--- On Sat, 2/13/10, Jim Rudholm <jimrudholm@gmail.com> wrote:
From: Jim Rudholm <jimrudholm@gmail.com>
Subject: Re: [PSUBS-MAILIST] Re: K-350 / AGM batteries
To: personal_submersibles@psubs.org
Date: Saturday, February 13, 2010, 6:52 PM
One of the golf cart battery dealers locally said that the 12v.
designs do not hold up like the 6 and 8 volt because of the thinner
plates.
Jim************************************************************************
On Sat, Feb 13, 2010 at 9:29 AM, <ShellyDalg@aol.com> wrote:
> I have read the different specs on batteries and I know the AGM's are the
> most recommended.
> There are quite a few things to consider for sure.
> I have a question about charge cycles.
> In applications such as ours, a golf cart seems the closest match in usage,
> where the system is charged at night and then receives a relatively deep
> discharge during the day.
> From my reading the various battery sites, it seems the lead plate's
> thickness has an impact on how many charge/discharge cycles a particular
> battery will withstand before it goes to hell.
> Most golf carts use 6 volt batteries in series, and the plates are thicker
> than the ones in 12 volt batteries.
> Now I realize these are all wet cell batteries.
> The thicker plates in a 6 volt battery are apparently able to withstand more
> deep discharge cycles than the thinner 12 volt plates. The overall size of
> the batteries is close to the same but the 6 volt with only 3 cells has
> bigger cells, I assume because the plates are thicker.
> I've seen some battery manufacturers claim up to 700 cycles, while others
> don't have a set number of cycles published.
> AGM's have advantages as far a spilling, out gassing, and maybe reduced
> charge times.
> I'm wondering how many cycles can be reasonably expected, provided the
> batteries aren't abused by discharging them too low during any one dive.
> Frank D.
>
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