Re: [PSUBS-MAILIST] 12 or 24v ?

[Gregory Cotton <gregc02@gmail.com>]

I'd run the 36 volts from the pods. I'd rather have a 12 volt gel cell
or two for "house" loads; that way if you have an electrical problem
in the pods you still have power for all the house loads. In fact, in
the interests of redundancy, I'd keep both 12 volt house batteries
separate so you can run them separately or parallel and/or even charge
them through a regulator from the propulsion batteries in the pods.

I'd run the pods into the main hull separately too.

Back when I ferried aircraft overseas I used 12 volt HF radios but
most of the aircraft were 24 volt. I've still got a couple of heavy
duty converters that regulate 18-30 volts down to 12 volts. The modern
switching regulators are probably a bit more efficient.

Greg

On Wed, Jun 13, 2012 at 9:21 AM, Jon Wallace <jonw@psubs.org> wrote:
>
> Not an electrical engineer here but I don't think it matters whether you
> link them in the pods or cabin.  As long as you're pulling 24v properly the
> current draw is going to be the same regardless of where you link the leads.
>  Assuming proper wire gauge for the required amperage there should be no
> more heat produced at the penetrator regardless of where you link the wires.
>  Linking the wires in the pod means fewer wires through the penetrators.
>
> I will be using 36vdc motors and for the sake of simplicity have been
> considering pushing the 36v from the pods for the motors and using an
> appropriately sized battery in the cabin for internal components.
>
> Jon
>
>
>
>
> On 6/13/2012 9:21 AM, James Frankland wrote:
>>
>> Hi All,
>> Does anyone have any thoughts on this?
>> My motors are 24V minn kotas.  Do you think i should pass 12v through the
>> pods and link them up 24v inside?  Or link them up 24v inside and bring that
>> through?
>> 12v seems easier and i can run 12v things inside, but less efficient and
>> might produce more heat on the penetrators.
>> 24v more efficient and easier on the penetrator but i'll need a
>> transformer inside to run 12v equipment.
>> Ive no idea what the penetrators run at.
>> Any thoughts?
>> Many thanks
>> James
>
>
>
>
>
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