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Natural circulation (no pump) is tough to establish and maintain. You need a large height difference between the heat sink (oil cooler) and the heat source (the controller) and the heat sink needs to be higher. You'd need to mount the cooler on your roof. Even if you can get that height differential, you need some an upward slope directly from the heat source and a downward slope directly from the heat sink to get it started and that is difficult in a calm system. Driving around makes it more difficult. Also, even if you do get natural circulation, the temperature difference between the source and sink tend to be high which means your controller will maintain a much higher temperature than if it was forced convection.
I'd put a small pump in the path and put a temperature sensor that only turns on the pump when the controller gets too warm under high load. Water cooling will be far more effective than air cooling. I'd be concerned that the controller would overheat powering that land rover around with just air cooling.
I'd put a small pump in the path and put a temperature sensor that only turns on the pump when the controller gets too warm under high load. Water cooling will be far more effective than air cooling. I'd be concerned that the controller would overheat powering that land rover around with just air cooling.