Rob, What you are looking for is commonly used on boats and RVs. Google "marine battery disconnect relay" or "RV battery disconnect relay." The relay can be mounted close to the battery and controlled by a switch in the driver's compartment. The main thing is to keep the main thing the main thing. Do the best you can with what your have where you are. Have fun today! SOBill Rob, What you are looking for is commonly used on boats and RVs. Google "marine battery disconnect relay" or "RV battery disconnect relay." The relay can be mounted close to the battery and controlled by a switch in the driver's compartment. The main thing is to keep the main thing the main thing. Do the best you can with what your have where you are. Have fun today! SOBill