I am considering buying one of these for a road trip I am planning this Winter: https://www.amazon.com/gp/product/B07LF6P8D3 It looks like it draws around 20 amps. I assume that would come from the Tesla's 12V battery. Will that be a problem? I am unclear on how the Tesla 12V battery is charged. Is it charged while driving, or only when the main battery is charging? I have seen references to the 12V battery being "deep cycled" which indicates to me that it is only charged when it is pretty much depleted. It would be a real bummer if using such a kettle resulted in a dead 12V battery!