Re: [PSUBS-MAILIST] battery charge level

[" Dan. H." <jumachine@comcast.net>]

Brian,  This a VERY good question!

I have a sub and don't have a handle on it.  I have a small digital volt 
meter wired in, so I can monitor either of my three battery systems, one 24V 
two 36V.  The voltage varies quite a lot depending on the usage.  After 
using it and when there is no current draw, the voltage keeps climbing back 
up, and what it go up to seems to depend on how long the load had been 
turned off.  I don't find much stability in the voltage.  When the batteries 
are almost totally depleted, there is a noticeable reduction in prop speed, 
but by then there isn't much left.

Just to be safe, my sub is wired where I can switch between the two 36V 
pods.  They are both used during a dive but on always runs out before the 
other. When either runs out, it's time to quit for the day.

The same problem when charging.  It's a guessing game when the batteries are 
totally charged.

If anyone has a way to monitor, I'd be grateful to here it.

Thanks, Dan H.
----- Original Message ----- 
From: "Brian Cox" <ojaivalleybeefarm@dslextreme.com>
To: "Personal_Submersibles@Psubs. Org" <personal_submersibles@psubs.org>
Sent: Monday, October 15, 2007 1:28 AM
Subject: [PSUBS-MAILIST] battery charge level


> Ok, this is a stupid question but it has been bugging me.
>         How do you know how much charge you have in your batteries? 
> Other
> than keeping track of how long you have run your motors how can you tell.
> I know that the wwII subs would have to check the battery acid levels to
> accurately know how much power was in the batteries.  But with the sealed
> AGM or gel batteries you can't measure the acid, and chances are you
> wouldn't be able to anyway in a small sub.
>
> Thanks,
>
> Brian Cox
>
>
>
>
>
>
>
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