# Didn't buy the 3 in 1 connector for 3X12V battery packs into a 36V pack- Can I make it? Is it hard?

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snowsurfer
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Joined: 03/30/2008
Points: 19

I bought a hobby battery, basically, it is three battery packs, each at 12V, and 4200mAh.
So they each have a tamiya connector right. Three female tamiyas for discharge. The thing is my
Crystalyte motor needs one single connector with 36V and 4200mAh. So how do I get this thing going?
I realized that the battery never came with the 3 in one connector. I need to make an adapter for this for 3 of the connectors to come together in series right? Is this hard? How can I do this? So, like connect, black to red, black to red, black to red (pos to neg) for series, then join it up? Do i need to solder?

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andrew
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Joined: 11/28/2006
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Re: Didn't buy the 3 in 1 connector for 3X12V battery packs

Say you have 3 connectors for the batteries, A1, A2, and A3. If the positive of A1 is the main positive, and the negative of A3 is the main negative than the - of A1 would connect to + of A2, and the - of A2 would connect to the + of A3.

Hope that explains it. Wear safety glasses, and gloves when connecting the finished connector to the battery. Measure the voltage on the output connector with a digital multimeter connecting the red probe to the positive, and the black probe to the negative (black), to make sure the polarity is right before you plug it into the bike input.

If the polarity is reversed, than the meter will display a - sign (or if the red probe is to negative, and the black probe is to positive).

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reikiman
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Joined: 11/19/2006
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Re: Didn't buy the 3 in 1 connector for 3X12V battery packs into

I have a couple pictures on Electrical Basics covering batteries in electric vehicles which may help understand what Andrew just said. You have it essentially correct.

There are several ways to make the circuit.

One way is to clone what they did in the picture.. another way I've done is to use a terminal block. These have a series of screw terminals, you connect the batteries to individual screw terminals and then jumpers between the terminals to form the connections. But that's a bit bulkier.

It would be better to make a small wiring harness with three tamiya connectors that go to the batteries, ending in one that goes to the controller. It would essentially be a loop of wire.

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snowsurfer
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Points: 19
Re: Didn't buy the 3 in 1 connector for 3X12V battery packs into

Thanks for the posts!
I didn't really quite understand that. Ummm... is there a simpler way of it? I don't really know batteries too much.

But the pack has 3 packs, each has a red and black, so 3 reds and 3 blacks. But the thing is I can't really connect up the batteries unless via a connector. The reason being is that I have three separate chargers each can charge a single battery that has a maximum of 12V. I hope this clears that part up.

Thanks!!!

andrew
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Joined: 11/28/2006
Points: 1361
Re: Didn't buy the 3 in 1 connector for 3X12V battery packs into

You can make the 3 to 1 connector. The female and male tamiya connectors can be gotten at radio shack, or you can get some here:
All Electronics Probably at any electronics supplier too.

In my above summary, I forgot to mention that the main positive (from connector A1), and the main negative (from connector A3) would go to the bike input mating SB connector if you still have the SB50 on.

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snowsurfer
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Re: Didn't buy the 3 in 1 connector for 3X12V battery packs into

How exactly do I make the connection? This seems foreign to me.
What I mean is how do I take 3 red and 3 black wires, and connect them together, so that they come out as only a single red wire and a single black wire that I attach to the motor?

Do I cut the wires with scissors then rip off the rubber part. Then solder something together? Do I expose the metal then wrap the other metal wires together around this then wrap that up with some rubber?

reikiman
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Points: 8444
Re: Didn't buy the 3 in 1 connector for 3X12V battery packs into

Since your questions are so very basic it inspired me with a thought that we should have a section of the site that offers some outlines or resources to electrical circuit basics.

The first page is: Wire stripping

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- David Herron, The Long Tail Pipe, davidherron.com, 7gen.com, What is Reiki
- Electrified Electra Townie, 1971 Karmann Ghia (since sold), Kia Soul EV

Ian
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Joined: 07/21/2007
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Re: Didn't buy the 3 in 1 connector for 3X12V battery packs into

why not just buy one from batteryspace get it in a couple days

reikiman
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Joined: 11/19/2006
Points: 8444
Re: Didn't buy the 3 in 1 connector for 3X12V battery packs into

Okay, Ian, we all start somewhere. Maybe snowsurfer wants to learn?

Next: Crimping wire

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- David Herron, The Long Tail Pipe, davidherron.com, 7gen.com, What is Reiki
- Electrified Electra Townie, 1971 Karmann Ghia (since sold), Kia Soul EV

snowsurfer
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Points: 19
Re: Didn't buy the 3 in 1 connector for 3X12V battery packs into

So let's say I have stripped wire. Some insulation removed. How do I connect it together to other stripped wire?
This is all within the scope of a connector as pictured in the original post. The seem to have some black tape covering the joint, or connection or some sort of rubber tape. I have a black wire, stripped, and want to connect it to a red wire (stripped) to make a series connection. Do I solder it? After this, there is metal exposed, how do I "re-insulate" it, to protect from arcs, and fires?

andrew
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Joined: 11/28/2006
Points: 1361
Re: Didn't buy the 3 in 1 connector for 3X12V battery packs into

Soldering is the best way. Heat-shrink tubing is the best insulator to cover the joint after soldering. You can get it at a hardware store, auto parts store, or electronics supplier. Just slip a piece on the wire before soldering, solder the wires, and then move the heat shrink over the exposed area. An electric heat gun, or lighter can be used to shrink it.

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