# Cascading 7s-121s bluetooth bms **URL:** \ **Category:** Buy, Sell, & Trade\ **Created:** [January 30, 2019, 8:22pm UTC](https://community.electricforum.com/t/cascading-7s-121s-bluetooth-bms/15346 "2019-01-30T20:22:34Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [January 30, 2019, 8:22pm UTC](https://community.electricforum.com/t/cascading-7s-121s-bluetooth-bms/15346/1 "2019-01-30T20:22:34Z")
Testing concept of modular 16v battery/bms/monitor These would daisy chain one to the other. 5 making an 80v Gem pack. No setup needed as they come programmed and ready to work. ![3-7s%20casc%20bms](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/6/6ed04737c790ea741601870991797383d5e28d3a.jpeg) ![3-7s%20casc%20bms1](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/6/6dae70dc9fdd2c5c6abdb8d16239405548cb2275.gif) ![5s%20module](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/7/739910a8e391bc5eaddda130fee329170f778587.gif) ![5s%20module2](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/b/b44200f99037a10c84076f129849cbd9aea34539.gif) ![5s%20module3](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/0/0b43fdbeca519ea91637e20fa40fb3db2c2f12cb.gif) Only about $30 each. Interchangeable if one gets damaged. Each optional lcd can display up to 28 cells. Add a bluetooth module to display up to 121 cells. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [January 30, 2019, 8:26pm UTC](https://community.electricforum.com/t/cascading-7s-121s-bluetooth-bms/15346/2 "2019-01-30T20:26:58Z")
Bluetooth monitor. ![5s%20module4](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/f/f159ae62ac0fe45507337927398f4952064ea8f2.gif) ---
**Author:** ![MikeKC](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@MikeKC](https://community.electricforum.com/u/MikeKC)\ **Post date:** [February 1, 2019, 5:56pm UTC](https://community.electricforum.com/t/cascading-7s-121s-bluetooth-bms/15346/3 "2019-02-01T17:56:56Z")
Can you set up battery type, Nano phosphate for example. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [February 1, 2019, 6:57pm UTC](https://community.electricforum.com/t/cascading-7s-121s-bluetooth-bms/15346/4 "2019-02-01T18:57:37Z")
Yes, It has three jumpers on the board. LiIon, Life, and LTO. Sets default settings that work as is. Can also change settings in app to fine tune. Working on a 5 module plug and play solution for Gems. It will work, but bms, wiring, and testing will add $500 to the $1250 battery cost If I do it. This is where I’m at now. ![MVC-012F](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/0/044df99f8be2723be19feddafa73b0813ff08efc.jpeg) 1 of 5 modules. For global balancing and bluetooth, a 4 wire data connection between modules is needed. Simple 4p jst to 4p jst pigtails. The details are killers. Mounting lcd screen etc. Not worth my time. The bt option may be doable. I may make one set for testing, and see if I can make a kit.