Greetings, I just got the new Elite300 and tried to connect to my RV (Jayco Comet) the light on the rv plug goes on, but the van does not see that it is connected to shore power. Do I need a bonding plug?
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Hi, is your Elite 300 plugged into an actual shore power station and then passing it through to the RV - or is it being used standalone?
To be a little more specific -
Are you connecting the Jayco to a 240VAC outlet of the Elite 300 or are you connecting the Jayco to the 12V-30A RV outlet of the E300?
If it’s the 12/30 DC outlet, you won’t see Grid or Shore power. If it’s the 240VAC outlet of the 300, you should see grid/shore as if you are connected to the Grid.
If the 300 is connected to the grid and the Jayco is connected to the 240VAC outlet of the 300, this is pass thru charging/loads and should still display grid connect on the Jayco BMS display.
No you do not need a bonding plug, however, using a portable RCDO between the 300 and Jayco is safer. If the 300 is plugged into a grid connect, the earth pin will earth thru the 300 to the van and all of its earth connections. If you are off grid and powering the Jayco only from the 300 there is no earth connection, which is where the RCDO comes in. 
From what I’ve found online I believe the Jayco Comets are primarily for the North American market using 110/120 volts.
@Bhart was wise to question whether using a bonding is ok.
From past experience, power station and inverter manufacturers tend to shy away from answering these type of questions - and for valid reasons. Making a blanket statement that bonding plugs are ok opens up situations where someone will leave the bonding plug in and then connect to an already bonded circuit! This is easy to do on the BLUETTI’s because plugging into the grid / shore power will pass on the existing bond. Now you have an unsafe condition.
I can’t speak for the Elite 300 or any other power station, but the following photos demonstrate my Elite 30 running with and without a bonding plug. I’ve inserted an outlet tester to provide a visual.
First photo connected to the grid and no bonding plug!!
Never put bonding plug if connected to the grid!!
Tester displays bonded neutral ground.
Second photo no grid and no bonding plug.
Tester shows open ground condition.
Third photo no grid, with bonding plug.
Outlet tester displays neutral ground bond.
