[PSUBS-MAILIST] battery compensation

Fri Jan 15 16:15:19 EST 2016

Brian,For what it is worth, Gamma has 8 internal AGM batteries and I have had no issues.  I am using lead acid (wet) golf cart batteries in my deep diver because I have them and crude oil is 30 dollars a barrel ;-)Hank 

    On Friday, January 15, 2016 1:47 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 I am not sure Brian,they give off very little gas. Certainly a lot less than wet cel batteries.Mainly the gas is given off duringcharging & in particular if the charging is not done right.On my AGMs there is a glued on cover plate running across thetops of all the valves to hold them in place. The valves themselvesare just a flexible cap. Any overpressure above a couple of psi justforces out the side of the flexible cap. I compensated mine with mineral oil, but used the scented baby oil from the supermarket. The chemicals in the scented mineral oilcaused it to off gas more than normal. When I changed to unscentedit stopped, but even then it wasn't excessive.Alan

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On 16/01/2016, at 7:57 am, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan,             I wouldn't mind knowing the workings of those AGM's since I will be using them inside my cabin.  Should I have a hydrogen monitor? Brian Cox

--- personal_submersibles at psubs.org wrote:

From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] battery compensation
Date: Sat, 16 Jan 2016 07:49:25 +1300

Hi Brian,the AGM batteries need to be kept at an internal pressureof between 1-6 psi to reabsorb gasses. They have little oneway valves on each cell & are difficult to compensate.Can go in to detail if you like.Alan

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On 16/01/2016, at 6:01 am, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hank,                 Using AGM batteries you may have less issues with topping off the cells. Brian

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] battery compensation
Date: Thu, 14 Jan 2016 18:47:38 +0000 (UTC)

Tom,I think the relay will be okay, I think I have done it in the past, just can't remember where ;-)    Hank 

    On Thursday, January 14, 2016 11:36 AM, TOM WHENT via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 I think that your lead acid battery weight in water question would be a simple matter, but you likely would have to calculate it individually for each size of cell. I would think the density could vary with the composition of each size. Most battery manufacturers provide a spec sheet for their batteries so it would be simple from the weight and dimensions provided to calculate the density and the specific gravity of the cell.

I have no ideas on the relays being in an oil bath. Would that lead to coking on the contacts?

From: "hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org>
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Sent: Thursday, January 14, 2016 11:48:28 AM
Subject: [PSUBS-MAILIST] battery compensation

Thinking ahead, I need to reduce the weight of my deep diver.  I am now planning external batteries- lead acid in oil.  This reduces the amount of syntactic foam needed.  My deal on CNG  tanks fell apart.  The ebay seller would not honour the sale, can't blame him.   I may go with store bought syntactic foam if business looks good with 30 dollar per barrel oil, Yikes.  
I am not sure how to go about the oil filled battery set up.  I assume the batteries are filled as high as possible with water then topped up with oil, then the compartment filled with oil and a rubber lid on that.  I assume you take a syringe with distilled water to top the batteries up from time to time.  This way you wouldn't have to drain the oil.Does anyone know how heavy a battery weighs under water compared to in air?
I also am thinking about having the reversing relays for the motors in the oil tank to reduce the amount and size of wires penetrating the hull.  I will just send small wires for messaging to the relays.Hank
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