Hi Steve, In the Midnite App, I can set the generator stop state of charge at 100%. What do you mean by saying that it stops automatically at 80%?
Also, charging to only 80% IS a problem with some LFP batteries. If they don't get to 100% routinely, the SOC can drift badly. And I have had issues with balancing cells on HomeGrid batteries that don't reach 100%. I was told that this can cause severe cell imbalances, and I have experienced a few battery module faults due to this issue (at least that is what HomGrid is blaming it on). I don't think charging LFP to 80% should be an issue, but in reality, it can be. I thought the BMSs were supposed to handle these issues well, but maybe they just aren't there yet.. 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 Wed, May 14, 2025 at 5:39 PM Steve Higgins via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Hello Wrenches, hope I'm not stirring up a hornets nest here, with all > the talk about EG4 and some of the "All in One" inverters, I thought I > would just mention that after careful review of EG4 and SRNE's manuals, I > wouldn't use thier inverters on any Surrette/Rolls Batteries out there, if > I were involved in the installation, since you cannot control > absorb timers, or control when the inverter/charger transitions from > absorb to float, I would be very hesitant to use these inverters with any > lead battery. Lithium looks to be good, but IMO lead would be a no-go... > > They are not configurable enough to charge most lead-acid batteries > correctly. > I have reached out to both Signature Solar and EG4 regarding this matter, > and to date, the messages sent over the past four months have not been > responded to. I sent them another request today; hopefully, at some > point, I will be able to make contact and work with them to get a solution. > > The Midnite AIO is programmable, but I have concerns about how it shuts > off automatically when the generator is running, specifically when the > State of Charge (SOC) reaches 80%. I have been speaking with Midnite about > allowing the inverter to charge to 100% for this, but I think they are > waiting for more field feedback before making a change. I have suggested > that they set a timer that will go to 80% normally, but 1-2 times a week > it'll take the lead battery to 100%... As you know, this isn't a problem > with LFP or Li-ion... only going to 80% on lead all the time is going to > result in severe capacity losses. > > With Sol Ark, you should contact them and obtain a firmware upgrade that > they have developed for the lead batteries. This will enable you to > control the end amp's time. You should also disable their battery > resistance settings, as these can raise voltage and current when the > battery's internal resistance is too high. This could cause damage to your > sealed batteries, as temperature compensation is not considered. > > > > > <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. 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