Not sure if this helps or confuses things but here's my thoughts
12V at 50A is 600W, that converter claims 92% efficiency which would leave you with about 50W being dissipated as heat.
That being said the marketing material says 92% at nominal load (70A) so your pretty much guaranteed to be less efficient at any other load (higher or lower). If you truly only need 40-50A you might be able to get a bit more efficient by using the smaller one (Orion 24/12-40) which claims 95% efficiency but then you lose the extra capacity if you ever need it and might not gain that much in terms of getting a lower case temperature. Overall buying one rated higher is likely to be less efficient and generate more heat as converters typically have a peak efficiency at the nominal load they as designed for, of course if the case is bigger the heat might dissipate more effectively and end up with a lower temp but you would get the same effect buy strapping a heat sink on the outside of the one you have.
115 doesn't sound that hot to me for a converter putting out 600W of power, so the converter is probably happy not having the fan on.
You could measure the input and output current and voltage and see how efficient it is actually operating right now?
12V at 50A is 600W, that converter claims 92% efficiency which would leave you with about 50W being dissipated as heat.
That being said the marketing material says 92% at nominal load (70A) so your pretty much guaranteed to be less efficient at any other load (higher or lower). If you truly only need 40-50A you might be able to get a bit more efficient by using the smaller one (Orion 24/12-40) which claims 95% efficiency but then you lose the extra capacity if you ever need it and might not gain that much in terms of getting a lower case temperature. Overall buying one rated higher is likely to be less efficient and generate more heat as converters typically have a peak efficiency at the nominal load they as designed for, of course if the case is bigger the heat might dissipate more effectively and end up with a lower temp but you would get the same effect buy strapping a heat sink on the outside of the one you have.
115 doesn't sound that hot to me for a converter putting out 600W of power, so the converter is probably happy not having the fan on.
You could measure the input and output current and voltage and see how efficient it is actually operating right now?