|
hummm, no I didn't get the pics. Maby resend? muddywatersfarm@hotmail.com Thanks, Scott Waters > From: glenbrown@vodamail.co.za > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] 36V verses 24V > Date: Fri, 26 Feb 2010 17:03:32 +0200 > > Hi Scott > Did u get my pics . > Glen > ----- Original Message ----- > From: "Sean T. Stevenson" <cast55@telus.net> > To: <personal_submersibles@psubs.org> > Sent: Friday, February 26, 2010 2:59 AM > Subject: Re: [PSUBS-MAILIST] 36V verses 24V > > > > Scott, if you want to use a 36 (or greater) volt system, it is simply a > > matter of series-connecting batteries or individual cells until you get > > the desired system voltage. Your charger would work across the whole > > bank, charging at 36V. There are a few ways to take 12V off of this > > without requiring a completely isolated 12V battery bank. The simplest, > > which is not recommended, is simply to draw 12V off of an appropriate > > number of batteries or cells in your bank. In that case, you would > > simply tap off the bank negative and an appropriate intermediate > > positive terminal. The reason this is not recommended is that this > > unequally drains the batteries, making them more difficult to charge, > > and over repeated charging cycles, reducing their performance. Another > > possible method, which is useful if you know all of your 12V loads with > > reasonable accuracy, is to split them among all of the batteries in your > > bank, similar to the method above, but split according to load in order > > to drain all of the batteries equally. Even if you get this right, > > however, this method has the disadvantage of having all of your 12V > > circuits at different potentials, which may complicate wiring and limit > > your expansion options - it's easy to make an expensive mistake when > > playing around with electrical connections at different potentials. The > > third, and best solution for simplifying charging and increasing battery > > longevity, is to use a DC to DC converter which takes the bank's 36V as > > an input and provides 12V at the output. By spanning the whole bank, > > this ensures that the batteries are equally drained. The disadvantage > > of such a converter is that it is inefficient, requiring greater > > capacity in the bank, and it is expensive. Depending on the scope and > > complexity of your electrical system, however, that may still be a > > better option than a completely isolated 12V bank. Note that an > > isolated emergency backup power system is not a bad idea and is > > advocated by ABS, so that is a consideration. > > > > -Sean > > > > > > Scott Waters wrote: > >> Ok. So I want to make sure I got all the facts straight. (This is for > >> my K-350) > >> > >> 36volt: > >> Advantage - More effecient power > >> Advantage - Has ability to provide more thrust (good in current or > >> dangerious situations) > >> Advantage - Last longer and won't overheat as likely > >> Disadvantage - Need second tru-hull (from pod to hull) because of > >> gauge of wire > >> Disadvantage - difficult to charge because of 12V and 36V both in pod > >> Disadvantage - more money for wire and parts > >> > >> 12volt: > >> Advantage - Easyier to wire (no need for extra tru-hull > >> Advantage - Easy to charge > >> Advantage - Costs less > >> Disadvantage - Less effecient power > >> Disadvantage - Less thrust (not 100% sure will have enough power, > >> snoopy is 12V and works, but it is smaller sub) > >> Disadvantage - Won't last as long, possible overheating in extreme > >> situations > >> > >> I am stuck in between a rock and a hard place as what to do. I want to > >> do the 12volt, but am worried it won't have the power I need. I don't > >> understand the K-350 plans as how to get the power from the pods to > >> the hull. I assume you run it through the aft battery vent and > >> actually vent with the forward vent. The blueprint only showes 2 vents > >> per pod, yet I noticed on Persistance there is a 3rd tru-hull. That is > >> one of the 3 main issues. The second is how in the world does the > >> charging work with a 36V and a 12V in the sub. I can only think the > >> way to do this is either have a 36V charger and a 12V charger or take > >> all the batteries out and charge them separately. The 3rd issue is > >> will a 12V system have enough power to run the motors with enough > >> thrust for a K-350? I heard that Snoopy is all 12V and manuvers fine, > >> but Snoopy is a K-250. I am pretty much at a stand still till I get > >> this problem solved. The next step is attaching the battery pods, but > >> I don't want to do that if I need a 3rd tru-hull. > >> Any help is greatly appriciated. > >> Thanks, > >> Scott Waters > >> > >> > >> ------------------------------------------------------------------------ > >> Hotmail: Free, trusted and rich email service. Get it now. > >> <http://clk.atdmt.com/GBL/go/201469228/direct/01/> > > > > > > > > > > > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > The personal submersibles mailing list complies with the US Federal > > CAN-SPAM Act of 2003. 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 > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > > > > -------------------------------------------------------------------------------- > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.435 / Virus Database: 271.1.1/2706 - Release Date: 02/23/10 > 19:34:00 > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. 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 > ************************************************************************ > ************************************************************************ > ************************************************************************ > Hotmail: Trusted email with powerful SPAM protection. Sign up now. |