I can see the redundancy reason. There does not seem to be an economic reason to do this, especially if you are on-grid or already have a suitably sized off-grid or backup system. Just use a regular mini-split seems more logical.
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 Thu, Jun 19, 2025 at 2:35 PM Dave Angelini Offgrid Solar via RE-wrenches <[email protected]> wrote: > The EG4 is not a bad split. Reason my client wanted it was a redundant > cooling back-up if his battery/inverter/solar went down. > Definitely run AC to it from the main system. Getting close to the > solstice and solar can power this well into the evening😎 > > > > *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 2025-06-19 10:53 am, William Miller via RE-wrenches wrote: > > There are two reasons I could see: > > > > · Your existing PV rating is too small. > > · You do not have any existing PV and you do not want to incur > more utility expenses. > > > > I do see a real limitation to direct-DC air conditioning (which I think is > what we are discussing): No AC when the sun is not high in the sky. That > alone makes this impractical > > > > William > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > > > > *From:* RE-wrenches [mailto:[email protected]] *On > Behalf Of *Jason Szumlanski via RE-wrenches > *Sent:* Thursday, June 19, 2025 10:25 AM > *To:* RE-wrenches > *Cc:* Jason Szumlanski > *Subject:* Re: [RE-wrenches] EG4 Mini Split > > > > I guess the secondary question is why would anyone use this system anyway > in a grid interconnected environment. The only rationale I could see is to > have some level of air conditioning when the sun is shining without having > to go through the expense of adding a hybrid inverter and batteries. But by > the time you install solar panels with a rapid shutdown system, the return > on that investment seems terrible considering that much of the solar energy > generated will be wasted unless you somehow need maximum cooling from this > unit 365 days a year during the daylight hours. > > > > > > > > > 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 Thu, Jun 19, 2025, 6:15 AM Jason Szumlanski < > [email protected]> wrote: > > I'm getting requests to install 4-6 panels for these mini-splits. I'm > saying no so far, but it got me thinking... What are people doing for rapid > shutdown for these systems? I can't see them being exempt. The manual is > silent on the issue. It just shows a DC isolator from the panels to the > point of connection in the unit. > > > > Jason Szumlanski > > Florida Solar Design Group > > > > > > _______________________________________________ > 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 > >
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