John, Most of my experience is with Lith and NiMH and I am by no means an expert on lead variants- I tip my hat to your theories. I left AGM batteries behind for our portable product the minute we calculated Peukert's share. But in the case of our little Swe Pea that uses cheap 24 group flooded batteries, I was pleasantly surprised to find out that there was still that much usable energy left. Your probably right about the effects of a little recharging and a hybrid solution is pretty nice.
A little side comment about Solar; We're working on a solar recharger for kayaks because of the huge interest. We can size a nice panel system for our product that charges it fully in one day in July in the Pacific Northwest. But in January it takes 10 days to charge. It's dawning on me that there are regionally distinct solutions to the problems we discuss here.
--- In electricboats@yahoogroups.com, "John Green" <v_2jgree@...> wrote:
>
> Joe, due to your business, you would probably know, but I have a feeling that when a battery is pretty dead, the first few minutes charging will really make a radical difference to the power available. So, remembering that I am not hung up on keeping to 'green' charging methods, maybe just a quick run of a gas or diesel gennie could get such a situation turned around. Also, I think that there might be a situation where bubbles on the plates kind of 'insulate' a battery, as I have had some success with cars, by rocking the battery to allow it to bubble up to the top, leaving more plate area wetted. Again, another advantage of electric.
>
> John
>
> I'm following the string where electric out-of power situations could
> arise. I
> have a 36 volt system with a low voltage cutout of 30 volts. We launched one
> time with a destination in mind but found that the battery pack had not been
> recharged since the last outing and we had a low voltage problem when checking
> the gages at the dock. Because of the nature of boats, however, we
> were able to
> travel 4 miles on that dead pack at 3 mph by running at low power. Can't do
> that with an empty diesel tank. It's interesting that the fear of running out
> of charge is so deep-rooted when you can always get more out of a
> battery if you
> just slow down.
>
>
> Food for thought.
>
> --
> Joe Grez, President of PropEle Electric Boat Motors Inc. makers of
> the Electric
> Paddle
> www.electricpaddle.com
> joe@...
> 425-241-9241
> 10404 428 ave se, North Bend Wa, 98045
>
>
> --
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