PV, charge controller and an amp hungry kettle?

Quick question relating to new "making camping comfier" project.

Here's the problem...

I have my PV solar panel hooked up to a car battery via a charge controller
rated to a maximum 8A output & I'm running say, a cool box at 4A and some
lights at 4A taking the output of the controller to it's maximum... Can I
connect a 12V kettle rated at 10A directly to the battery posts with croc
clips, bypassing the controller, just whilst the kettle boils?

Is this liable to cause any problems?

Les