Wiring question

[boxydan]

For my second chair the battery wiring is a bit different. Instead of the 12v batteries being connected directly in series and having the pack ground and positive going to the controller, each of the batteries have a harness connected via I think a Tamiya connector then each of those heading off to the controller. Obviously they get wired in series at some point, just behind the "black box" of what I can see. If I did a Li pack and had a separate charge cable with balance leads, should I create it as 2 x 4 cell packs and charge separately at 12.8v or can I still have it as a single 8 pack? Would I still have to have the harness connected between cells 1-4 and 5-8? or a single 1-8 connection?

[Burgerman]

All depends on where the batteries sit, what they did and why, and it may help to know the chair. Some chinese portable ones have 2 x 24 ones so that you can run on one battery. And these are in parallel somewhere. And because with lithium ion, rather than LiFePO4, you need 7 series cells. Which is a bit hard to divide up!

Best bet take apart and look. At he end of the day provided you send the correct nominal voltage to the controller it doesent matter how you do it.

[boxydan]

Its a Pride Jazzy 614

they are 2 x 12v 55ah that comes with the chair.

I meant LiFePO4 so 8 cells total.

I am working on another one first so this is in planning stages. Just want to get things from China ordered I need.

[boxydan]

Link to video on battery/harness

https://youtu.be/4TMLvM5nUV0?t=136

[shirley_hkg]

Connect as usual, and then find out the 2 terminals that give 24V.

Follow to single out the 2 pins accordingly. That will be the points to apply 24V safely.

[boxydan]

Connect as usual, and then find out the 2 terminals that give 24V.

Follow to single out the 2 pins accordingly. That will be the points to apply 24V safely.

Let me see if I understand -

With chair as is with the lead monsters - check with multimeter + and - of opposite batteries and see if I have 24-ish volts? Then drop in 4 LiFePO4 cells with the 4-pack + and - at those points?

[Burgerman]

It doesent matter HOW you do it. As long as your 24 volts goes to the 2 power connector terminals, a single plug on the power module.

[Burgerman]

You feed it 24V into the centre plug above. You can do that with a new connector, your existing connector, or connectors, or any way you want!


24 volts goes to these two centre pins. This is where your battery connects. Follow the wires from here to see what they did. Use existing cables if that is suitable.

[Burgerman]

This isnt my chair. It is the SAME as the chair I use. A salsa. With plastic covers and seat removed. Note that the arrow points to the cable you need. Take out lead battery. Unplug the cable with the arrow. Pull... You now are holding the chairs battery loom.

Its then obvious how to connect the lithium battery. Because you can see what they have done.

[boxydan]

I found the manual for the controller and pic of the harness.

https://www.dynamiccontrols.com/sites/default/files/2018-05/SHARK%20PMA_PMB_PMC%20Installation%20Manual%20Iss%207.pdf



Says a 30-40A fuse goes between the series connection on batteries. Then a 24v to the controller.

Since I can connect the cells in series and get a 24v load, what do I do with those two ring terminals? Of just separate the pack in two 12v cells?

[shirley_hkg]

Connect as usual, and then find out the 2 terminals that give 24V.

Follow to single out the 2 pins accordingly. That will be the points to apply 24V safely.

This is for a 24V pack.

2 X 12V setup will be against your idea to hide it neatly.

You will have 2 pins not in use. Set them aside.