REC Master Slave Large Scale Systems

For info on large scale parallel and high voltage series systems

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9M Master 2Q Slave Relays Usage of Relays and or Optocouplers - 9M Master with 3 * REC2Q Slaves - drive 6 contactors through 6 REC Pre-Charge Unit
5/25/25, 12:47 PM • Martin 5/25/25, 12:47 PM

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Martin
5/25/25, 12:47 PM

Use of Relays and Opto-Couplers in Master-Slave configuration: Dear community. I have written my...
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Master - Slave comunnication
4/14/25, 4:50 PM • Jiri 4/21/25, 5:41 AM

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63
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Rick
4/21/25, 5:41 AM

Have you ried connecting directly to the slave with the Wifi Module?
M

Dead REC Master - Dead/Burnt components close to Vcc input
10/20/24, 12:30 AM • Mike 10/20/24, 8:55 PM

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Mike
10/20/24, 8:55 PM

@Rick Thanks Rick. I cleaned it up with alcohol and it appears to be a circuit board fuse, ...
J

Master BMS dead
4/18/24, 9:30 AM • Johan 4/18/24, 11:35 AM

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70
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Rick
4/18/24, 11:35 AM

I can't ever rember a Master failing so we have never had one apart. Grab a Torx#10 a...
A

What is the failure mode when a slave battery is unavailable?
11/7/23, 5:31 PM • Antoine 11/7/23, 7:36 PM

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Rick
11/7/23, 7:36 PM

in a parallel high current Master slave config, each slave controls and monitors its own pack and...
REC Q BMS REC newbie Setting up REC BMS + WakeSpeed 500 + Cerbo GX for marine use
10/18/23, 11:11 AM • Bill C. 10/18/23, 11:11 AM

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44
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Bill C.
10/18/23, 11:11 AM

Hello All, I'm using CALB 230 cells in a custom marine application and am hoping that more exper...
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Victron newbie REC BMS with parallel connection batteries
10/16/23, 3:52 AM • Mihai 10/17/23, 6:08 PM

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79
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Rick
10/17/23, 6:08 PM

Welcome to our User forum :) I have replied in blue below your questions: 1) Is there conter-re...
JR

REC Q BMS 2Q 2 x 24V banks in parallel
9/19/23, 10:02 AM • Jacopo Rufo 9/19/23, 2:51 PM

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Rick
9/19/23, 2:51 PM

and here are a few pics of what a Master/Slave system displays on a Victron Cerbo
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Operating temperature range for 9M slave modules
6/12/23, 3:00 PM • William 6/12/23, 3:00 PM

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William
6/12/23, 3:00 PM

I've got two battery banks each is a Nissan Leaf Gen1 repurposed battery. They been up and runnin...

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REC Master Slave Large Scale Systems

9M Master 2Q Slave Relays Usage of Relays and or Optocouplers - 9M Master with 3 * REC2Q Slaves - drive 6 contactors through 6 REC Pre-Charge Unit
5/25/25, 12:47 PM • Martin 5/25/25, 12:47 PM

Master - Slave comunnication
4/14/25, 4:50 PM • Jiri 4/21/25, 5:41 AM

Dead REC Master - Dead/Burnt components close to Vcc input
10/20/24, 12:30 AM • Mike 10/20/24, 8:55 PM

Master BMS dead
4/18/24, 9:30 AM • Johan 4/18/24, 11:35 AM

What is the failure mode when a slave battery is unavailable?
11/7/23, 5:31 PM • Antoine 11/7/23, 7:36 PM

REC Q BMS REC newbie Setting up REC BMS + WakeSpeed 500 + Cerbo GX for marine use
10/18/23, 11:11 AM • Bill C. 10/18/23, 11:11 AM

Victron newbie REC BMS with parallel connection batteries
10/16/23, 3:52 AM • Mihai 10/17/23, 6:08 PM

REC Q BMS 2Q 2 x 24V banks in parallel
9/19/23, 10:02 AM • Jacopo Rufo 9/19/23, 2:51 PM

Operating temperature range for 9M slave modules
6/12/23, 3:00 PM • William 6/12/23, 3:00 PM

Latest topics

REC ABMS - integration with heltec 4s Active Balancer

WS500 Field Stuck High

Two (related) issues after updating to 2.9.6 firmware

Unable to install WiFi Module SW 1.6.3

TimeToGo additional message for Victron D-BUS

Latest posts

ABMS lilliputian switch

Troubleshooting Unstable ABMS-WiFi Connectivity on Boat

REC ABMS - integration with heltec 4s Active Balancer

REC ABMS - integration with heltec 4s Active Balancer

Two (related) issues after updating to 2.9.6 firmware

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REC Master Slave Large Scale Systems

9M Master 2Q Slave Relays Usage of Relays and or Optocouplers - 9M Master with 3 * REC2Q Slaves - drive 6 contactors through 6 REC Pre-Charge Unit 5/25/25, 12:47 PM • Martin 5/25/25, 12:47 PM

Master - Slave comunnication 4/14/25, 4:50 PM • Jiri 4/21/25, 5:41 AM

Dead REC Master - Dead/Burnt components close to Vcc input 10/20/24, 12:30 AM • Mike 10/20/24, 8:55 PM

Master BMS dead 4/18/24, 9:30 AM • Johan 4/18/24, 11:35 AM

What is the failure mode when a slave battery is unavailable? 11/7/23, 5:31 PM • Antoine 11/7/23, 7:36 PM

REC Q BMS REC newbie Setting up REC BMS + WakeSpeed 500 + Cerbo GX for marine use 10/18/23, 11:11 AM • Bill C. 10/18/23, 11:11 AM

Victron newbie REC BMS with parallel connection batteries 10/16/23, 3:52 AM • Mihai 10/17/23, 6:08 PM

REC Q BMS 2Q 2 x 24V banks in parallel 9/19/23, 10:02 AM • Jacopo Rufo 9/19/23, 2:51 PM

Operating temperature range for 9M slave modules 6/12/23, 3:00 PM • William 6/12/23, 3:00 PM

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Latest topics

REC ABMS - integration with heltec 4s Active Balancer

WS500 Field Stuck High

Two (related) issues after updating to 2.9.6 firmware

Unable to install WiFi Module SW 1.6.3

TimeToGo additional message for Victron D-BUS

Latest posts

ABMS lilliputian switch

Troubleshooting Unstable ABMS-WiFi Connectivity on Boat

REC ABMS - integration with heltec 4s Active Balancer

REC ABMS - integration with heltec 4s Active Balancer

Two (related) issues after updating to 2.9.6 firmware

Forum statistics

Newest members

Sean

ArneS

Martik

Iain

Hans

Most liked authors

Richard

Rick

Trond

Bill C.

Ben

Trond

PeterD

tine

Al

Bill

9M Master 2Q Slave Relays Usage of Relays and or Optocouplers - 9M Master with 3 * REC2Q Slaves - drive 6 contactors through 6 REC Pre-Charge Unit
5/25/25, 12:47 PM • Martin 5/25/25, 12:47 PM

Master - Slave comunnication
4/14/25, 4:50 PM • Jiri 4/21/25, 5:41 AM

Dead REC Master - Dead/Burnt components close to Vcc input
10/20/24, 12:30 AM • Mike 10/20/24, 8:55 PM

Master BMS dead
4/18/24, 9:30 AM • Johan 4/18/24, 11:35 AM

What is the failure mode when a slave battery is unavailable?
11/7/23, 5:31 PM • Antoine 11/7/23, 7:36 PM

REC Q BMS REC newbie Setting up REC BMS + WakeSpeed 500 + Cerbo GX for marine use
10/18/23, 11:11 AM • Bill C. 10/18/23, 11:11 AM

Victron newbie REC BMS with parallel connection batteries
10/16/23, 3:52 AM • Mihai 10/17/23, 6:08 PM

REC Q BMS 2Q 2 x 24V banks in parallel
9/19/23, 10:02 AM • Jacopo Rufo 9/19/23, 2:51 PM

Operating temperature range for 9M slave modules
6/12/23, 3:00 PM • William 6/12/23, 3:00 PM