[RE-wrenches] Midnite AIO Battery Low/Lost Behavior

Tue Jul 15 18:22:05 PDT 2025

Generally speaking, with these respective AIO inverters, where is the
supposed SOC being calculated from and how often is that source manually or
auto calibrated?

I only have experience in AIOs with Fortress inverters and their evault
batteries. I had a situation where the house went dark when closed-loop SOC
read 35%.

Some may remember from this forum, Fortress confirmed battery volts had to
go above 55v to auto recalibrate. It was a Vermont mid-winter and the
customer never turned on the genny because he thought the bats were safely
at 35%., Actually they were close to 0% due to the lack of winter
recalibration.

On Tue, Jul 15, 2025 at 8:56 PM Lou Russo via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> We definitely experience that. Mostly with Sol-Ark and Homegrid. Generator
> even starts but it is not quick enough to do anything. Have the client
> power cycle and everything is fine. Had this happen last week, batteries
> were at 79%.
>
> Aloha,
> Lou Russo
> Spree Solar Systems LLC
> C-34322
>
>
>
> On Tue, Jul 15, 2025 at 1:44 PM Howie Michaelson via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> These are useful suggestions for how to deal with low battery conditions,
>> however I understand Jason's situation to be a hardware or firmware issue -
>> the inverter temporarily reads battery voltage or SOC as 0% and shuts off,
>> needing manual intervention to turn back on.  I'm not sure if i am having
>> the same issue on at least a couple of sites with an AIO and 1 or 2 PF16s
>> in closed loop, by I've seen the inverters without warning seemingly loose
>> the batteries (which are in a relatively high SOC  - 70-80%), see no SOC,
>> then shut itself off.  So far the client has gotten the inverter back to on
>> by shutting it down entirely and restarting it.  It fires back up and
>> operates fine as though nothing has happened.  Anyone else experiencing
>> that?
>> Howie
>> Sun Catcher
>>
>> On Tue, Jul 15, 2025, 6:43 PM William Miller via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> Friends:
>>>
>>> Could one set the inverter LBCO slightly above the battery LBCO?  The
>>> inverter is controlling the shut down and the battery does not go into
>>> alarm.
>>>
>>>
>>> William Miller
>>> Miller Solar.com
>>> 805-438-5600
>>> www.millersolar.com
>>>
>>>
>>> On Tue, Jul 15, 2025 at 2:26 PM Jay via RE-wrenches <
>>> re-wrenches at lists.re-wrenches.org> wrote:
>>>
>>>> I can’t agree more that auto restart is a requirement.
>>>> A well designed system that has the inverter shut off( shut down or not
>>>> sure what the correct term is) due to low battery should restart in the
>>>> morning.
>>>>
>>>> Now I could easily see that it will have to get to some X amount of SOC
>>>> or volts or watts of input before it connects the AC loads.
>>>>
>>>> Jay
>>>>
>>>>
>>>>
>>>> On Jul 15, 2025, at 3:21 PM, Chris Schaefer via RE-wrenches <
>>>> re-wrenches at lists.re-wrenches.org> wrote:
>>>>
>>>> 
>>>> Mr. Bryce,
>>>>
>>>> As offgrid is our biggest piece of the pie, I too would like to have
>>>> the AIO power back up when voltage is at an acceptable level just as our
>>>> OB's, Magnum's and Xantrex's have been for years. My hope is that in the
>>>> very near future a firmware upgrade would make this a selectable feature.
>>>>
>>>> Much appreciated,
>>>> Christopher
>>>>
>>>> On Tue, Jul 15, 2025 at 4:35 PM William Bryce via RE-wrenches <
>>>> re-wrenches at lists.re-wrenches.org> wrote:
>>>>
>>>>> Is this closed loop or open loop?  If closed loop the "rules" require
>>>>> the machine to stay shutdown until the "issue" is identified.
>>>>>
>>>>> On Tue, Jul 15, 2025 at 8:04 AM Tyrone Houck via RE-wrenches <
>>>>> re-wrenches at lists.re-wrenches.org> wrote:
>>>>>
>>>>>> That's my understanding as well. Sure would be cool if there was an
>>>>>> automatic reconnect mode that could be set.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Tue, Jul 15, 2025, 7:56 AM Jason Szumlanski via RE-wrenches <
>>>>>> re-wrenches at lists.re-wrenches.org> wrote:
>>>>>>
>>>>>>> With this new breed of AIO inverters, when the battery reaches low
>>>>>>> voltage disconnect, do they all need manual intervention to restart
>>>>>>> inverting?
>>>>>>>
>>>>>>> I'm having an issue with a Midnite AIO with a stack of Pytes
>>>>>>> batteries that reset themselves for a yet undiagnosed reason. The DC
>>>>>>> Battery voltage goes to zero on the inverter for a moment, and then
>>>>>>> returns. The problem is, it requires manual intervention to push the button
>>>>>>> to turn the inverter back on. It does not happen automatically. That's not
>>>>>>> good for an unmanned remote site.
>>>>>>>
>>>>>>> Jason Szumlanski
>>>>>>> Florida Solar Design Group
>>>>>>>
>>>>>>>
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>>>>
>>>> --
>>>>
>>>> Chris Schaefer’s
>>>>
>>>>
>>>> *Tel 585-229-2083 or Cell 585-748-1870 *
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>>>>
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