Do you have the 42-48 or the newer 55-48, l have used both in off grid AC Coupled systems with no issues, inverters freq shift and self power down. I did eliminate the battery temp sensor and use a resistor in its place to stabilize the charge rate. Can you again call out the issue you are having with the inverters as this might help answer or at least even resemble issue we might also be seeing. Fun times
On Wed, Mar 27, 2024, 7:14 PM William Miller via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Friends: > > > > Some of you may remember the problems I am having integrating a set of > Fortress batteries with an off-grid Sunny Island/Sunny Boy ac-coupled > system. If not, here > <https://millersolar.com/MillerSolar/case_studies/36_SIFortress/36_SunnyIslandFortressIntegration.html> > is the case study. > > > > The problem has been in abeyance for the last few months because due to > short days and cloudy weather. There has not been enough sunshine to cause > a recurrence. Now that spring has sprung the problem is back. > > > > I did come up with a work-around: I installed a contactor to disconnect > the Sunny Boys whenever the SOC gets to 90%. This works but it does waste > some solar capability. > > > > I have been working with Fortress on the issue. They have been in touch > and have been very generous in offering support and spending time trying to > find a solution. Most important they have admitted the problem exists. > > > > To me this is very refreshing. This makes me want to use more Fortress > products and sing their praises. I think my fellow wrenches would want to > know about this great support when contemplating which battery products to > use, which is the reason for this post. > > > > Below is an excerpt from an email received today from Fortress. > > > > Hi William, > > > > Apologies for the lapse in communication on this subject, we are still > actively working on this case to provide you with a solution. > > > > We have confirmed here in our Lab that the older firmware does not resolve > the issue as you have stated and the engineering and product teams are in > discussions to provide a solution to this battery/inverter compatibility > issue. We will provide updates on a solution as we receive them. I > unfortunately do not have a timeline to provide, but we will have one soon. > > > > Thank you for your patience. > > > > Warm regards, > > Galen Gennaria > > > > I will update the case study when new developments occur. > > > > William > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > > > _______________________________________________ > 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. 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 > >
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