rec bms Image

rec bms

Connect and activate REC Q BMS to Easysolar 2 GX


As in topic, I have connected the Can cable from REC to VE-Can, have enabled Can-bus BMS, DVCC, SVS and STS.

I cant find anywhere in the Victron software that it sees or tries to connect with the BMS.

Problem 2 is that I cant connect to the REC Q over rs485, have tried their included cable and also with a moxa cable with no luck.

Have tried many different settings on the COM port, but nothing bites. If anyone got some inputs there aswell i would be deeply thankful.

Regards, Stig

stigandresen asked
stigandresen answered ·

5 Answers

REC BMS / Venus GX / BMV 712 Shunt?

I am planning an install with LiFePO4, Victron and the REC BMS. The REC BMS will already hooked up with a shunt on the neg side and will be monitoring the battery. I then plan on having the REC hooked up to the Venus GX. I want to be able to monitor things remotely using the BMV-712. Will the BMV-712 be able to get all of it's info from the REC BMS, via the Venus GX or will I need a secondary shunt on it's neg side of the BMV-712 as well? Additionally, I want to be sure that I will be able to read all the data that the REC BMS is collecting about the bank (including temp) and each individual cell that the BMS is monitoring. Will all of this data be available on the BMV-712 or would I need to forget about the Venus GX and the BMV-712 and use the CCGX instead? Based on certain installation requirements, I'd much prefer the Venus GX/BMV-712 combo, unless my monitoring requirements could not be met.

Thank you.

poppycock asked
nate-costello commented ·

4 Answers

Does the Quattro limit MPPT max voltage?


Have the following setup:

Three 15 kVa Quattros

Four 250/100 Smart solar MPPTs

185 kWh lithium battery bank 16s8p configuration


60 330 watt panels

The battery is configured to have a max volt of 65.6 volt and the MPPTs are configured to charge up to that voltage and they do that if i unplug the comm cable to the Quattros. But as soon as i connect it back the MPPTs are ramped down to zero production. The MPPTs start charging when the voltage is below 64.x isch. My conclusion is that the Quattros are limiting the charging since they are only able to charge with their internal charger up to 64.4 volt. The REC BMS reports that charging can continue at full cream but the Quattros says no for some strange reason.

Any tips on how i can configure the Quattros to not limit the charging voltage in my setup?


arke asked
Daniël Boekel (Victron Energy Staff) commented ·

1 Answer

Victron ccgx - head unit for a REC BMS

Our yacht is set up with 400 AH of lithium batteries. The batteries are charged using 800 watts of solar power through a Victron 100/50 MPPT. I have recently installed a REC battery management system. My plan was to monitor the batteries using a Victron ccgx. Unfortunately the Ccgx won’t recognise the REC BMS. As my MPPT is only a 100/50 model am I required to first of all power the VE Can network with the VE Can power cable. Would appreciate any help please.

Lex Hamill asked
mvader (Victron Energy) answered ·

1 Answer

REC Active BMS for Victron GX - How many contactors ?

This new version of "REC-ABMS for Victron CCGX" communicates with a GX Device using CAN. It sends Max Charge Current & Voltage and Max Discharge Current along with Battery Voltage, Temp & SOC. The GX Device uses DVCC & SVS to control all Inverter / Charger & MPPT Solar controllers to comply with the charging / discharging limits. Ok, so that sounds good, huh? But I also want to have contactors set to voltage levels in case the CAN bus goes down.

The previous version of the BMS suggested just the traditional two contactors - HVD & LVD to provide High Voltage Disconnect of the charge bus and Low Voltage Disconnect of the DC load bus.

But this version offers a Main Contactor for both HVD & LVD for Victron inverter / charger devices. And another Contactor expected to be used for HVD on non-Victron Charging sources. And though it is not shown in this diagram, I am sure they expected a third contactor for LVD to disconnect DC Loads.


Is this genius or overkill?

I questioned the new functionality, and the manufacturer offered to disable it to make it functionally equivalent to the old version. But I am an Engineer, so I tend to think "here is a Solution, now lets go find a Problem..."

Any thoughts appreciated.....



P.S. And....

I was expecting the fail-safe MultiPlus Inverter/Charger control to be made with a Charge Control signal to AUX1 and Discharge Control to T1 with the Assistant loaded "Two wire BMS (016A)"...

But they are suggesting Charge Control using the Assistant "Input Current Limit Control (0142)" and the AUX1 signal. And programming the Inverter's DC Input Low Shutdown voltage for Discharge Control.

Some REC users I have enjoyed reading before: @paulb @drmi @Boekel @Poppycock @Hakon Ingvaldsen @Eirik @Ceri.w

andyalford asked
edvanz commented ·

2 Answers

CCGX CAN BMS Time-to-go field not populating?

I have a REC Active BMS connected via CAN. Everything is working aside from the Time-to-go field which is always "--". I am wondering what CAN message is associated with this field? I imagine the field indicates time to changed when charging, and time to discharged when discharging?

Is there a list of CAN BMS messages used / accepted by the CCGX?



dwesterg asked
mvader (Victron Energy) answered ·

1 Answer

Multiplus Two Signal BMS Questions.

I have a multiplus 12/3000/120 and I'm looking to setup the two signal BMS assistant. I have three questions.

1. I've seen it mentioned that you have to use Aux1 and temp inputs, but when I load the assistant, I see you have the option to use Aux1 and Aux2 (though default is temp). Can I just Aux 2 and still use my temp sensor?


2. I have a Clean Power Auto MiniBMS 7 that has a main normally open contactor that will shut off the entire battery as well as two outputs that are designed for a normally closed relay. So I think I should be able to connect the BMS to the multi and configure it to be closed to turn off the charger (battery full) and turn off the inverter (battery empty). However I'm not sure about feeding 12v to the Multiplus as I've read in other threads it's not recommended. Any suggestions?


HVC turn on – 3.6V per cell
HVC turn off – 3.45V per cell
LVC turn on – 2.9V per cell
LVC turn off – 3.1V per cell

In addition to voltage hysteresis there is also 10 seconds time hysteresis for each threshold, to filter out brief voltage sags/spikes, which could be caused by engine starting or other brief heavy loads.

Cell level protection disconnects the bank if any cell is discharged to 2.6V to prevent battery damage.

Cell level protection disconnects the bank if any cell is overcharged to 3.65V to prevent battery damage.

3. I've heard it's not wise run an inverter through a contactor (which is the main protection for the BMS) is not good. I'm not sure if the inrush current is bad for the contactor (possible welding issues) or the inverter. Would something like this work: and would anyone know if this could be used with other products other than the REC-BMS (not my BMS) since my BMS is switching on the negative? They come in 0.5, 1.5 and 4 second delay versions.

nebulight asked
nebulight commented ·

3 Answers


11 Posts
27 Users

Topic Experts

There are no topic experts for this topic. Participate in the posts in this topic to earn reputation and become an expert.