[RE-wrenches] Outback VFX battery voltage sensor error

[Zeke Yewdall]

I've got a system that is throwing occasional battery voltage sensor errors
and shutting down, then turning back on when the error clears a few seconds
to a minute later. Stacked system, two VFX3524's, two FM60's, 600AH of LFP
batteries (EG4 LL rackmounts) in open loop.  It tends to do this when the
batteries are full with lots of sun out.

I am not 100% sure that the batteries are happy -- it's possible that the
BMS's are shutting off charging, and that's causing a spike in the bus
voltage the inverters are seeing. But if that's so, I don't see anything
recording it.  Charge controllers both report 28.2 volts as highest voltage
for the day.  I adjusted the absorb voltage and time down a little bit --
we had set it up a few months ago at 28.2 for 2 hours to try to get the
batteries to balance better, but I took it down to 28.0 for 1 hour now.
Float was at 27.1, I reduced it to 27.0.

But, could this be an actual problem with the inverters?  Or likely still a
programming issue?

Z
-- 
Zeke Yewdall
PV Engineer
NABCEP #031508-89
zeke at darkforestsolar.com
303-523-3592
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