Thanks MikeD
Forgot to add that we already have a Sterling external regulator with a temperature sensor. The alternator failures have been quickly following the engagement of the DC to DC charger. Possibly just a few seconds after engagement, hardly time for the temperature to rise much?
It might be an idea to have a secondary temperature sensor to instantly disable the charger.
If we also consider the possibility of a heavily depleted starter battery, requiring an assist from a “charge pack”, the starter battery itself could demand a very high initial current. Much more than the 10A as above.
I read that the recommended maximum current for long continuous use (such as on a yacht on a calm day) was 50% of it’s maximum rating.
But yes, reducing the input/output current to the charger would be a good start point, keeping a close eye on the alternator’s temperature.