Don't even get me started on that. I have a library that wants a PV system and batteries just to operate the elevators in the event of an outage. It's 120/208V. We are seriously looking at a Sol-Ark 30K.
On Tue, Feb 18, 2025, 5:27 PM Jerry Shafer <[email protected]> wrote: > Elevators, it's all about the Elevators > > On Tue, Feb 18, 2025, 2:24 PM Jason Szumlanski via RE-wrenches < > [email protected]> 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 <[email protected]> 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 <[email protected]> *On >>> Behalf Of *Jason Szumlanski via RE-wrenches >>> *Sent:* Tuesday, February 18, 2025 5:05 PM >>> *To:* RE-wrenches <[email protected]> >>> *Cc:* Jason Szumlanski <[email protected]> >>> *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 <[email protected]> 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 [email protected] <[email protected]>* >>> >>> *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 <[email protected]> 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 [email protected] <[email protected]>* >>> >>> *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 <[email protected]> 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 [email protected] <[email protected]>* >>> >>> *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 >>> >>> [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. 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