question

lehrling avatar image

BMV-712 Smart on VE Smart Network

I have just installed a BMV-712 Smart to my solar system and added it to the network with my SmartSolar MPPT and Smart Battery Sense.

I did not purchase the optional temperature sensor for the BMV as I (and my dealer) believed that the BMV-712 would get temperature from the network, it does not.

The BMV allows for monitoring only one of either start battery, battery temperature or midpoint battery voltage.

Now that I have already wired and set my BMV to monitor battery midpoint, I can no longer have battery temperature, even with the extra optional sensor.

What information does the BMV see and use from the network? Is there any benefit having it connected to the network at all?

Victron – can this be changed in firmware?


BMV Battery Monitor
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wkirby answered ·

The BMV is supposed to provide information to the network. It would provide temperature information to the network if that was the chosen option.
The BMV would have no use for received temperature information over the network. Only the MPPT / chargers would have use for more accurate real time temperature measurements from the BMV if that is what the user has chosen to use that input for.

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Can the BMV not calculate reduced battery capacity as battery temperature decreases?

What information does the BMV see and use from the network?

Is there any benefit having the BMV connected to the network with my installation?


Thank you.




The BMV can indeed adjust battery capacity to temperature.

This reinforces the point that the BMV should (because it is smart) be able to get temperature from the network, just like the MPPT controller can.

Victron – can this be changed in firmware?

From the manual:

The temperature measurement can also be used to adjust battery

capacity to temperature, see section 4.2.5, setting number 68.

The available battery capacity decreases with temperature.

Typically, the reduction, compared to the capacity at 20°C, is 18% at 0°C and 40% at -20°C.

68. Temperature coefficient

This is the percentage the battery capacity changes with temperature, when temperature

decreases to less than 20°C (above 20°C the influence of temperature on capacity is

relatively low and is not taken into account). The unit of this value is “%cap/°C” or percent

capacity per degree Celsius. The typical value (below 20°C) is 1%cap/°C for lead acid

batteries, and 0.5%cap/°C for Lithium Iron Phosphate batteries.

Default 0%cap/°C

Range 0 – 2%cap/°C

Step size 0.1%cap/°C