Sol Ark is adding an end amps (return amps) timer so you can control when the inverter transitions from absorb to float. The problem now is that it is limited to 2% of the programmed or calculated battery capacity for 10 minutes. Once the new firmware is released, it'll be 2% for up to 4 hours. This does not mean you shouldn't still use the EQ cycles (Programmed to Absorb Voltages and Times) to ensure a full 100% charge. Using only end amps to charge a lead battery of any type is generally a bad idea. End Amp or Return Amp settings were designed to ensure that a fully charged battery didn't get overcharged.
Another issue is the battery's internal resistance, which can cause issues with FLA, AGM, or GEL batteries. If the internal resistance is higher than expected, the inverter will slightly increase the battery voltage to increase the current flow. If you are dealing with an already hot battery, this may cause the batteries to overvolt and swell up, especially if they are already hot while undercharge. <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> Steve Higgins ⋅ Technical Services Manager t +1.902.597.4020 m +1.206.790.5840 f +1.902.597.8447 e st...@surrette.com <http://www.facebook.com/RollsBattery> <https://www.youtube.com/user/RollsBattery> <https://www.youtube.com/RollsBatteryEngineering> <https://www.youtube.com/RollsBatteryEngineering> <https://www.youtube.com/RollsBatteryEngineering> <https://www.linkedin.com/company/rolls-battery-engineering> <https://www.linkedin.com/company/rolls-battery-engineering> <https://www.linkedin.com/company/rolls-battery-engineering> <http://www.instagram.com/RollsBattery> <http://www.instagram.com/RollsBattery> ------------------------------ CONFIDENTIALITY: The information transmitted herein is intended only for the addressee and may contain confidential, proprietary and/or privileged material. Any unauthorized review, distribution or other use of or the taking of any action in reliance upon this information is prohibited. If you receive this email in error, please contact the sender and delete or destroy this message and all copies. ------------------------------ On Fri, Oct 4, 2024 at 8:11 AM Dave Tedeyan via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > 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 >> >> _______________________________________________ > 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. 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_______________________________________________ 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
