[RE-wrenches] EG4, SRNE. "All In One" Inverters.

Wed May 14 14:57:39 PDT 2025

Maybe they changed it... But in off-grid mode, the Auto Genstart would
start at X SOC and then stop at 80%...

As for Lithiums, only 80%... YES, you are correct, being able to get to
100% every so often will help with balancing individual modules.   On ours,
we typically advise 20-30 mins per parallel module for the absorb timer to
allow for the BMS's to balance each module.

With LFP's (At least ours), we would like to see people get them to full
100% at least once a month...

<http://www.rollsbattery.com> <http://www.rollsbattery.com>
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<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 steve at surrette.com
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On Wed, May 14, 2025 at 2:52 PM Jason Szumlanski via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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 at 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 steve at 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>
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