MN15-12KW AIO - anyone else with random shutdowns the past few days?

[couchsachraga]

I finally managed to get my old system removed and everything updated for the AIO - nice clean install, but I've had a few teething problems so far that I'm curious if anyone has had as well, or thoughts / advice:
- The system has shut itself down at least once randomly and needed to be power cycled to come back on.  It may have happened again today as I can't check anything remotely right now and the batteries were at 99% last night.  I'll check tomorrow night when I can get back up to the cabin.  I understand from someone else who has one they also had a random shutdown, in their case today.  Nothing in either of the logs.  They are running most recent firmware, I'm not (tomorrow hopefully)
- I've noted the app indicates at 179.6 watt draw even when the breakers are all off.  I've been told the app is buggy and it is really 60-70 typically (spec being 85w) by a tech at Midnite.  Still way more than the Rosie.
- Apparently though the MPPT controllers will wake up for 90v on a string they are "600 volt controllers" and under 250 volts operate at 25% efficiency (ouch!) (info also from Midnite).  I have two strings, one new (255v), and my original (155v)... looks like I'll be adding panels potentially.

I'm mostly curious if anyone has a good read on no-load draw, and if they are experiencing random shutdowns.  The rest above is just to share what I've learned so far after purchasing and installing the unit.

[goldserve]

I have noticed the MPPTs may not be producing as much as an older system when the string voltage is ~270V but I have no concrete data to back this up.

[couchsachraga]

As Logan and a few kind folks at Midnite have pointed out the app isn't giving an accurate representation of the power draw - the app notes 203w when the real draw was around 85w (rms clamp multimeter once I figured out how to use it correctly for DC).

I've now heard it is a 10-15% efficiency reduction vs 75% for lower voltage strings.  I'll be replacing that string regardless I suspect, but hopefully it can help get me through the winter.

The folks at Midnite have been very helpful and patient.  The folks at NAZ have been helpful but as you'd expect aren't as up to speed on the AIO unit - I've learned my lesson to contact Midnite directly.

[Steve777]

I too had an unexplained AIO shutdown a couple of days ago. Just happened to be standing right next to the inverter when it happened, heard a loud relay click and saw "OFF" on the display. Checked the CBs and all seemed good (nothing tripped), so powered it back up with the on/off button. Came back up and was working fine. Nothing in the logs. FWIW, the load power went off while the inverter was down, this wasn't just the inverter going to idle. Have a call into MN support to see if they can find anything more about it.

In terms of reduced power on the MPPTs at lower string voltages, I haven't really seen it. Currently only have my old panels attached, Voc ~220v and Vmp ~180. Overall the power output (at least as reported via the app) is in the ballpark of what I got when these same panels were on a Classic 150 (obviously in a different string configuration). Have not had any really bright days to get a good max number, but for partially cloudy days it seems more or less the same.

[Logan]

If you have a Random shutdown issue please reach out to Logan@midnitesolar.com  with your serial number and your system configuration. This is a extremely rare event and we need more data from customers that experience this issue.

[couchsachraga]

My apologies for the delay in reply - the exceedingly patient Rick has been helping me; with some firmware updates most (potentially all) my issues have been resolved.  I'm confused with some of the current readings I'm seeing since adding 3 more Powerflo5 batteries (6 now in total), but all may be fine.  Our last unexpected shutdown was 3 weeks ago.