Schottky Battery Combiner?

[rsisson]

Is this what I need to combine two battery packs ?

http://item.express.ebay.com/__Electronic-Components_Microsemi-CPT30060-300A-60V-Schottky-Rectifier-Diode_W0QQitemZ200198422924QQihZ010QQptdnZElectronicQ20ComponentsQQptdiZ688QQcmdZExpressItem

(Search ebay express for CPT30060)

It is a common cathode 300A 60V dual Schottky

I would go from the battery positives to the anodes (the towers) and the base (the cathode) would continue to my controller

I would combine the Battery grounds with a good splice...

Did I get this right ?


Bob

 

[kbarrett]

That may work.

Not sure if Justin's sealed units contain two, or one + a splice ... you'll need to ask him.

That Schottky is seriously oversized for bicycle applications ... maybe good for an EV.

 

[Dr. Shock]

The diodes don't need to be rated for the total volts/amps of the system, just what the individual pack puts out (plus a margin for safety, say 25%.) If each pack puts out 36 volts and you expect to draw no more than 20 amps per pack, you could use diodes rated at 45 volts and 25 amps, allowing a 25% margin. These would be a lot smaller and cheaper.

For each parallel group, I'd think you'd want the battery pack negs connecting to the cathodes, and the anodes connecting to fuses, after which the negatives would join in a bus, and out to the controller (or series connections with other battery groups). The battery positives would all be joined to a common positive bus.

Remember that electrons are coming out of the battery negative poles. They can flow past the cathode to the anode, but not the other way.

Edit: I think your way would also work, now that I think about it. I generally isolate the negatives because the controllers have a positive common. Maybe this doesn't matter.

 

[rsisson]

WAY Oversized...but cheap..and near indestructible for my application...