REC Q Series BMS

Q Series for large, high voltage and redundant systems

34 Topics 3 Followers

J

Maximum Cell Float Voltage Coefficient
10/22/22, 8:26 AM • John 4/28/25, 3:55 PM

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3
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271
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Bill C.
4/28/25, 3:55 PM

The question in this thread does not match the thread title... What is the correct ...
REC Q BMS 2Q SW updates for a 9M managing 2 x Q-BMS house batt system on my sailboat?
4/28/25, 2:17 AM • Bill C. 4/28/25, 2:50 PM

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4
Posts

33
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Bill C.
4/28/25, 2:50 PM

@Rick Admin , As I am considering my options and reviewing the 2Q details, I also need to ensure...
F

BMS does not switch to float
4/9/25, 12:23 PM • Franz 4/22/25, 12:29 PM

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5
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58
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F

Franz
4/22/25, 12:29 PM

Hi everyone,I've been monitoring this behavior and noticed the following:The BMS only switches to...
A

EEprom memory corruption - shutdown
3/16/25, 3:29 PM • Aaron 3/18/25, 4:13 PM

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5
Posts

45
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t

tine
3/18/25, 4:13 PM

What is the BMS Serial and SW version? Send me setting please.
A

Q series BMS Error 15
1/18/25, 8:29 PM • Anthoney 2/20/25, 9:27 AM

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11
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99
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R

Rick
2/20/25, 9:27 AM

Good news! This may help to explain why the BMS was not pulling back the charger output on ...
n

Setting Date and Time
1/9/23, 11:53 AM • nworker 1/4/25, 8:36 PM

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4
Posts

157
Views

Bill C.
1/4/25, 8:36 PM

@nworker becasue there is no real time clock (RTC) on the Q Series, my graphs simply show an incr...
A

2Q REC Master REC Master BMS/2Q Max System Size
10/8/24, 10:27 PM • Austin 10/16/24, 1:08 PM

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2
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113
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Rick
10/16/24, 1:08 PM

Here is some feedback from REC engineering that may address your challenge while giving you a lev...
System Error #3
8/23/24, 10:02 AM • Robert 8/27/24, 11:55 AM

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6
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60
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Robert
8/27/24, 11:55 AM

@Rick Thanks for your recomendations, that works. Take a look at my logging is this fairly normal...
J

2Q firmware update (what happens to settings)
8/6/24, 11:13 AM • Jeffrey 8/9/24, 6:21 PM

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4
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84
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J

Jeffrey
8/9/24, 6:21 PM

FYI -- the CHRG setting (CAN protocol) gets reset on firmware update and that was the reason I lo...
REC Q BMS settings Setting REC Discharge and Charge Current Limits. Need help.
6/12/24, 5:45 PM • Bill C. 7/22/24, 11:01 AM

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4
Posts

187
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Bill C.
7/22/24, 11:01 AM

30 days of data. Does anyone have an idea why my CCL and CVL values are moving around when chargi...
REC-BMS logging basics help
5/17/24, 10:41 PM • Bill C. 5/17/24, 10:41 PM

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1
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80
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Bill C.
5/17/24, 10:41 PM

I was hoping that someone could explain how the REC-BMS logging screen works on the WiFi module. ...
A

Warning: Internal Failure
5/16/22, 10:35 AM • Adam 5/14/24, 3:06 AM

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37
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1.9k
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t

tine
5/14/24, 3:06 AM

Rick and other users gave me thinking about how to change this sound buzzer alarm not to drive th...
e

Silencing the audible alarm
11/24/22, 8:23 AM • edclarke 4/17/24, 4:44 PM

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17
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433
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R

Rick
4/17/24, 4:44 PM

We're happy to help if we can. Please send your serial # to support@ogm-energy.com and we w...
REC Q BMS balancing ? re seeing when the balancing is active using the wifi home page
12/21/23, 3:20 PM • Bill C. 12/21/23, 3:20 PM

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1
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46
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Bill C.
12/21/23, 3:20 PM

Hello All, I have just fired up my REC Q BMS and am accessing it via the WiFi module. I am...
E

Seeing a "PROBLEM WITH SD CARD, LOGGING IS DISABLED" message
10/9/23, 5:04 PM • Eran 11/25/23, 6:46 PM

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7
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181
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E

Eran
11/25/23, 6:46 PM

Thank you, I apprecaite that! Good luck!
J

Victron 2Q REC REC 2Q BMS and Victron
8/22/23, 10:44 AM • Jeremy 8/22/23, 10:44 AM

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1
Posts

173
Views

J

Jeremy
8/22/23, 10:44 AM

This is for anyone else who may have trouble getting the new 2Q to communicate with Victron. ...
T

REC Q Series BMS + WS500 + Victron + charge/discharge control
5/3/23, 9:16 PM • Thomas 6/11/23, 11:53 AM

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6
Posts

172
Views

R

Rick
6/11/23, 11:53 AM

The Cerbo does not provide battery settings functionality for the BMS. You can set up alarm...
S

REC BMS Voltage Setting for clean 100% SOC charge end.
5/4/23, 4:28 AM • Stefan 5/5/23, 6:09 AM

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4
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186
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S

Stefan
5/5/23, 6:09 AM

It looks like in my case, the max pack voltage went over the calculated value by about 1 Volt at ...
S

REC Master 9M - Startup Pieps - CAN Problem
9/26/22, 12:44 AM • Stefan 4/25/23, 12:26 PM

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6
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376
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Rick
4/25/23, 12:26 PM

This is great information. Thanks for sharing!
R

Rec BMS charge and discharge disable
6/24/22, 9:48 AM • Robin 3/16/23, 11:26 PM

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22
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2.7k
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B

Ben
3/16/23, 11:26 PM

Quote from bonsys on March 16, 2023, 12:19 pm I have a general observation to share. After ins...
P

Shunt reading 2.5x lower than actual current
1/22/23, 2:49 PM • Peter 1/22/23, 2:53 PM

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2
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172
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Peter
1/22/23, 2:53 PM

here is a screenshot from the VRM console showing the difference in the current readings.
s

Minimal connections to safely communicate w/BMS
1/9/23, 8:12 AM • skrap 1/14/23, 4:19 AM

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3
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207
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s

skrap
1/14/23, 4:19 AM

Rick, I have the official REC cable. Will the BMS power on and be responsive if the only conn...
f

Can REC Q BMS communicate to Victron Lynx Distributor?
5/18/21, 8:40 PM • fpat99 11/29/22, 12:53 PM

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4
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1.4k
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Jon
11/29/22, 12:53 PM

The Lynx Distributor uses an I2C bus to relay the 4 fuses and positive busbar state. Up to 4 dist...
n

Charging Questions SunnyIsland 5048U
10/19/22, 2:30 PM • nworker 10/19/22, 2:30 PM

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1
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237
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nworker
10/19/22, 2:30 PM

With the WiFi module (1.6) and the REC-BMS (2.8) configured, I have a couple of questions My u...
R

REC BMS supported inverters
6/23/22, 6:17 AM • Richard 10/17/22, 3:59 PM

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8
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1.2k
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Richard
10/17/22, 3:59 PM

Here is the DB9 pinout from the BMS. Just grab a DB9 connector, a 120 ohm resistor and a phone p...
D

REC Q BMS firmware
4/4/22, 3:03 PM • David 4/6/22, 1:43 PM

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3
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1.5k
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Richard
4/6/22, 1:43 PM

Hi David, the first one is just the software release info. The latest firmware revision is ind...
D

Connecting REC Q BMS to Sunny Island 6048-US Inverter
3/7/22, 6:54 AM • David 4/2/22, 7:37 AM

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6.2k
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David
4/2/22, 7:37 AM

I know what to do now and that makes sense. I will rewire it like you suggested. Thanks!
M

Wrong voltage measurement on most positive cell
1/21/22, 1:34 AM • Marius 1/21/22, 8:47 AM

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5
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856
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Richard
1/21/22, 8:47 AM

Just realized, the Active BMS has fuses that are user replaceable but the Q series does not.
e

REC Q Series vs. Victron specific BMS
11/8/21, 8:10 AM • edclarke 1/17/22, 7:23 AM

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7
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1.6k
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Richard
1/17/22, 7:23 AM

On the network diagram please note that Terminators are NOT required on the VE.bus network. Up...
A

Day 2, BMS Temperature Faults
12/3/21, 10:20 AM • Adam 12/3/21, 11:21 AM

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5
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837
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A

Adam
12/3/21, 11:21 AM

Quote from Rick-admin on December 3, 2021, 3:56 pm Give it a few days to try to get itself bal...
b

Can Bus connection to SI-6048
11/16/21, 1:24 PM • bob 11/25/21, 12:39 AM

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10
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1.9k
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Richard
11/25/21, 12:39 AM

Bob, I was able to replicate your error but only by using small letters then pressing \"Enter\...
N

REC Q incorrect (high) Voltage sense on most positive cell (Cell 8)
4/12/21, 9:58 AM • Nathaniel 9/28/21, 7:17 AM

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7
Posts

1.5k
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R

Richard
9/28/21, 7:17 AM

Just a note to all. The resistor test battery simulator described above will work with the Q Ser...
R

How does the REC BMS interface with a Sunny Inverter?
1/24/21, 7:25 AM • Richard 1/24/21, 7:28 AM

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2
Posts

2.1k
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Richard
1/24/21, 7:28 AM

Basically the BMS passes several parameters back to the Inverter via CANBus which allow the 2 uni...
R

REC Q BMS Startup problems
10/21/20, 8:28 AM • Richard 10/21/20, 8:39 AM

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4
Posts

2k
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Richard
10/21/20, 8:39 AM

Hi, Good news on progress! Tks for the feedback. I have attached an overall screen-shot of...

REC Q Series BMS

Maximum Cell Float Voltage Coefficient 10/22/22, 8:26 AM • John 4/28/25, 3:55 PM

REC Q BMS 2Q SW updates for a 9M managing 2 x Q-BMS house batt system on my sailboat? 4/28/25, 2:17 AM • Bill C. 4/28/25, 2:50 PM

BMS does not switch to float 4/9/25, 12:23 PM • Franz 4/22/25, 12:29 PM

EEprom memory corruption - shutdown 3/16/25, 3:29 PM • Aaron 3/18/25, 4:13 PM

Q series BMS Error 15 1/18/25, 8:29 PM • Anthoney 2/20/25, 9:27 AM

Setting Date and Time 1/9/23, 11:53 AM • nworker 1/4/25, 8:36 PM

2Q REC Master REC Master BMS/2Q Max System Size 10/8/24, 10:27 PM • Austin 10/16/24, 1:08 PM

System Error #3 8/23/24, 10:02 AM • Robert 8/27/24, 11:55 AM

2Q firmware update (what happens to settings) 8/6/24, 11:13 AM • Jeffrey 8/9/24, 6:21 PM

REC Q BMS settings Setting REC Discharge and Charge Current Limits. Need help. 6/12/24, 5:45 PM • Bill C. 7/22/24, 11:01 AM

REC-BMS logging basics help 5/17/24, 10:41 PM • Bill C. 5/17/24, 10:41 PM

Warning: Internal Failure 5/16/22, 10:35 AM • Adam 5/14/24, 3:06 AM

Silencing the audible alarm 11/24/22, 8:23 AM • edclarke 4/17/24, 4:44 PM

REC Q BMS balancing ? re seeing when the balancing is active using the wifi home page 12/21/23, 3:20 PM • Bill C. 12/21/23, 3:20 PM

Seeing a "PROBLEM WITH SD CARD, LOGGING IS DISABLED" message 10/9/23, 5:04 PM • Eran 11/25/23, 6:46 PM

Victron 2Q REC REC 2Q BMS and Victron 8/22/23, 10:44 AM • Jeremy 8/22/23, 10:44 AM

REC Q Series BMS + WS500 + Victron + charge/discharge control 5/3/23, 9:16 PM • Thomas 6/11/23, 11:53 AM

REC BMS Voltage Setting for clean 100% SOC charge end. 5/4/23, 4:28 AM • Stefan 5/5/23, 6:09 AM

REC Master 9M - Startup Pieps - CAN Problem 9/26/22, 12:44 AM • Stefan 4/25/23, 12:26 PM

Rec BMS charge and discharge disable 6/24/22, 9:48 AM • Robin 3/16/23, 11:26 PM

Shunt reading 2.5x lower than actual current 1/22/23, 2:49 PM • Peter 1/22/23, 2:53 PM

Minimal connections to safely communicate w/BMS 1/9/23, 8:12 AM • skrap 1/14/23, 4:19 AM

Can REC Q BMS communicate to Victron Lynx Distributor? 5/18/21, 8:40 PM • fpat99 11/29/22, 12:53 PM

Charging Questions SunnyIsland 5048U 10/19/22, 2:30 PM • nworker 10/19/22, 2:30 PM

REC BMS supported inverters 6/23/22, 6:17 AM • Richard 10/17/22, 3:59 PM

REC Q BMS firmware 4/4/22, 3:03 PM • David 4/6/22, 1:43 PM

Connecting REC Q BMS to Sunny Island 6048-US Inverter 3/7/22, 6:54 AM • David 4/2/22, 7:37 AM

Wrong voltage measurement on most positive cell 1/21/22, 1:34 AM • Marius 1/21/22, 8:47 AM

REC Q Series vs. Victron specific BMS 11/8/21, 8:10 AM • edclarke 1/17/22, 7:23 AM

Day 2, BMS Temperature Faults 12/3/21, 10:20 AM • Adam 12/3/21, 11:21 AM

Can Bus connection to SI-6048 11/16/21, 1:24 PM • bob 11/25/21, 12:39 AM

REC Q incorrect (high) Voltage sense on most positive cell (Cell 8) 4/12/21, 9:58 AM • Nathaniel 9/28/21, 7:17 AM

How does the REC BMS interface with a Sunny Inverter? 1/24/21, 7:25 AM • Richard 1/24/21, 7:28 AM

REC Q BMS Startup problems 10/21/20, 8:28 AM • Richard 10/21/20, 8:39 AM

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Latest topics

VRM Remote - "Remote Charging = NO" always when using WS-500 running fw 2.6.1 - but still charges ok

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Usage of Relays and or Optocouplers - 9M Master with 3 * REC2Q Slaves - drive 6 contactors through 6 REC Pre-Charge Unit

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Latest posts

Charging Rates

VRM Remote - "Remote Charging = NO" always when using WS-500 running fw 2.6.1 - but still charges ok

Charging Rates

VRM Remote - "Remote Charging = NO" always when using WS-500 running fw 2.6.1 - but still charges ok

Charging Rates

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Maximum Cell Float Voltage Coefficient
10/22/22, 8:26 AM • John 4/28/25, 3:55 PM

REC Q BMS 2Q SW updates for a 9M managing 2 x Q-BMS house batt system on my sailboat?
4/28/25, 2:17 AM • Bill C. 4/28/25, 2:50 PM

BMS does not switch to float
4/9/25, 12:23 PM • Franz 4/22/25, 12:29 PM

EEprom memory corruption - shutdown
3/16/25, 3:29 PM • Aaron 3/18/25, 4:13 PM

Q series BMS Error 15
1/18/25, 8:29 PM • Anthoney 2/20/25, 9:27 AM

Setting Date and Time
1/9/23, 11:53 AM • nworker 1/4/25, 8:36 PM

2Q REC Master REC Master BMS/2Q Max System Size
10/8/24, 10:27 PM • Austin 10/16/24, 1:08 PM

System Error #3
8/23/24, 10:02 AM • Robert 8/27/24, 11:55 AM

2Q firmware update (what happens to settings)
8/6/24, 11:13 AM • Jeffrey 8/9/24, 6:21 PM

REC Q BMS settings Setting REC Discharge and Charge Current Limits. Need help.
6/12/24, 5:45 PM • Bill C. 7/22/24, 11:01 AM

REC-BMS logging basics help
5/17/24, 10:41 PM • Bill C. 5/17/24, 10:41 PM

Warning: Internal Failure
5/16/22, 10:35 AM • Adam 5/14/24, 3:06 AM

Silencing the audible alarm
11/24/22, 8:23 AM • edclarke 4/17/24, 4:44 PM

REC Q BMS balancing ? re seeing when the balancing is active using the wifi home page
12/21/23, 3:20 PM • Bill C. 12/21/23, 3:20 PM

Seeing a "PROBLEM WITH SD CARD, LOGGING IS DISABLED" message
10/9/23, 5:04 PM • Eran 11/25/23, 6:46 PM

Victron 2Q REC REC 2Q BMS and Victron
8/22/23, 10:44 AM • Jeremy 8/22/23, 10:44 AM

REC Q Series BMS + WS500 + Victron + charge/discharge control
5/3/23, 9:16 PM • Thomas 6/11/23, 11:53 AM

REC BMS Voltage Setting for clean 100% SOC charge end.
5/4/23, 4:28 AM • Stefan 5/5/23, 6:09 AM

REC Master 9M - Startup Pieps - CAN Problem
9/26/22, 12:44 AM • Stefan 4/25/23, 12:26 PM

Rec BMS charge and discharge disable
6/24/22, 9:48 AM • Robin 3/16/23, 11:26 PM

Shunt reading 2.5x lower than actual current
1/22/23, 2:49 PM • Peter 1/22/23, 2:53 PM

Minimal connections to safely communicate w/BMS
1/9/23, 8:12 AM • skrap 1/14/23, 4:19 AM

Can REC Q BMS communicate to Victron Lynx Distributor?
5/18/21, 8:40 PM • fpat99 11/29/22, 12:53 PM

Charging Questions SunnyIsland 5048U
10/19/22, 2:30 PM • nworker 10/19/22, 2:30 PM

REC BMS supported inverters
6/23/22, 6:17 AM • Richard 10/17/22, 3:59 PM

REC Q BMS firmware
4/4/22, 3:03 PM • David 4/6/22, 1:43 PM

Connecting REC Q BMS to Sunny Island 6048-US Inverter
3/7/22, 6:54 AM • David 4/2/22, 7:37 AM

Wrong voltage measurement on most positive cell
1/21/22, 1:34 AM • Marius 1/21/22, 8:47 AM

REC Q Series vs. Victron specific BMS
11/8/21, 8:10 AM • edclarke 1/17/22, 7:23 AM

Day 2, BMS Temperature Faults
12/3/21, 10:20 AM • Adam 12/3/21, 11:21 AM

Can Bus connection to SI-6048
11/16/21, 1:24 PM • bob 11/25/21, 12:39 AM

REC Q incorrect (high) Voltage sense on most positive cell (Cell 8)
4/12/21, 9:58 AM • Nathaniel 9/28/21, 7:17 AM

How does the REC BMS interface with a Sunny Inverter?
1/24/21, 7:25 AM • Richard 1/24/21, 7:28 AM

REC Q BMS Startup problems
10/21/20, 8:28 AM • Richard 10/21/20, 8:39 AM