Proceed with caution, feel free to contact me off list. On Tue, Feb 18, 2025 at 5:36 PM Jason Szumlanski via RE-wrenches < [email protected]> wrote:
> 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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