I forgot to mention, I suspect that the Insight configuration might be overriding changes I made with the SCP. I'm going to try to change the nominal voltage with the local Insight interface today.
I still don't understand why the XWs are reporting the fault. Maybe that's just the way the Xanbus network works - any MPPT can report to the XW that the DC bus is high. Jason On Tue, Jan 13, 2026, 7:29 AM Jason Szumlanski < [email protected]> wrote: > I have a new client with an existing Schneider dual XW Pro system with > four MPPT 100 and two MPPT 60 charge controllers. They have a SCP, AGS, and > Insight. > > The system is reporting DC over voltage faults on the two inverters > (viewable via SCP. The battery voltage is not high. It's a bank of EG4 LL > batteries that would hit their high battery cutoff well before the XW > detects a high battery condition. > > I went through all of the setting and discovered that the two MPPT 60 were > set to a nominal voltage of 36V. I fixed that by changing them to 48V and > cleared the faults and all was well. I did this though the SCP. > > By the time I came home, however, the faults returned and the MPPT 60 both > reverted to 36V nominal. > > I'm not sure why the DC over voltage faults are showing up on the XWs, but > it seems related to the nominal voltage issue on the MPPT 60s. > > Any ideas? > > Schneider tech support has me wasting time today going for a boat ride to > the site to put a meter on the battery terminals, when I know it's > obviously not an actual battery voltage issue. I'm hoping to steer them in > a different direction. > > > Jason Szumlanski > Florida Solar Design Group > >
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