question

Please post a screen shot of Victron connect for each charger when in this condition.

Here they are

I would verify that the battery settings, including expert mode, for each controller are identical, excluding max charge current. I have 3 parallel Morningstar TriStar MPPT controllers that don't always agree on the charge state. As a test you could swap the panels between chargers and see if the issue moves to the other controller.

Odd. Battery settings in both MPPTs are needed. Is anything else in the network?

Does the 50A have LH/terminals?

If the settings are the same, probably a controller fault.

All settings (other than charge current) in the 2 controllers are identical, first thing I checked and have checked several times.

I'll swap the panels over and see what happens. 30a has 2 panels in series, 50a has 4 panels in series parallel, can't see that that would make a difference as when controller fails to charge it always has adequate voltage at the input.

There is a shunt also in the network with a battery temp sensor.

Don't think 50a has LH terminals (automated switchable terminals I presume?), just standard unit as it came.

Can't see how it can be a fault with the controller itself as it works fine as long as it's not in the network, if it does fail then taking it out of the network will start it charging. Interestingly when it fails, the networking tab in Victron connect tells me that everything is in range and it's synchronising charging.

Could it be something to do with the master / slave between the 2 controllers? Maybe if voltages at inputs of the 2 controllers at sun up are just right (or wrong) then the master decides not to switch the slave on. The fact that the user has no knowledge of or control over which is operating as master doesn't help!

Either way all evidence seems to point to it being a network issue.

@martin555 @Stonge @kevgermany

I've the same problem here. I've installed two MPPTs (150/60 and 100/50). The problem just occurs on the 100/50. I saw the problem last year in september and also yesterday. In September I was in the bluetooth range to the mppt and with deactivating and activating the charger within the VictronConnect app, I could fix the issue. Yesterday I just saw the issue in the VRM portal. I've attached also some screenshots. As you see in the screenshots, there seems to be a network issue, because when the 100/50 is faulty, the network power is 0W.

Just an additional information. I've updated my MPPT with the current firmware (bluetooth and "normal"), but the same issue happened a few days later again.