BMS combination with Multiplus II

Announcement - Help us fight the BOTS! Please report all spam including stuff in your inbox!

Maarten

New member
Joined
Mar 14, 2021
Messages
15
I am looking for the how to set up my system, and I am leaning towards using a Victron Multiplus II inverter/charger for my battery system.
However I also want to use a dedicated BMS for monitoring and extra security. The Multiplus II does not look at individual cell voltages, but only at pack level.

When the BMS would detect one of the cells is overcharging and disconnects the pack from charging, is the Multiplus II than still connected to the pack and is the pack than still available to use as a load?
In other words: does a BMS allow for power out of the battery but not in?
 

slimf

Member
Joined
Sep 26, 2017
Messages
178
Yes, a good BMS will stop charging, and allow discharging. I have experience with Batrium, but it’s to basic as far as charging goes - it’s either on or off, unlike say the REC which scales it charging toward the top end. I’d be looking at REC.
 

Maarten

New member
Joined
Mar 14, 2021
Messages
15
Yes, a good BMS will stop charging, and allow discharging. I have experience with Batrium, but it’s to basic as far as charging goes - it’s either on or off, unlike say the REC which scales it charging toward the top end. I’d be looking at REC.
Just to be sure that is when connected like this?:

--------------------------| BMS |---- Battery +
| charger/ |
| inverter |
-------------------------------------- Battery -
 

daromer

Moderator
Joined
Oct 8, 2016
Messages
5,659
A BMS is protection and not a charge controller. With that said you should set up your charger to charge properly so you dont have to disconnect due to critical events.

With that said a few BMS systems can interact with a charger and tell the charger that its time to do something since its reaching critical level. Batrium and Rec can interact with some chargers to tell them to do this.

But once again its generally not needed if you take care of the proper settings and set it up. I have run my system for 5+ years now without a problem and no disconnect due to over charge. Only over discharge have caused an issue once.
 
Top