Looks great. Am I right in thinking that if I feed it from a 12V battery I will only get 12V out, so for 15V I would need to feed 15-18V?
I believe so, yes. You can use Stan’s “optional 12V PSU as a continuous charger for the Dorado. In that scenario the Dorado is charged up to 15Volt even though the PSU is 12V” (quote taken from the manual).