Pounding waves and off-grid isolation demand a different class of power — marine and recreational batteries combine massive starting power with deep-cycle endurance.
Cranking amps to turn over a heavy inboard engine, plus the reserve capacity to run electronics for hours.
House-bank solutions in AGM or LiFePO4 to run refrigeration and inverters far longer.
For marine, Raya Energy lists 6 matching ZITEX batteries in Flooded lead-acid, Enhanced Flooded Battery, group sizes 4D, 8D — including 4D-150-Z, 4D-180-Z.