36 Volt In Series From Six 6-volt Batteries - Electrical - DIY Chatroom Home Improvement Forum

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Old 09-30-2011, 10:36 PM   #1
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36 Volt in Series from six 6-volt batteries

Is it possible to tap off from two of the batteries to produce a 12-volt lighting system to power 12-volt car lights?


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Old 10-01-2011, 12:54 AM   #2
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It's possible, but strongly discouraged. Series operation of batteries relies on all the batteries having equal charge and discharge characteristics to keep the cell voltages and charge states equalized. If you draw power from some batteries in the stack and not others, those batteries will end up under-charged (or even reversed, under the wrong conditions). This will quickly destroy the unlucky battery. If the load is absolutely minimal, and the charger applies an "equalizing charge" (controlled overcharge) regularly and the batteries can handle that procedure, then it can be done without problems.


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Old 10-01-2011, 02:15 AM   #3
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Originally Posted by NORMEL View Post
Is it possible to tap off from two of the batteries to produce a 12-volt lighting system to power 12-volt car lights?
It can be done but C'est not the best methold to use this and there is proper voltage converter for this purpose I have dealt with this all the time with forklift trucks which they run 36 or 48 volts system and we add a power converter unit to drop from that voltage to safe 12 volt useage for some of the light or twoway radio etc which it required 12 volt source { one very common item I know nowdays is cellphone charger or other device to charge up }

There is 36 volt headlight avabile but you will not find this in most auto part store even big box at all this useally found in industrial truck part store or dealership.

The answer will be based on NEC ( National Electrical code ) or CEC ( Cananda Electrical code ) or ECF ( Electrique Code France )
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Old 10-01-2011, 08:10 AM   #4
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I did this with an electric golf cart. This was for occasional use and is not recommended for heavy use.

6 - 6 volt deep discharge batteries, tapped 2 of them to get 12 volts for a set of head lights.

The problem is you are discharging the 2 tapped batteries more than the other 4. If you consistently this a lot you can screw up the whole string of batteries
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