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 FAQ - Connecting batteries to get 18 volts
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chopper
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Illinois
USA

1228 Posts

Posted - 09/13/2006 :  12:53:09  Show Profile  Visit chopper's Homepage  Click to see chopper's MSN Messenger address
This can be done one of two ways. The first being just adding a 6 volt battery along with your existing 12 volt. Some people think this shortens the life of the batteries by not using similar battery capacities.

The other way is to replace the single 12 volt battery, with 3 6volt batteries wired in series. The benefit is that you can charge all 3 batteries in parallel.

PLEASE BE SURE NOT TO SHORT ANY OF THE BATTERIES OUT WHILE YOU ARE DOING THIS! BE VERY CAREFUL AND DOULBE-CHECK YOUR WIRING AS YOU GO, IT'S VERY EASY TO HOOK A WIRE UP TO THE WRONG TERMINAL.

Now for the schematics:
This is actually very simple, if you are using one 12 volt battery and one 6 volt, simply connect the positive lead from the car to the POSITIVE terminal on the FIRST battery. Connect the NEGATIVE terminal of the FIRST battery to the POSITIVE terminal on the SECOND battery. Finally connect the NEGATIVE terminal of the SECOND battery to the NEGATIVE lead coming from the car. This is called wiring in SERIES and will produce 18volts.

For three 6 volt batteries. Connect the POSITIVE lead from the car to the POSITIVE terminal of the FIRST battery. Connect the NEGATIVE terminal of the FIRST battery to the POSITIVE terminal of the SECOND battery. Connect the NEGATIVE terminal of the SECOND battery to the POSITIVE terminal on the THIRD battery. Connect the NEGATIVE terminal of the THIRD battery to the NEGATIVE lead coming from the car. This is also series wiring and will produce 18 volts.

If you have a voltmeter and you are unsure of your wiring, hook it up to the two leads you have coming off the batteries and see if you have 18 volts there. If you do, you're good to go, if not, go back and check your wiring.

All "connections" to the batteries can be accomplished with female spade connectors and short jumper wires between batteries. Conections to the car leads can be made with barrel style connectors installed on the battery wiring and car leads.

This picture is a perfect example of how to connect 3 6volt batteries to get 18 volts.


18.59 KB


This video may help if you are having trouble understanding these connections.
http://www.modifiedpowerwheels.com/viewblog.aspx?blogid=101

Another video here:
http://www.modifiedpowerwheels.com/page.aspx?pageid=battery_connectors_video

Edited by - swhenrik on 09/16/2008 13:22:28

swhenrik
Moderator

Pengilly
MN
USA



4067 Posts

Posted - 09/16/2008 :  13:27:20  Show Profile  Visit swhenrik's Homepage
How to charge your 18 volt setup?

1. Probably the easiest option to operate, once installed, is with an 18 volt charger. There's one available from minimoto. Charging the batteries in series is only acceptable if the batteries are matched in capacity, age, amount of discharge, etc. If they aren't, one may overcharge and/or one may undercharge. The problem worsens with each use.

2. If you are running a 12 volt and a 6 volt, and don't want to do the 18 volt charger, there's only one other choice..... charging the 2 batteries seperate.... one with a 12 volt charger and one with a 6 volt charger.

3. If you are running triple 6 volt batteries, you can wire them in series in the vehicle to get 18 volts, but then wire them in parallel for charging. Then charge with a charger able to charge 6 volt batteries. Depending on the charger, this might be slow. If using something like the Schumacher 600a, you can set the charge current up. For triple 12AH's batteries, you could charge at a full 6 amps. See the next post for how to connect them.

For more info on chargers:
FAQ - Which charger should I use?

Projects: Jeep, Bigfoot, Lil' Quad, Dora Quad, Dirt Grinder, Nascar, Intro, Ultimate Gaucho

Edited by - swhenrik on 09/17/2008 06:15:10
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swhenrik
Moderator

Pengilly
MN
USA



4067 Posts

Posted - 09/16/2008 :  13:30:02  Show Profile  Visit swhenrik's Homepage
For the connection to swap triple 6 volt batteries between series and parallel, one option is to make up a seperate pigtail for running in the vehicle, and one for running on the charger. Here's an example using Deans Ultra Plugs, but other styles of plugs will also work.

This would be your "series" plug for in the vehicle:




And this would be the "parallel" plug for charging:


Projects: Jeep, Bigfoot, Lil' Quad, Dora Quad, Dirt Grinder, Nascar, Intro, Ultimate Gaucho
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