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Forums
4hv.org :: Forums :: General Science and Electronics
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Interesting battery question

Move Thread LAN_403
coillah
Tue Dec 28 2010, 09:58PM Print
coillah Registered Member #1517 Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
Say you have a stack of two 6v batteries. Could you, tap into one of the cells, to get a 6v line, and still use the stack for another part of your circuit?

I am guessing no. For several reasons.

Please send me your input!
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Bjørn
Tue Dec 28 2010, 10:14PM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
It would be like most other power supplies with multiple output voltages and a common ground.

The main problem is that they would discharge at different rates and make things more complicated when it comes to recharging.
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ubuntupokemoninc
Tue Dec 28 2010, 10:17PM
ubuntupokemoninc Banned on 1/22/2011 for repeated rule violations after multiple warnings.
Registered Member #3299 Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
drawn in ms paint ;D
1293574676 3299 FT104685 Untitled
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coillah
Tue Dec 28 2010, 11:40PM
coillah Registered Member #1517 Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
See it's not as simple as just tapping into one of the cells. Because current through one cell is more than the other, you begin to see one of the voltages failing more rapidly. Soon you loose your overall 12v.
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ubuntupokemoninc
Tue Dec 28 2010, 11:48PM
ubuntupokemoninc Banned on 1/22/2011 for repeated rule violations after multiple warnings.
Registered Member #3299 Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
making a curcuit board with a 555 timer, and a center tapped isolation transformer,

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Wolfram
Wed Dec 29 2010, 09:39AM
Wolfram Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
ubuntupokemoninc wrote ...

making a curcuit board with a 555 timer, and a center tapped isolation transformer,



What are you trying to say? I don't understand half of your posts, and I don't see how this is related to the topic. Chris Russell has already told you to read the rules, and I think you should do that if you want to stay here.
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Electroholic
Wed Dec 29 2010, 10:07AM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
If your loads are clearly defined, you can designed to have one of the 6Vmodlule to have more capacity to compensate for the extra current.
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Ash Small
Wed Dec 29 2010, 10:35AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
If you've some spare diodes, you could wire the stack up in series and parallel at the same time.

This would spread the load evenly over all the cells.

Without knowing more about you're project I can't comment on how suitable this solution will be, though.
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