In summary: my MPPTs are dropping out of network mode and going into standalone mode and I don't know why.
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The past couple days have been sunny so I turned off the grid 'mains' to check out the solar side of system in preparation for some upgrades later this month and I've noticed a behavior which I can't explain.
![](/storage/attachments/1901-vecanshunt.png)
Normal operation (full power coming from MPPTs):
![](/storage/attachments/1904-inessmode.png)
![](/storage/attachments/1903-outessmode.png)
Normal operation (in ESS mode):
![](/storage/attachments/1898-essmode.png)
![](/storage/attachments/1896-standalonemode.png)
I've completely power cycled the MPPTs, disconnecting from PV, and disconnecting from DC, waited a bit, then connected back to DC, then supplied power via PV.
Basically, I can't explain why the system would it drop out of the network status ESS into standalone, (drop out of slave mode into standalone mode)?
Unless maybe I have a bad RJ45 UTB cable as well?
Here are some of my other settings.
![](/storage/attachments/1899-dvccsvs.png)
Both MPPTs are connected via Ve.Direct to the CCGX and over Bluetooth to the Smart Battery Sense on the batteries.
![](/storage/attachments/1900-mpptconnected.png)
If I observe the LEDs on each of the MPPTs, I see that they primarily stay in Bulk, though occasionally the blue Bulk LED flashes off, then back on.
But after a minute or so, seeming at the same interval that they drop out of ESS, they go into float, if only for a brief second, then back to bulk again.
You can see from the VRM output for today, that each MPPT controller is behaving nearly the same. I would expect to see these lines to be a curve of constant output, vs the spikes & dips.
![](/storage/attachments/1913-outputjumping.png)
Additionally, if I watch the volts at the shunt.
When the system goes into 'standalone/float', the volts drop to 13.07v
Any help or advice or places to look would be appreciated.
Thanks,
Nate