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Hi
All the information that can be provided is just shots in the dark without more information.
The Cobra specs indicate the unit is 110 / 120 V output.
You say you wired the inverter direct to the trailer. Assuming the trailer to require a 50 amp service then how about telling us what wires you wired direct?
I would avoid wiring direct and try using the power cord provided with the trailer and whatever adapters require to get it plugged into one of the 15 amp receptacles on the front of the Cobra.
Then try running the cobra without plugging the power cord into the trailer.
If this proves good then turn off all breakers and the battery isolation switch if the trailer has one. Plug the power cord into the trailer and try the Cobra.
If you follow this suggestion please let us know what happens
I have one in my truck to charge computer and drill batteries. This is not an exceptional powerful unit and will not support much and probably wouldn’t run the 55 Amp converter the trailer specs call for.
Phil P
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