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Hey everyone, Thank you so much for the help. I have decided to instal a third tru-hull and run my boat on both 12v and 36v. Alot of the parts I have are originals and that includeds the motors, haha. Everyones imput deffenetly gave me alot more knowledge on the subject. Also, while I'm posting, does anyone know any more details about the psub conference in Ft. Peirce, FL? All I pretty much know is it is July 14-18. I really would like to attend this and meet all you guys for the first time. Again Thank you so much for all your help, Scott Waters To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] 36V verses 24V Date: Fri, 26 Feb 2010 07:38:54 -0500 From: vbra676539@aol.com There is a good bit of confusion about this, apparently. The drawings with penetrators are the ones taken from the Lloyd's boat and the Japanese certified boats. They are the best circumstance. However, they aren't the only way to do business. The aft pod penetration carried power for 75% of George's boats, with the forward being used as a ventilator. This can be improved on but, as I said, you can't beat it for quick and dirty.
Vance
-----Original Message----- From: James Frankland <james@guernseysubmarine.com> To: personal_submersibles@psubs.org Sent: Fri, Feb 26, 2010 4:57 am Subject: RE: [PSUBS-MAILIST] 36V verses 24V Hi Scott. Just in responce to this question.
>I don't understand the K-350 plans as how to get the power from the pods to the
hull.
Im actually doing my pod vents and electrical through hulls tomorrow. I'll take
a load of pics as i do it.
The plans show some old electrical penetrator which i dont think you can get any
more. I couldnt find it anyway.
but the important point is that the wiring definitly does not go through the
vents. They need to be shut up for diving, otherwise if you spring a leak in a
pod, it would flood up into the cabin. You need proper penetrators regardless
of your choice of voltage.
I'm using a design by Alec Smyth which i suspect is similar to Dans. There are
2 per pod (for positive and negative). 1 replaces the aft vent, a second is
added conveniently placed in between the next set of ribs, and finally the front
vent is as per the plans. I believe thats why Dans boat looks like he has 3
vents, but its probably the same as mine, 1 vent forward, and 2 penetrators.
(or he has 2 vents as per the plans and 1 multi penetrator - i dont know)
I havent got this bit finalised yet, but Im using 24v MinnKota motors so i will
probably have 2 banks of batteries wired up independantly with switches so i can
change from port (power the whole boat), starboard (power the whole boat) or
both (power the whole boat). I will probably carry a spare battery inside also.
Kind regards
James
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
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