BMS without cell monitoring

Looking for something? Need a special part, but can't find it online anywhere? Post what you need, maybe others will have it to sell. Guest may post replies to topics already here. All topics here will expire after 60 days of inactivity.
Post Reply
DVDRW   100 W

100 W
Posts: 210
Joined: Sep 10 2012 10:57am
Location: Tallinn, Estonia, EU

BMS without cell monitoring

Post by DVDRW » Mar 10 2018 12:15am

Is there any compact BMS that does not have cell level monitoring? Need only monitoring entire pack voltage and LVC/HVC protection.
Quality new 18650 never get out of balance (over 2 years already). Cheap cell level BMS-es tends to be Battery Murdering System.
If cells not connected it cant be bad for battery.
I expect it to be same price or cheaper than cheapest cell level BMS-es.
Im running not programmable 250W 36v ebike controller @48v so no LVC by controller

User avatar
amberwolf   100 GW

100 GW
Posts: 26014
Joined: Aug 17 2009 6:43am
Location: Phoenix, AZ, USA, Earth, Sol, Local Bubble, Orion Arm, Milky Way, Local Group

Re: BMS without cell monitoring

Post by amberwolf » Mar 10 2018 3:36am

Some thoughts:

From what I can tell, many (maybe most) of the BMS that do have cell level monitoring don't actually check if there's cells connected or not--if the voltage of a cell is low enough, or a sense wire is broken off a cell group, it doesn't trigger the BMS (poor design).

If one of those BMS also has a whole-pack HVC/LVC (many probably don't), you could use it as a pack-only BMS, never connecting the sense wires.

I don't have any lists of which ones do which functions, though. :(

If you're running a Cycle Analyst, you can set it's LVC to decrease throttle (or disable it) below the LVC point. It doesn't have an HVC, though. :/

Post Reply