Hi Rob
John (Astronut) powers his dew heaters and fan from 2 12v sla 7.2 amp battery that he places on the base of his Lightbridge so that the whole unit moves together and stays balanced. You might PM him to find out how long he gets out of his setup, and how he has wired it.
He doesn't use Argo Navis so can't help there.
Cheers
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