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

Wed May 14 15:22:52 PDT 2025

I attached a screenshot of my app showing the range up to 100%.

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, 5:57 PM Steve Higgins <steve at surrette.com> wrote:

> 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>
> <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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> 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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>>> privileged material. Any unauthorized review, distribution or other use of
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