Any dangers with this serial setup?

[shorza]

At the moment, I have 15 x 4s 5ah hard cases which i have paralleled into 5 taped up 'bricks' of 4s 15ah.

Now i just need to serial these 5 bricks to make 20s 3p.
Are there any dangers in connecting them this way?

 

[dogman dan]

Only when you get confused, and connect the black and red of the same pack together, or similarly connect the wrong set of black and red together shorting the whole pack.

If you break down the pack to charge, you must come up with a very rigid set in stone routine that will prevent you from short circuiting a pack, performing a kff.

I zapped a few packs myself, before I got a methodology developed that made it possible for me to connect em up correctly every time.