Switch for Dual Battery System

[DavidSS]

I was looking to purchase a DPDT Swicth to switch between two Lithium Ion Batteries on an Electric Skateboard but I cant find one rated for DC batteries.
Each battery has a BMS with its own charger port, and a positive and negative wire leading to the motor controller.
The batteries are 37v with a max of 42v and run a 350watt motor.

Q - Do I need dual pole with switching on both the negative and positive wires?

Q - I cant find any DPDT switches rated to 42volt (I was looking for 10amp), can anyone advise where I can get a switch rated to this, or if there is a suitable AC switch?

Any assistance would be gratefully received

Cheers
David

 

[wesnewell]

Just posted this in another thread today. They also have lower amp versions.
http://www.newark.com/nkk-switches/sw3823d-uc/switch-rocker-dpdt-30a-48vdc-white/dp/10X9335

 

[DavidSS]

Thanks Wesnewell

It is interesting that on the side of the switch is is stamped 30A 30V DC but the fact sheet by the manufacturer says 30A 48V DC.

It is also interesting that Element14 sells them for USD$17.99 when they are AUD55 in Australia at Element14, I knew our economy was suffering but that is some exchange rate

 

[wesnewell]

If you would have read this, then might have understood.
Image is for illustrative purposes only. Please refer to product description.

 

[wineboyrider]

http://www.allelectronics.com/make-a-store/category/720/switches-rocker/1.html

 

[DavidSS]

Image is for illustrative purposes only. Please refer to product description.

yep it was pretty clear when I read it properly.
I appreciate all of the replies, even the one that pointed out I cant read,
The switch recommended is the best I have seen so far so thanks, the others either don't have a DC rating, or are rated lower.

Do you think I should use a dual pole switch or would a single pole suffice.
Can I join the two negatives from the BMS's of each battery and just switch the positive, or is it safer to switch both positive and negative.

cheers

David

 

[wesnewell]

I think standard practice is to switch both, but I can't think of a reason just switching the pos. wouldn't work as long as you're sure the other wouldn't get shorted for some reason.

 

[DavidSS]

Wesnewell Thanks again. The dual battery system works a treat. I tested it at 42.5km range on All Terrain Wheels, Not bad for a Evolve Carbon board that had a range of 20km top (I got a bit of extra range as the second battery is new)

Cheers David

 

[DrkAngel]

Used in eZips for 24V 35A controllers (450w motor)
But have used w/37V 35A (675w motor)
Last several hundred cycles ... but get a spare.
Dual battery switch - ≤$2.20
15A as dual (+-) disconnect 30A as single (+) disconnect.