REC BMS with parallel connection batteries

• Victron
• newbie

• M

  Mihai

  10/16/23, 3:52 AM

  
  Hello all & greetings from Romania :)
  
  I operating a ~15kwp PV panels, Victron ecosystem (Quatrro 10k, 3 x 250/100 MPPTs, 1 Cerbo, 1 Smart Shunt, 1 Lynx Power In and 1 Lynx distributor, pretty much the whole pack) + 4 VW ID3 batteries (12S cells for each of the 4 battery modules, total capacity ~27kwh), batteries/modules operating at ~48V. As BMS I am using something I am not very confident of (some malfunctions, possibly some some hardware-software issues with them), thus I am in search of a better BMS.
  
  REC BMS is one of the main options I am investigating - in need to manage 4 modules x 12 individual cells, with modules voltage ~48V
  
  Thus I come with a few questions to folks who know REC BMS:
  
  1) Is there counter-recommendation or issue for using REC for parallel connectivity in general or at 48V, in particular? My batteries are directly connected to 'feeding source' via the Victron Bus-Bar.
  
  2) I presume I need to work with a master-slave approach (1 master, 4 slaves), correct?
  
  3) Can REC use the Victron Smart Shunt, or it needs its own shunt?
  
  4) Any additional input with related to my proposed integration mentioned above (Victron, batteries, etc)?
  
  I'd want to use a BMS with as much reliability as possible - maybe give it full control (charge-discharge, absoption-float) in the Victor ecosystem (via its DVCC configs) - as it will be in a family house (wife & 2 kids, thus safety 1st) .

  0 likes 0 likes Liked Like

  ---

  2
  Posts

  56
  Views

  Reply

  ---

• R

  Rick OGM Support Staff

  10/17/23, 6:08 PM

  Welcome to our User forum :)

  I have replied in blue below your questions:

  1) Is there conter-recommendation or issue to using REC for parallel connectivity in general or at 48V, in particular? My batteries are directly connec

  The REC Master Slave setup should work well for your configuration

  2) I presume I need to work with a master-slave approach (1 master, 4 slaves), correct?

  With a total capacity of 27 KW you may be able to use just 1 master and 2 slaves but you would need a way to break apart your 4 1P12S packs to create 2 sets of 2P12S packs

  3) Can REC use the Victron Smart Shunt, or it needs its own shunt?

  Sure, you can easily share your Victron shunt by just putting the REC sense wires across the Victron shunt and adjusting your shunt coefficint in the REC BMS

  4) Any additional input with related to my proposed integration mentioned above (Victron, batteries, etc)? 

  The Victron ecosystem will only recognise a single DC source when using DVCC control, although it can monitor several DC systems and this is where the Master/Slave configuration works well to tie togther all of your packs into one big system

  Good luck with your project!

  0 likes 0 likes Liked Like

  ---