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Author Topic: - 6 AND 12 volts from 2 batteries?  (Read 3139 times)

Martin [Admin]

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- 6 AND 12 volts from 2 batteries?
« on: June 01, 2008, 05:20:51 PM »

I'm probably going to really embarrass myself here (Not for the first ....or last time!), but is it possible to
connect up two batteries in series and parallel at the same time? ( 2 x 6v 4Ah lead acids for my Springer ).
What I'm trying to do is connect the batteries in parallel (6v) for the main drive but I need 12v for a fire hydrant
water pump.

... "suggestions on a post card or sealed down envelope."
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HS93 (RIP)

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Re: 6 AND 12 volts from 2 batteries?
« Reply #1 on: June 01, 2008, 05:22:48 PM »

no have you got any balast or can you take a bit of exta weight

HS93
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Tug-Kenny

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Re: 6 AND 12 volts from 2 batteries?
« Reply #2 on: June 01, 2008, 05:27:28 PM »


The only way to do it is by using only one battery for the 6 volt feed. A second 6 volt battery can be connected in series for a 12 volt line.

Failing this, you will need to change motors to a 12 volt system and forget running 6 volts.

Regards

Ken
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DickyD

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Re: 6 AND 12 volts from 2 batteries?
« Reply #3 on: June 01, 2008, 05:27:55 PM »

We used to do it on the 1:1 HGV's which had 2x12v batteries wired for 24v.

If we had items such as CBs that ran on 12v we just wired them off of the one battery.

Dont know about boat electrics though.
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Martin [Admin]

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #4 on: June 01, 2008, 05:28:07 PM »

Not really, well only the water that keeps leaking in!
I ask because I can't seem to find a decent 6v water pump anywhere.

How about wiring them in series, 12v and using a voltage regulator for 6v?
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boatmadman

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #5 on: June 01, 2008, 06:02:14 PM »

I use a 24v system on one of my boats, 2 x 12v batteries. I have the lights taken off one battery for a 12v supply, with the main drive off 24v.

This works fine, BUT, the lighting draws very little current, it may be different using a pump on one.

You would have to be careful charging, prob best to charge separately as 2 separate 6v units.

Ian
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Stavros

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #6 on: June 01, 2008, 06:56:15 PM »

Martin this is what you need the answer to all your prayers an Action P93 High power Multi controller where you can input 12v and get 6 out for your motor and still use 12 for the pump

http://www.modelboatmayhem.co.uk/forum/index.php?topic=7610.0


Stavros
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catengineman

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #7 on: June 01, 2008, 06:57:23 PM »

Beat me to it Stavros  O0
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catengineman

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #8 on: June 01, 2008, 07:10:46 PM »

Or and this is where I get told off  ::)

You could drill the top layer off the terminal within a 12 volt battery at the 6 volt position and affix a link wire. this gets 12 volt from the proper terminals and then 6 volt from the link.

Err, you need to know where the inner link is,
     don't drill too deep
     white metal the link wire in
     remember that the link and one other terminal will give 6 volts BUT as to which polarity depends on what side you connect to.

 
R,
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Stavros

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #9 on: June 01, 2008, 07:13:01 PM »

Price for one is allright as well,got one my self and was amaed at what it DOES NOT DO the gizmo is amaizing but on saying that you would not expect anything else from Milbs would you O0


stavros
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BarryM

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #10 on: June 01, 2008, 07:40:07 PM »

Not really, well only the water that keeps leaking in!
I ask because I can't seem to find a decent 6v water pump anywhere.

How about wiring them in series, 12v and using a voltage regulator for 6v?


Martin,

I had this problem with pumps that were claimed to work on 6 - 12 V but only produced a dribble at the lower voltage. The problem was solved by www.amodelworld.co.uk who came up with a Graupner 6V pump which, in my case, willl push water through two monitors for some distance and height. Give them a call.

Barry M
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gingyer

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #11 on: June 01, 2008, 08:03:27 PM »

I have sent an email to you martin on how I have done it before

Colin
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Tug-Kenny

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #12 on: June 02, 2008, 11:45:58 AM »

Not really, well only the water that keeps leaking in!
I ask because I can't seem to find a decent 6v water pump anywhere.

How about wiring them in series, 12v and using a voltage regulator for 6v?


As you have a 6volt motor system, this is where you need the power. Watts = Volts  X  Amps. So any regulator is going to have to be a big un!

The cheapest way is a 6 volt pump suggested by Barry. ( or you could try stopping the leak   ;))

Ken
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DickyD

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #13 on: June 02, 2008, 01:32:57 PM »

"Stopping the leak". Thats a bit radical Ken. ;)
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Martin [Admin]

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Re: Quart from a pint pot!
« Reply #14 on: June 02, 2008, 02:12:33 PM »

Someone emailed me simple idea, fit a 2nd small 12V battery...... Naaaa, far too simplistic.
I prefer the 'James Bond villain' approach, an over elaborate, complicated system that prone to problems!  {-)

NB. I am in the process of fitting a new shaft as we speak.
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DickyD

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Re: - 6 AND 12 volts from 2 batteries?
« Reply #15 on: June 02, 2008, 02:22:17 PM »

Haven't you got a job to go to Martin ?  :-\
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