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Author Topic: 12v to 6volt reduction  (Read 1287 times)

Cornishman

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12v to 6volt reduction
« on: August 25, 2011, 12:26:49 PM »

I am building a boat which I have to run the motor on 12 volts. However I also have a bow thruster which I need to run at 6 volts. I could wire two 6 volt batteries in series and take a centre tapping to give me a 6 volt supply, or install  one 6 volt and one 12 volt battery and use two separate supplies, But is there a better way I can do this possibly electronically?
Can anyone help?
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john s 2

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Re: 12v to 6volt reduction
« Reply #1 on: August 25, 2011, 01:06:47 PM »

A centre tap would be fine or as you say a 12v and 6v battery Could be better depending on space and weight. John.
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malcolmfrary

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Re: 12v to 6volt reduction
« Reply #2 on: August 25, 2011, 05:21:18 PM »

Since the thruster will probably be used intermittently, the center tap should be fine.  Either that or a separate battery.  Trying to do it electronically, at the current required, would result in an electronic lump about the same size.
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dreadnought72

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Re: 12v to 6volt reduction
« Reply #3 on: August 25, 2011, 06:48:18 PM »

What's the max amps of the bow thruster? Because, as I found out in the Racundra thread, there's a cheap(ish) way to get 6V out of a 12V stone if <5A is ok.

Andy
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Cornishman

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Re: 12v to 6volt reduction
« Reply #4 on: August 25, 2011, 07:26:43 PM »

It is the Graupner 1785 thruster with a Speed 400 motor quoted at 4 amps at max efficiency
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dreadnought72

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Re: 12v to 6volt reduction
« Reply #5 on: August 25, 2011, 09:31:49 PM »

Hmmm...then the regulator I mentioned would seem to be ok.

It contains an LM338T (a guess, but based on some reading about the subject) and a few components to lower a 12V source to 6V output, and is capable of outputting 5A. If the bow thruster is going to run for short periods now and again, I can't see this regulator melting. Might be worth a punt since it's only a tenner?

Andy
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cos918

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Re: 12v to 6volt reduction
« Reply #6 on: August 26, 2011, 05:31:37 AM »

There is this
http://www.harbormodels.com/site08/main_pages/power_distribution_panel.htm

But a 6V battery would be cheaper.

John
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Timo2

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Re: 12v to 6volt reduction
« Reply #7 on: August 26, 2011, 07:52:04 AM »

Hi Cornishman

    I have a PM

 Timo2
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