Thanks Endless sphere - First battery build

[barbs00]

Reposting here as I put in wrong location initially.
Hi All,

After a weekend of involving much head scratching and some truly terrible solder joints I have almost completed my first battery.
It is a 14S 5P made with LG MG1 cells - making it 52v and 14Ah. I have a BBSHD arriving next week

I would like to say a big thanks to all the endless sphere members who have helped get me to this point and for answering my Noob questions. Also, Micah Tolls Ebook and website were an amazing help.(His site is http://www.ebikeschool.com/)

I used an Ardunio spot welder from http://www.malectrics.eu which worked great (once I got a big enough car battery)



The welds are very strong and even difficult to pull apart with pliers.

Pics of almost finished battery




I think I have a faulty BMS as I am have 50.6v going into the BMS and only 12.8v out. I have triple checked the wiring and it seems fine so i guess the BMS is faulty? Any ideas?

Cheers,

Barbs

 

[d8veh]

Check the voltage on the pins of the multipin connector that they run in increments of about 3.6v on each pin.

 

[barbs00]

Yep they run up in 3.6 increments

 

[d8veh]

Did you check the markings on the BMS's pcb for the multi-pin connector? Sometimes they start at B0 (ground) and sometimes they start at B1. Sometimes the last one is B9, sometimes it's B10 and sometimes they have an additional B+ there.

 

[heavymetalthunder]

Nice job. Becareful where you mount the pack and it can affect the center of gravity.

 

[barbs00]

Have decided to chuck the BMS and balance using a hobby charger