It seems that it has only a 6 amp DC to DC charger so will take all day to recharge a battery from running a small fridge overnight and may not fully recharge if not driving long days.  A voltage sensitive relay connected with suitably sized wire would recharge a battery in much less time, being able to take advantage of much higher current available directly from the alternator.
				
			 
			
		 
			
				
			
			
				MY21.5 L405 D350 Vogue SE with 19s.  Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
			
			
		 
	
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