BMV712/Battery Protect with thermal sensor (BMS - no low temp)

Long story short,, I have to use this 150ah battery - it's the only one I can find that fits in the space available. The problem, it does not have low-temp protection in its BMS. (it's the 150ah and fits in a group 49 H8 Space)

The Battery Protect (BP) is going to cutoff both the charging and the loads for the battery, when the Victron BMV TEMP sensor goes below 40 degrees. The thermal sensor needs 12v to operate and needs to live in the battery compartment. The issue, if the aux battery is completely dead, the Temp-sensor/BMV will never close the BP. Also, the Charge sources needs to feed the load, when the battery is dead.

Remedy, a supply from the Charge sources will be connected to the Temp-sensor/BMV within the battery compartment. And both loads and sources will be place on the "IN" of the BP.

Question, does this all seem like an okay design? Is there an issue running both loads and charging sources from the "IN" on the BP

RiceJ said:

Battery Protect (BP) is going to cutoff both the charging and the loads

Click to expand...

The Victron battery protect is a one way device, cannot have both loads and chargers on the input. Also no inverter loads are allowed on the protect output.
The Smart Solar can disable charging based on the information from the BMV temperatures sensor. The Victron stuff talks each other, VE network via Bluetooth, except the Orion 30A charger. However this has control pins, H and L, that can control charging.

A useful device for temperature control, use to enable/disable device control inputs,

Mike

Would the KSD301 go directly to the REMOTE port on the Orion? It appears the reset on the KSD is a temp below the active. Is there a model that has a activate/reset of 40 and 50F

Also, would it be possible to use two BP's and put them in series, but in reverse input/output? See crude sketch
One BP would protect for loads, the other for supplies??

The battery protect is to prevent over discharge of the battery by small loads ... not designed for what you want to do.

Q-Dog said:

The battery protect is to prevent over discharge of the battery by small loads ... not designed for what you want to do.

Click to expand...

I think it is indeed being used for low temp protection, using the BMV 712 temp sensor.
Back on topic please.

Use the 712 to disable the chargers below your set temperature. Battery protect not needed for this.

Use the battery protect to cut off small loads when the battery drops below a certain voltage.

Q-Dog said:

Use the 712 to disable the chargers below your set temperature. Battery protect not needed for this.

Use the battery protect to cut off small loads when the battery drops below a certain voltage.

Click to expand...

Can you offer a diagram to do this? Trying to find a way to protect the battery from low-temp LOADS & SUPPLIES, and still offer 12v supply for loads (when cold).

Use the BMV relay port to trigger the remote on/off of the charger.

Q-Dog said:

Use the BMV relay port to trigger the remote on/off of the charger.

Click to expand...

That would not allow supply to loads when cold. I appreciate your willingness to help, but they so far, this is not helping this thread.

RiceJ said:

Would the KSD301 go directly to the REMOTE port on the Orion? It appears the reset on the KSD is a temp below the active. Is there a model that has a activate/reset of 40 and 50F

Also, would it be possible to use two BP's and put them in series, but in reverse input/output? See crude sketch
One BP would protect for loads, the other for supplies??

Click to expand...

Hoping to get this thread back on track

RiceJ said:

Can you offer a diagram to do this? Trying to find a way to protect the battery from low-temp LOADS & SUPPLIES, and still offer 12v supply for loads (when cold).

Click to expand...

The power supply for the 712 will be have to be direct to battery, i.e bypass the battery protect. Then you'll still have 12V to it, even if the battery protect kicks on.

This is a recommend wiring diagram from Victron for protect the battery from Charging/dischargin .. but this would disconnect the CHARGE from the LOADS. No one could run any devices in the cold, even though Orion is ready to supply 30a while driving. I think I'm giving up trying to use the BP as a substitute for a BMS without low-temp protection.