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Pete ... I cant see why a 10 amp Supply wouldnt be plenty to run the items you have suggested ... You are correct ... ideally the G11 will be better running from 15v but 13.8v and a 10 amp supply would still be adequate.
Different DC Power supplies with their -ve terminals not referenced to each other or ground will vary ... most power supply -ve's will be fine referenced to anothers ... the PD of each will still be the same ... (Be warned though that there are some supplies that may not be able to be referenced to another voltage.)
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