[RE-wrenches] Midnite AIO Battery Low/Lost Behavior
Jason Szumlanski
jason at floridasolardesigngroup.com
Wed Jul 16 11:41:28 PDT 2025
In open loop there is no cable between the batteries and the inverter, but the
batteries are connected together and communicating with each other. I am certain
it is a battery issue because the leader battery will fault out, and then the
whole stack comes back to life automatically. I have been working with Pytes on
this issue.
There are no loads large enough at this site to overwhelm the inverter. In fact,
it typically bounces from 50W - 500W all day and night when the home is
unoccupied.
So I know it's a battery 0V issue that is causing the inverter to turn off.
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, Jul 16, 2025 at 2:36 PM jay <jay.peltz at gmail.com> wrote:
> I think you said you’ve tried it open and closed loop same issue.
> In the open loop are the batteries connected via comm cables between the
> batteries?
> and do you know if they are connected together via comms does that mean they
> will all shut down if one shuts down?
>
>
> And you’re sure it’s not some weird load that is shutting the inverter off?
>
>
> jay
>
>
>
>
>
>
>
>
>
>
> > On Jul 16, 2025, at 12:29 PM, Jason Szumlanski <jason@
> > floridasolardesigngroup.com [jason at floridasolardesigngroup.com]> wrote:
> >
> > Midnite AIO with 8 x Pytes 48100R E-Box.
> >
> >
> > 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
> >
> >
> > [data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=3D]
> > On Wed, Jul 16, 2025 at 8:36 AM Jay via RE-wrenches <re-wrenches at lists.re-
> > wrenches.org [re-wrenches at lists.re-wrenches.org]> wrote:
> >
> > > Jason can you remind us what equipment is being used?
> > >
> > >
> > > Jay
> > >
> > >
> > >
> > > > On Jul 16, 2025, at 5:21 AM, Jason Szumlanski via RE-wrenches
> > > > <re-wrenches at lists.re-wrenches.org [re-wrenches at lists.re-wrenches.org]>
> > > > wrote:
> > >
> > > >
> > > > This particular system is open loop at this time (which we set to try to
> > > > diagnose the battery random shutdown issue) but the same thing was
> > > > happening in closed loop (Pytes E-Box).
> > > >
> > > >
> > > > Am off-grid firmware is exactly what we need here. Customers "upgrading"
> > > > from old Trace SW inverters or others are actually getting a downgrade
> > > > in terms of autonomy. These new systems need babysitting.
> > > >
> > > >
> > > > 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 Tue, Jul 15, 2025 at 9:04 PM William Bryce via RE-wrenches
> > > > <re-wrenches at lists.re-wrenches.org [re-wrenches at lists.re-wrenches.org]>
> > > > wrote:
> > > >
> > > > > MNP has a plan for a “off grid” firmware specification, that will
> > > > > mirror the old UL1741 that was found in the old SW inverters. This
> > > > > will be under the Grid Tab, and will remove all the ESS requirements.
> > > > > MNP does not have firm timeline for this, but it is on the near term
> > > > > list.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > On Tue, Jul 15, 2025 at 2:26 PM Jay via RE-wrenches
> > > > > <re-wrenches at lists.re-wrenches.org [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
> > > > > > > [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
> > > > > > > [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
> > > > > > > > [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
> > > > > > > > > [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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