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Talfan Stamps avatar image
Talfan Stamps asked

#1 error but no traceable cause

15kVA 3 phase 5kVA multis on v495

CCGX v 2.92

2 x Blue Nova 8kWh + 1 x Blue Nova 4kWh (stable, believe it or not!) Each wired to DC bus.

Virtually offgrid as grid is never present in the day.

Issue takes place in daytime only

System shuts down randomly, after 5 to 10secs it boots up again after throwing #1 device switched off error.

I checked all comms cables with cable tester, no problems

I checked VRM

Loads were half capacity max at any time even hours before the situation, but generally loads were 450W on the Phase that appears to be the one switching off - phase 2 (the middle inverter flashes a light sequence, where the other 2 do not)

Phase 2 gave an overload warning moments before first switch off, power was never higher than 500W at the time and hours in the run up to the issue.


There's no abnormal temperature going on either.


Am totally lost as to what is causing it. System today switched off 8 times in space of 3½ hours.


Help would be much appreciated..

shutdown
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3 Answers
Talfan Stamps avatar image
Talfan Stamps answered ·

I did eventually find the problem, it was intermittent communication wth the battery BMS. It would throw 0% SOC for a moment and then go back to whatever it was actually, say 69%, and the system would shutdown and then reboot, but most often when I would be there to look I would see everything im a normal condition. It was only once the problem got worse that I was able to observe the above situation.


Once I dealt with the problem it went away. What was causing it is another issue altogether.


I am now using a 1000amp shunt with bmv700.

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Trevor Bird avatar image
Trevor Bird answered ·

Hello @Talfan Stamps , you have a difficult one to resolve. If no codes are being shown via the CerboGX on VRM it is difficult to resolve. In order to isolate if this is a multiplus fault or a sudden load etc, you could swap two of the Multipluses changing the phase of both. At least then you can see if the fault swaps with the multiplus or stays with the same phase.

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Talfan Stamps avatar image Talfan Stamps commented ·
Thanks for the suggestion. What has been uncovered is a strange report by the bms, also reflected by system 0, where the battery voltage dips way below low cut, yet the vebus and mppts read a constant, good voltage (51v+), so the 1st port of call will be battery side. The issue is not instigated by loading.
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maddin avatar image
maddin answered ·

Hello, same problem with error #1. No other alarms shown in VRM. Setting like same ; 3phase Multi Plus 5000. Batteries SOC 80% .

Checked also cables, connection , updates done.

@Talfan Stamps, do you found a solution ?

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