Bil wrote in news:3ebvo1lujj9hblfr8iu9g5aefpolvle9ea@
4ax.com:

250 Amps of nominal 14VDC

What Ampere-Hour batteries are you charging with this much current, and
not boiling them? Will the boat float that much battery weight?

Some day Roger will design us a hull with "battery ballast" built into
the keel, instead of the dead weigh that's down there, now. The "battery
ballast" will be 5000 AH of specially-shaped cells to make the keel
shape. All the thousands of pounds of weight will double as keel
deadweight for sailing. As this special keel is where the batteries are
located, all the space they're hogging in the boat, now, will be freed up
for useful living space and storage.

The "battery ballast" will be removable when the boat is hauled for easy
replacement when you go to paint the bottom. They might bolt to either
side of a narrow keel with a skid shoe for grounding under the "ballast
batteries" without damaging them. A protective forefoot along the front
of such a keel across the bow end of them would also help protect them.

Being naturally water cooled along their long sides, amazing charging and
discharge currents could be shoved through them without overheating, like
batteries in the bilge would cooled by air.

I think this would be a great use for the AGM maintenance-free wetcell
technology of today......and the Toshiba 60-second-recharging Lithium-Ion
cells that electric auto industry will be using in the future.....

How 'bout it, Roger? Good idea?