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Re: [PSUBS-MAILIST] 36V verses 24V



Scott,
Don't twist yourself in knots about this. The aft penetration is not a vent. It is the cable penetrator. The forward penetration IS a vent. They are duplicates for simplicity. Dan put a third penetrator in to support the electrical penetration bulkhead that he designed. It's a beauty, but you don't have to do it that way. Use twelve volt thrusters if you want to. It is a small investment. If they aren't strong enough (and they won't be) then build a 36 volt system on the bench and retrofit next winter, or the winter after that.
Vance


-----Original Message-----
From: Scott Waters <muddywatersfarm@hotmail.com>
To: psubs <personal_submersibles@psubs.org>
Sent: Thu, Feb 25, 2010 6:40 pm
Subject: [PSUBS-MAILIST] 36V verses 24V

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
 


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