I think that AGM batteries are fine for powering a bow thruster. Two reasons:
As far as I have been able to determine, there is no difference between starting and deep cycle AGMs unlike FLA batteries.
Bow thruster use is a bit like starting and a bit like deep cycle.
Thus AGMs are perfect aside from the cost.
Look at Yandina's web site for ideas on how to charge your 24V batteries with 12V power.
David
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