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Fork lift and pallet jack batteries are lowered into an steel enclosure and sealed to stay in place...If these very large cells could be obtained out of this enclosure...I am looking into this already...and arranged in a suitable manner, you have the ultimate psub power source! It also answers many issues with needed ballast as the arrangment could be low and sealed for ventalation purposes. (almost sounds like a submarine I was aboard) David Bartsch > From: kocpnt@tds.net > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] uneven charging > Date: Sat, 10 May 2008 09:03:03 -0500 > > Hi Irox, > > Forklift batteries are exceptional for continous drain situations and last a > long time due to the extremely deep charge that they will accept. Unless you > are the exception to the rule, they are unusable in a Psub because the will > not fit thru a 24 inch hatch and cannot be replaced that way. If you have a > way to solve this problem it is probably the best battery on a cost/output > basis that can be found!! > > Best Regards, > > Jim K > ----- Original Message ----- > From: "irox" <irox@ix.netcom.com> > To: <personal_submersibles@psubs.org> > Sent: Friday, May 09, 2008 6:28 PM > Subject: RE: [PSUBS-MAILIST] uneven charging > > > > > > Has anybody compared forklift batteries to 12V deep cycle batteries > > as far as cost and capacity? > > > > I've been looking around for a battery solution for my sub. I've got > > plenty of volume, so space isn't really an issue. I would like as > > much capacity as I can afford - I like the figure "3tons". > > > > I figure I'll probably kill my first set of batteries through improper > > use (although I do plan to try my best to not damage them). So I > > thinking going with a number of smaller isolated battery banks, these > > should provide at least several hours of operation time, before they > > get drain to the point that I have to switch to the next bank. This > > way I can start with one or two banks, and once I'm happy I've got a > > solution that works reliably, build out the rest of battery banks. > > > > Cheers, > > Ian. > > > > -----Original Message----- > >>From: "Jay K. Jeffries" <bottomgun@mindspring.com> > >>Sent: May 9, 2008 6:44 PM > >>To: personal_submersibles@psubs.org > >>Subject: RE: [PSUBS-MAILIST] uneven charging > >> > >>Forklifts and large submarines have a luxury that unfortunately we cannot > >>afford in PSUBS and that is the use of large volume batteries. An > >>application closer to us is the scooters used in tech diving that are used > >>to explore miles of underwater caves in a given dive. They test their > >>batteries by measuring the various discharge rates of batteries and group > >>similar discharge rated batteries together as they have the same charging > >>rate and do not display the issues described in previous posts. They are > >>tested regularly over their lifetime to insure matched service. When you > >>purchase batteries, you can request that the battery firm provide you with > >>a > >>matched set for a small premium and thus save buying a bunch of batteries > >>and matching them yourself. If you replace one, you have to replace all > >>to > >>keep matched service. > >>R/Jay > >> > >> > >>Respectfully, > >>Jay K. Jeffries > >>Andros Is., Bahamas > >>Vive vt vivas > >>- Live that you may live > >> > >> > >>_____________________________________________ > >>From: owner-personal_submersibles@psubs.org > >>[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Hugh Fulton > >>Sent: Friday, May 09, 2008 18:07 > >>To: personal_submersibles@psubs.org > >>Subject: RE: [PSUBS-MAILIST] uneven charging > >> > >> > >>The best solution, I have been told, is to use 2 volt cells in series. > >>This is how forklifts etc do it as it is very hard to get the internal > >>resistance of batteries to be the same. Forklift batteries generally have > >>2 > >>volt cells that are up to 2000 Amp-hours per cell. This is why you should > >>always recharge batteries, that are in parallel, in isolation. Also > >>batteries left in parallel can discharge themselves through this > >>unevenness. > >>All this was explained to me by a battery importer. Makes sense to me but > >>I > >>am still going for parallel as the 2volt cells with high amp hours are a > >>crazy size physically. This probably explains some of the problems I have > >>in my boat which has 3 batteries in parallel. It is very common advice in > >>the marine industry that id you are using batteries in parallel you should > >>use the same manufacturer, size and model of battery. > >> > >>Hugh > >> > > > > > > > > > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > The personal submersibles mailing list complies with the US Federal > > CAN-SPAM Act of 2003. 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Your email address appears in our database > because either you, or someone you know, requested you receive messages > from our organization. > > If you want to be removed from this mailing list simply click on the > link below or send a blank email message to: > removeme-personal_submersibles@psubs.org > > Removal of your email address from this mailing list occurs by an > automated process and should be complete within five minutes of > our server receiving your request. > > PSUBS.ORG > PO Box 53 > Weare, NH 03281 > 603-529-1100 > ************************************************************************ > ************************************************************************ > ************************************************************************ > Stay in touch when you're away with Windows Live Messenger. IM anytime you're online. |