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Graham
You should be able to drive an externally regulated 110 amp 12 volt alternator off each engine with one belt and existing hanger. Assuming current setup has one alternator for engine starts and other for house batteries tie them together with a ACR or DC - DC charger. Leece Neville or Prestolite alternators are my favorites in this single belt amperage range.
For us normal cruisers with twins the above setup is simple and dependable. Any solar you hook up can easily be accommodated. One’s cruising style plays a big role in your onboard charging requirements.
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