Brand new Yamaha EF6300iSDE instant overload (with video)

[Sunking]

Think I know exactly why, and you might feel a little dumb if I am correct.

Real simple set the Voltage Selector Switch on the 6300 to 120 Volt. Right now you have it set to 120/240 which limits current to 20 amps per Leg or 20 amps x 120 volts = 2400 watts, or with both 120 legs 4800 watts at 240 volts (which you do not use). When you switch to 120 volts will make it 40 amps at 120 volts (4800 watts = 120 volts x 40 amps).

Or buy a 240 battery charger to get the full power usage out of the new genny.

[ron_jeremy]

**Apologies in advance for the dumb question(s) -- I am new to the off-grid home**

We have an old Yamaha EF4500iSE that we connect to our inverter (Trace Engineering SW4024) via 3-prong 120V 30A socket in order to charge the batteries that power our house (we live off grid). The unit is approaching the 5000 hour mark so we picked up a brand new slightly more powerful EF6300 and planned on keeping the EF4500 as a spare.

When I connect the inverter to the EF4500 there's a 60 second "handshake" period where nothing happens & no load is put on the generator. After 60 seconds the inverter makes a single mechanical click sound, the light on the inverter goes from flashing to solid, & then power starts being fed to the batteries (generator accepts load -- about 6 - 7 bars on the EF4500).

However, when I plug into the EF6300 it goes into overload pretty much right away as seen in this video:

https://photos.app.goo.gl/ao159PmbRXqCwjHU9

I tried with the 'econo mode' in either the off or on position but it does not help.
I also tried the voltage select switch in either position (120V or 120/240V) but it also made no difference.

I hauled out an even older 4000W generator (some no name thing but too loud to use) & it connects to the inverter & charges the batteries without issue -- just like our aging EF4500.

Any idea why the 6300 is overloading?