Rebuilding a Ping Pack

[Link]

So.

This is definitely going to end up as the most complex part of the bike by far. The goal is to get a battery, charger, balancing system (and associated LVC), controller, and plug braking coil all into a single package that can easily and quickly be removed and swapped around on my bikes.

Oh, yeah, I'll probably put some EL paper in it somewhere to increase my visibility for the occasional night ride. Also because it would look cool.

Impossible, you say? Unlikely. Insane, you say? Possibly. Awesome? Undeniably. 8)


I more or less have everything worked out, but I could still use a bit of help with something here or there. Right now, I'd care to know where I can get a good single cell charger. A proper charger, not just a CC/CV power supply (though I'll need one of those capable of 100V and 5A, too). I've seen some at batteryspace, but 20$ apiece seems a little pricey. I dunno.

Less importantly, I could swear I saw a link around here to a site that sold some random stuff. There was a particular board there with several dozen relays on it. I don't need this one specifically, but it would be nice to have.

 

[Link]

I think I was sent the wrong pack. It's too small. No way is this 20Ah. I don't care if there ARE 64 cells. I won't believe it.

EDIT: Oh, thank the Flying Spaghetti Monster. There's voltage on every cell group. The BMS apparently does a good job, too, because they were all EXACTLY at 3.33V.

EDIT 2: Huh. What was wrong with this thing again? No voltage? Or nothing from the charger? I get full voltage at the plug. :?

One of the wires for the BMS is separated from the cell (the first P group), though, so that may have been the problem with it not wanting to charge. I dunno.

 

[dogman dan]

Actually that looks about the right sise to me. Hard to get used to how small they are. I forget what voltage you got, but 36 v 20 ah should be around 15 pounds and 48v 20 ah should be about 20.

 

[Link]

Perhaps that bit of humor was too subtle for the internet. :?

 

[dirtdad]

I thought it was humor, but in my case it made me a little nervous :| :wink:

 

[dogman dan]

Dang, showing my age again.

 

[Link]

LOL anybody know the right way to wire up a Ping BMS? I think I have it right, but I wanna be sure.

There are three holes in the BMS board of note: one labeled b- (battery negative?), one labeled c- (charger negative?), and one labeled p- (motor negative?).


Managed to fix the original wiring harness, too. No biggie.

 

[dirtdad]

That is right, I think it is somewhere in the Ping pack thread. B and C are good lablels, bui I am not sure what P is supposed to stand for. Power negative?