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Connecting Battery Monitor BMV-712 with Battery Protect BP-100

How can I connect the relay terminal of the BMV-712 battery monitor with a BP-100 battery protect? I want to disconnect the battery in case the capacity of the battery has reach a defined percentage. I only can programm the cut off voltage off the BP-100, but I want to use the capacity information from the BMV-712.

BMV Battery MonitorBattery Protect
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Greetings

I am also interested in connecting my 712 to my 65a SBP via the NC and COM to set a HIGH V. cutoff. I have made connections but not sure where to make the settings in the 712 or whether there are any separate settings in the 712 menu to make. I have done a simple over voltage test from my Smart 30/100 MPPT to the SBP but no cutoff occurred.

Can you please help?

Ty

Krystof

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Stuart answered ·

The battery protect has a High+ and - Connection where the loop is connected.

It it very simple to use. Take the wires out the loop terminal on the battery protect

and run a pair of wires to the back of the BMV-712. Connect one wire to the common

terminal and one to the normally closed.


I understand the BMV uses a bi-stable relay and is a clean pair. This way you can set the

relay to change over when the battery gets low and all your loads will be isolated stopping

any further discharge. In other words you are just using the relay on the battery protect to

switch the main power switch output.


If you are not sure you can draw out a circuit diagram of how you have the system wired

and myself or another member will be able to give you further advice.


I hope that is of help.


Stuart.




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Hello, I am also interested in connecting my 712 to my 65a SBP via the NC and COM to set a HIGH V. cutoff. I have made connections but not sure where to make the settings in the 712 or whether there are any separate settings in the 712 menu to make. I have done a simple over voltage test from my Smart 30/100 MPPT to the SBP but no cutoff occurred.

Can you please help?

Ty

Krystof

I am also quite confused as to how to wire, program a similar system to you and what products are required.


I am looking for a simple but expandable system to work with solar and a lithium battery or two and it has been unclear so far on:

Can the BMV 712/202 included relay/monotor unit protect the battery/s via high point and low point disconnect (overcharge/undercharge). I have read that it wont work on high amp loads so not usefull as a disconnect for under/low charge.


If not, like above then I assume the SBP is needed? will it work for both low and high V/SOC% cuttoff?


If using the victron MMPT can this not just protect the battery/s from over charge via settings to shut off once voltage reached? Can it talk to the BMV and turn off based on SOC% too?


Would it be possible and easy to wire it so that the battery can be discionnected from the output (loads) when depleted, yet still be able to be charged up from the MPPT and still have input(MMPT)/output power(when open) monitoring from the BMV?


It would also be good to possibly expand to be able to also charge off the cars altenator and also be protected from there.


It does seam like it gets quite complicated and expensive for a system which to me would be a very common scenario. Is there not a single device that dioes all of this?

Is there any more feedback on this question. I ask because victron support suggested that I talk to a major distributor in the US about a similar question and I got a different answer. This is what I asked:

I'm looking for a solution that will disable solar-only charging to a 24 volt lithium ion battery at low temperature. I am currently using a Victron BMV-712 to accurately monitor the battery temperature. Can I use the relay on the BMV-712 display monitor to directly manage a Victron BP220 to cut-off charging from the solar panels?

Here's the answer I got:

Yes you can do this easily with a BatteryProtect. The BMV has a relay terminal at the back and you program it to be on or off depending on temperature conditions.




Supply 12 volts to the COM terminal and the NO (normally open) and NC (normally closed) terminals will be ON (normally closed) and OFF (normally open). The conditions of the NO and NC terminals reverses when the alarm condition is met. Take the output of the NC terminal to the Remote connection of a BatteryProtect and then program it for PROGRAM C (lithium) The BatteryProtect will be ON when its remote terminal is +12 volts which will be when there is no alarm.

The BatteryProtect is a one way device has an IN and an OUT terminal for power. In this case solar is the IN and the battery connection is the OUT

This seems to conflict with the answer above and I have been unable (or unwilling due to the conflict) to get this working. Any additional information would be much appreciated.