[RE-wrenches] Schneider MPPT Nominal Voltage Won't Stick

[Jason Szumlanski]

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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