The smart shunt of the BMV 712 comes with 2 midpoint sensor cables to be plugged into the shunt. How do I connect these if I have THREE (3) AGM batteries wired parallel?
My guess: one to the first battery, the other one to the last, none to the middle battery. Correct?
Thanks for any advice!
Are you sure you have two temperature sensors, the BMV712 comes with two voltage sense wires, one to connect to the battery bank you are sensing and a second one if you want to measure a second battery such as engine start. Have you read the quick start guide, useful diagrams for installation.
see https://www.victronenergy.com/battery-monitors/bmv-712-smart#quick-installation-guide, go down to download and select quick start guide.
Oops - I couldn't remember anymore WHAT the 2 cables are for, so you might be right that they are voltage sense wires. But then I'm referring to IMAGE #12 in the manual:
Monitoring the midpoint of a battery bank! How do I do this with 3 batteries?
(The BMV is in my camper, which isn't near my home and laptop, so I wrote from memory... It's also not the only thing I have to deal with today. I will try to edit the original post to correct it.)
Mid voltage is only if you have a 24V battery bank made up from 2 x 12V batteries in series so you measure the 24V with one wire and the 12V with another. If you have an RV I guess you have a 12V system with your batteries in parallel so you use one cable connected to the 12V positive of any of the 3 batteries and you will not use the mid point. Remember, 3 batteries in parallel have the same voltage so you only need to measure once. The only other thing you can do with the second cable is measure the engine battery with it by connecting it to the positive terminal on that.
