Dual NP1 cups and BDS

[osa]

I recently added a 2nd NP1 to my bag to spread out power, now some devices power off of 1 NP1 and the BDS for the rest of the devices powers off a 2nd NP1. I came across a dual np1 cup wired for BDS on a usual suspect site and was curious if i could build this myself. I would much rather have a single switch but maintain the same runtime i am currently experiencing. anyone willing to lend some guidance with the correct way to wire 2x np1 cups for proper voltage? or, is there any reason i would have less runtime chaining batteries together and i should stay with my current set up?

-Ken

[John Blankenship]

Just wire the two cups in parallel. 

It's a good idea then to use battery pairs with the same capacity that have about the same charge and reserve capability.

[osa]

thanks John!

-Ken

[Derek H]

I wouldn't mind a parallel wired double cup rig for my small bag just so I could hot swap without having to stop anything.

[John Blankenship]

My bag has been run with double NP1s for about a year and a half now.  My cart, which is either battery or AC (and is automatically switchable) was double NP1 for a long time, and is now quad NP1 when battery powered.

The ability to swap batteries while still running is a nice plus.

[Ed Denton]

Old topic, but still relevant. In terms of parallel wiring, is this simply tapping a wire from the +ve terminal of cup 1 to +ve of cup 2 and -ve to -ve?

[John Blankenship]

Yes. The one caveat I would offer is that it's good practice to have the batteries fairly well balanced. That means the same type and capacity, amount of charge, etc. 

 

Although, when swapping batteries my experience is you can do one and then the other, with no problem. 

 

I will add -- proceed at your own risk and don't hold me responsible for anything you try. (Even though I have three different bag systems and a cart working fine this way.) 

 

[Derek H]

I wonder if the batteries weren’t well balanced charge-wise if you’d have one starting to charge the other?