<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Alan, I thought you indicated that it's not good to compensate the AGM's because they can't vary over 6 psi ?</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: Alan via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] battery compensation<BR>Date: Sat, 16 Jan 2016 09:46:38 +1300<BR><BR></DIV><DIV>I am not sure Brian,</DIV><DIV>they give off very little gas. Certainly a lot less than wet cel batteries.</DIV><DIV>Mainly the gas is given off during</DIV><DIV>charging & in particular if the charging is not done right.</DIV><DIV>On my AGMs there is a glued on cover plate running across the</DIV><DIV>tops of all the valves to hold them in place. The valves themselves</DIV><DIV>are just a flexible cap. Any overpressure above a couple of psi just</DIV><DIV>forces out the side of the flexible cap. </DIV><DIV>I compensated mine with mineral oil, but used the scented baby oil </DIV><DIV>from the supermarket. The chemicals in the scented mineral oil</DIV><DIV>caused it to off gas more than normal. When I changed to unscented</DIV><DIV>it stopped, but even then it wasn't excessive.</DIV><DIV>Alan<BR><BR>Sent from my iPad</DIV><DIV><BR>On 16/01/2016, at 7:57 am, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV>Alan,</DIV><DIV> 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?</DIV><DIV> </DIV><DIV>Brian Cox<BR><BR>--- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A> wrote:<BR><BR>From: Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>To: Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>Subject: Re: [PSUBS-MAILIST] battery compensation<BR>Date: Sat, 16 Jan 2016 07:49:25 +1300<BR><BR></DIV><DIV>Hi Brian,</DIV><DIV>the AGM batteries need to be kept at an internal pressure</DIV><DIV>of between 1-6 psi to reabsorb gasses. They have little one</DIV><DIV>way valves on each cell & are difficult to compensate.</DIV><DIV>Can go in to detail if you like.</DIV><DIV>Alan<BR><BR>Sent from my iPad</DIV><DIV><BR>On 16/01/2016, at 6:01 am, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV>Hank,</DIV><DIV> Using AGM batteries you may have less issues with topping off the cells.</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A> wrote:<BR><BR>From: hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>To: Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>Subject: Re: [PSUBS-MAILIST] battery compensation<BR>Date: Thu, 14 Jan 2016 18:47:38 +0000 (UTC)<BR><BR></DIV><DIV style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><DIV><SPAN>Tom,</SPAN></DIV><DIV dir="ltr"><SPAN>I think the relay will be okay, I think I have done it in the past, just can't remember where ;-) </SPAN></DIV><DIV dir="ltr"><SPAN>Hank</SPAN></DIV> <DIV><BR><BR></DIV><DIV style="display: block;"> <DIV style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <DIV style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <DIV dir="ltr"><FONT face="Arial" size="2"> On Thursday, January 14, 2016 11:36 AM, TOM WHENT via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR></FONT></DIV> <BR><BR> <DIV><DIV><DIV><DIV style="color: rgb(0, 0, 0); font-family: arial, helvetica, sans-serif; font-size: 10pt;">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.<BR><BR>I have no ideas on the relays being in an oil bath. Would that lead to coking on the contacts?<BR><BR><HR><DIV style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; font-style: normal; font-weight: normal; text-decoration: none;"><B>From: </B>"hank pronk via Personal_Submersibles" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR><B>To: </B>"Personal Submersibles General Discussion" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR><B>Sent: </B>Thursday, January 14, 2016 11:48:28 AM<BR><B>Subject: </B>[PSUBS-MAILIST] battery compensation<BR><BR><DIV><DIV style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><DIV dir="ltr">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. </DIV><DIV dir="ltr"><BR></DIV><DIV dir="ltr">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.</DIV><DIV dir="ltr">Does anyone know how heavy a battery weighs under water compared to in air?</DIV><DIV dir="ltr"><BR></DIV><DIV dir="ltr">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.</DIV><DIV dir="ltr">Hank</DIV></DIV></DIV><BR>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV><BR></DIV></DIV></DIV><BR><DIV>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV><BR><BR></DIV> </DIV> </DIV> </DIV></DIV>_______________________________________________
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