Steve, thanks for the call. I am using voltages, rather than SOC to start/stop the generator. I also just reduced the battery resistance to 0 based on your recommendation.
Jay, There is a temp sensor. The batteries only got to about 32deg C after 14 hours of charging. I got the 7 hours of absorb time based on the equation capacity*.42/charge current. 890AH*.42/50A = ~7.5 hours (I used 50A rather than 75A, since I figured it would be unlikely that the solar would often be able to sustain 75A for very long) The 5% is not adjustable. I think the adjustment is in the battery capacity. Steve just corrected me on this though, as he mentioned it is actually 2%. Cheers, Dave On Fri, Oct 4, 2024 at 11:01 AM Jay <jay.pe...@gmail.com> wrote: > Hi Dave > > I bet there is no way to install a temp sensor? > > Question about the 7 hrs absorb time. Where did you come up with that > figure. > > Is the 5% adjustable or the adjustment is in the battery capacity? > > Thx > Jay > > > > On Oct 4, 2024, at 8:30 AM, Dave Tedeyan via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > > > Hi All, > > I have inherited and done some work on an off-grid system with a Sol-Ark > 8k inverter and now has a new set of 16 Rolls S6 L16-HC batteries (only > about a month old). There is only 3.9kw of solar, and there is a 12kw > generator. > > First of all, thanks to Steve for putting out that webinar a little while > ago on how to program a Sol-Ark with lead acid batteries! I followed that > for the programming of this inverter. > > Recently, the generator kicked on when it should. But it never turned > itself off. I had to go into the battery settings and turn off grid and gen > charging to get the generator to turn off. From looking at the monitoring, > even once the batteries were full, they were still accepting over 40A of > current. A few hours later, the batteries were accepting almost 50A of > current. > > The battery bank has a capacity of 890AH, but based on the FLA > recommendations I set the capacity to 70% of that, or 650AH so that it > absorbs longer. Based on the Sol-Ark programming, it will run the generator > until the batteries are accepting 5% of that, or 32.5A. It seems that since > the system never got down to that little amount of current, it never turned > off the generator and never stopped charging. I had the customer check the > water level and they said it was low, but not below the level of the > plates. > > Does anyone know why the batteries might have been accepting so much > current even when fully charged? And in order to get the final amps that > the inverter is looking for to turn off the generator, I would need to set > the capacity up to about 780AH or about 90% of the rated capacity. Is > upping the capacity the recommended action to prevent this from happening > in the future? > > I also have a follow up question. Being that there is not a ton of solar > here, the recommendation for a full absorb every few days ends up being > about 7 hours of absorb time. I am wondering if there is a way to force the > inverter to do an EQ cycle (although we are really just using the EQ > function on the inverter to get a full absorb cycle every few days) when we > know it will be a sunny day? I would also like to be able to start an EQ > cycle and also start the generator to give a good top off. It seems that > you can choose the EQ frequency, but you don't know exactly when it will > try to EQ. > > Thanks in advance! > Cheers, > Dave > -- > > [image: Logo] <https://www.sungineersolar.com/> > Dave Tedeyan, P.E. > Owner | Sungineer Solar > p: he | him | his > a: 1653 Slaterville Rd. | Ithaca, NY 14850 > w: www.sungineersolar.com <http://www.sungineersolar.com/> > c: (607) 270-0370 > _______________________________________________ > 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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