In my Mainship 40SB I had (3) 31 series Lifeline AGMs under the forward berth. The total round trip was 8'. I ran #4/0 wiring to the batteries. In addition I have a Xantrex 40 amp smart charger on it and a pair of #2/0 wires to a BlueSea 500 amp ACR off the starboard motor. I have never run out of thruster power (VETUS). I eventually reduced the battery count to two 31 series AGM Lifelines. I also run the Good 850 Windlass off the same 31 series battery bank located under the front berth. The windlass is powered through #1/0 wiring. Overkill? Perhaps but neither system has ever let me down.
Bill
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