>> The main essential requirement is that the 24v output converter 
>> must
>> have a fully isolated output

>> As the 12v output is always below the supply range you may wish to
>> consider a buck converter ...

> Hi Russell,
> Surely an oversight but it is worth mentioning that if you use a 
> buck
> converter it will not have an isolated ground.

No. No oversight. I think :-)

Note that I said that the 24v output converter needed to be isolated 
and that the *12V* output could be supplied from a buck converter. 
This is allowed to share ground with the fuel cell.
The 24V output converter needs to be isolated if it is implemented 
with a 12v converter "sitting on top" of the 12v supply.


        RM

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