions. Most of them didn't get rich by accident. >> >> >> Jason Szumlanski >> >> Principal Solar Designer | Florida Solar Design Group >> NABCEP Certified Solar Professional (PVIP) >> Florida State Certified Solar Contractor CVC56956 >> >> Florida Certified Electrical Contractor EC13013208 >> >> >> >> >> >> On Tue, Feb 18, 2025 at 2:38 PM Dave Angelini Offgrid Solar via >> RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote: >> >> Still Jason it seems very crazy! When I do energy for a home in your >> neck, usually offgrid, we use mini-splits and in a large home >> >> like you are referring with the grid, the same thing, use a split for a >> zone, like the kitchen and save all that wasted battery capacity backing up >> the whole home. They may be a bit uncomfortable without the grid but they >> can survive a hurricane outage, >> >> or longer. >> >> >> >> The strategy of not backing up it all does require the people to be >> reasonable and trainable. Very few central air systems are useable without >> spending 10's of thousands more. I think none unless the owner has more >> money than brains. Good for the economy I guess but all that lithium has to >> go to the dump someday. >> >> >> >> Seems alot of lithium is going to the dump with all these companies >> building batteries and then going out of business also. >> >> >> >> Alot of my calls are for systems that the installer has long gone out of >> business. The owner is clueless because they never had >> >> a clue about their power system. No Bueno for sure! Stay Safe ! >> >> >> >> *Dave Angelini Offgrid Solar* >> >> *"we go where powerlines don't"* >> >> * <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ >> <https://offgridsolar1.com/> <http://members.sti.net/offgridsolar/>* >> >> *e-mail offgridso...@sti.net <offgridso...@sti.net>* >> >> *text 209 813 0060* >> >> >> >> On 2025-02-18 9:42 am, Jason Szumlanski via RE-wrenches wrote: >> >> Haha, we would not have the pool heater on a backup system, but many >> times people want a partial home backup system with whole home annual grid >> offset. >> >> >> >> But for practical purposes around here, full-time residents often just >> trade pool heating for air conditioning based on season. If you size a >> backup system for central air conditioning, sometimes it is technically >> possible to heat the pool off-grid in the winter because the house load is >> otherwise a fraction of what it is in the summer months. In the winter, we >> sometimes see batteries full by 9:00 am and a lot of wasted solar energy. >> >> >> >> >> >> >> Jason Szumlanski >> >> Principal Solar Designer | Florida Solar Design Group >> NABCEP Certified Solar Professional (PVIP) >> Florida State Certified Solar Contractor CVC56956 >> >> Florida Certified Electrical Contractor EC13013208 >> >> >> >> On Tue, Feb 18, 2025 at 11:56 AM Dave Angelini Offgrid Solar via >> RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote: >> >> Sure I get how important it is to electrically heat a pool in a power >> outage. 😉 >> >> *Dave An,gelini Offgrid Solar* >> >> *"we go where powerlines don't"* >> >> * <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ >> <https://offgridsolar1.com/> <http://members.sti.net/offgridsolar/>* >> >> *e-mail offgridso...@sti.net <offgridso...@sti.net>* >> >> *text 209 813 0060* >> >> >> >> On 2025-02-18 8:05 am, Jason Szumlanski via RE-wrenches wrote: >> >> There are many 4,000 sq ft pool homes in my area with electric pool >> heating and electric everything else where 25kW would just cover the >> electric bill. Some larger homes around here can definitely require more. >> Florida Power & Light allows up to 50kW on 120/240V split phase service, >> but only if expected production does not exceed an estimated 115% of >> historical annual usage. >> >> >> >> >> Jason Szumlanski >> >> Principal Solar Designer | Florida Solar Design Group >> NABCEP Certified Solar Professional (PVIP) >> Florida State Certified Solar Contractor CVC56956 >> >> Florida Certified Electrical Contractor EC13013208 >> >> >> >> On Mon, Feb 17, 2025 at 12:58 PM Dave Angelini Offgrid Solar via >> RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote: >> >> Why is there a need for more than 25KW for residential please? Just >> curious. In Nevada, 25KW is way into commercial. >> >> >> >> *Dave Angelini Offgrid Solar* >> >> *"we go where powerlines don't"* >> >> * <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ >> <https://offgridsolar1.com/> <http://members.sti.net/offgridsolar/>* >> >> *e-mail offgridso...@sti.net <offgridso...@sti.net>* >> >> *text 209 813 0060* >> >> >> >> On 2025-02-17 9:43 am, Tyrone Houck via RE-wrenches wrote: >> >> Greetings wrenches, >> >> In Pacific Power territory we are coming up against roadblocks with >> regards to whole house battery backup systems with inverter ratings higher >> than 25kw. Even when the generation capacity is below the 25kw residential >> limit, net metering applications are being rejected based on the inverter >> rating.. The inverter rating in these cases is sized to handle the >> customer's existing loads and will never export more than the 25kw limit >> dictated by Oregon PUC. I am drafting a letter to Energy Trust, the state, >> etc. But am curious if anyone else gas had this problem or come up with a >> solution. I would appreciate to hear any experiences or similar >> interactions with PGE or PPL or even how this has worked in other >> jurisdictions, states, etc. Any input or support is greatly appreciated. >> >> >> >> Tyrone Houck >> >> Oregon Solarworks LLC >> >> CCB #204937 LRT #076 >> >> 541-787-1366 >> >> tyr...@oregonsolarworks.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. 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