Multipluss shuts down after 2 minutes every time on load

I bought a van secondhand and it his a multiplus 3,000 w inverter.
I installed a new 1500 watt electric water heater. Every time it will run the heater great for exactly 2 minutes and then it will shut it off and do it all over again.
I have run the heater independently on AC power and it works great and draws about $1,400 watts and I have checked the wattage draw at the outlet in the van and it shows the same. The system monitor also agrees with the wattage. So this is less than half the continuous wattage my system is rated for but for some reason like clockwork it will shut off after 2 minutes.

I tried some other high wattage items that draw about the same amount of power in the exact same things happened. It shut off after 2 minutes. I monitored the batteries and they maintain the constant 12.6 volts. I have four battleborn lithiums. All connections are excellent and wires are of appropriate size.

Is there some sort of strange failsafe setting within the inverter I need to modify? The over draw light never comes on or anything.
Thanks

What batteries do you have exactly (datasheet)?
The MultiPlus should show with a red LED why it turned off.

Agreed, it never shows overload or any error. 4x Battle born. In the connect app voltage never gets below 12.1 while running the load and it just shuts off.

What batteries do you have exactly (datasheet)?
Chemistry? Capacity?

They are battleborn x4 100ah (I think) lithium. All will appropriate working and tonight connections. All clean. 70f temps. The voltage never dropped.

Do your alarm logs offer any clue by chance?

Have you checked the low voltage disconnect in veconfigure?

Hi,
I have the same problem.
Overload errors on a multiplus2 24/3000 when a load of 750W goes on.
AGM batteries.
Dont see a voltage drop under 24 Volt.
VeConfigure alarm settings: 21,8 V.
VeConfigure shut down settings: 18,6 V.

What can be the reason for overload errors?

I talked to victron support and they think maybe the batteries are cutting out with their internal management, but I find that pretty suspicious when their voltage is so good

No logs or error