steam powered subs

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Re: steam powered subs

Postby davidg » Tue Feb 11, 2020 10:37 am

Submarine lead acid batteries are NOT normal lead acid batteries they are specifically designed for the purpose, do not be fooled they are not like the average lead acid cells.

They are designed for extreme abuse and 100% DOD regularly. They will do it for up to 25 years, A lithium cell under the same abuse would not last anything like the same length of time. Weight is not the issue here, after all you want the vessel to be able to submerge.
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Re: steam powered subs

Postby jules » Tue Feb 11, 2020 1:26 pm

Hmm, how would they go in a stand-alone system?
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Re: steam powered subs

Postby davidg » Tue Feb 11, 2020 1:46 pm

jules wrote:Hmm, how would they go in a stand-alone system?


They'd go great, but you and I could NEVER afford them, there designed for the specific purpose, space and incredibly limited in production, remember these are serious full on MIL spec design, ie super expensive.

And of course the final nail, you and I cannot buy them. Exclusively made for the job only.
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Re: steam powered subs

Postby jules » Wed Feb 12, 2020 12:42 pm

Any idea how they achieve regular 100% DOD PLUS a 25 year lifespan?

Lead acids aren't known for combining those qualities but if there was any way to get closer than std solar lead-acids do, it would be a big plus for them relative to Lithium.

I've always managed to get long life out of lead-acid batteries but only by using very shallow discharges.
Primary system: .8KW Trina panels; Plasmatronics PL40; 1,000Ah VRLA 12X2V battery bank; 1.7KW Selectronic inverter. Off grid for 30 years.

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Re: steam powered subs

Postby Warpspeed » Thu Feb 13, 2020 9:48 am

Lead acid telephone exchange batteries are expected to last at least 25 years, and do so easily.
Its not rocket science, the batteries are very carefully and lovingly maintained, never over charged or over discharged, or abused in any way.
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Re: steam powered subs

Postby jules » Thu Feb 13, 2020 10:26 am

I quite agree :D

I suspect that most of the time when people have issue with lead-acid batteries it's simply because they haven't been "very carefully and lovingly maintained, never over charged or over discharged, or abused in any way.

I retired my last set with 35 years behind them and even then, the problem was not the plates but the plastic cases, some of which developed cracks ... not surprising at that age, even though they had been protected from nasty light.
Primary system: .8KW Trina panels; Plasmatronics PL40; 1,000Ah VRLA 12X2V battery bank; 1.7KW Selectronic inverter. Off grid for 30 years.

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