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northernlightss avatar image
northernlightss asked

BMV 712 Smart Monitor dosnt work

Hey ,

I have Problems with my BMV 712 . Im Sure that i haf install everything correct, but the Monitor dosnt work.

Energy flows.

The battery Pol of the Shunt is connected with the minus Pol and the load Site of the Shunt is connected to the System ground.

+B1 -> Battery1 +, +B2 -> Battery2 +

I send the Monitor back, but the seller says it Works. He Send another Shunt, Same Problem ...

I Switch the phone cable, still nothing.

I tyried ist with other cables for the +B1/B2, also nothing.


now i Test the „Energy Flow“.

Shunt - to Shunt +B1/B2 has no Connection, i was mit able to get the 12.8V.

Anybody and idea ? What did i wrong?

Sorry for my english, thanks for help !

BMV Battery MonitorinstallationHelpbattery system voltage
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6 Answers
ejrossouw avatar image
ejrossouw answered ·

Hi @Northernlightss It looks wired ok, but I cannot see clearly. There should only be one negative lead from bat > shunt & shunt > chassis. It looks like you split it off?

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bruces avatar image
bruces answered ·

Exactly where is that red probe of the multimeter inserted/touching?

Neg to neg will show 00000 volts.

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northernlightss avatar image
northernlightss answered ·

The red Probe of the Multimeter is inside the +B1 Pole of the Shunt, the black on the minus Pol of Shunt and on the Battery minus Pole.

Shunt minus to Shunt minus 12.8v, Shunt to System ground/minus Battery -12.8V


@BruceS

Shunt

Battery Pol of Shunt -> Battery Minus

„Load“ Pol of Shunt-> to a System ground Splitter

System Ground Splitter -> direct to System ground and minus Pol‘s other divices, everything works there, Energy flows. ( i also Did it with a direct Connection vom „load“ to System ground, didn’t work.

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Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

Check the fuse inside the wire from battery + to B1+.

To measure the voltage from B1+ to - without a wire connected to B1+ makes no sense.

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northernlightss avatar image northernlightss commented ·

Danke für die Antwort, wärst du so gut und würdest mit das nochmal genau auf deutsch schreiben ? Ich möchte nichts falsch machen

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assimo avatar image
assimo answered ·

In mine the fuse had gone during setup. And it didn’t visually look like it had.

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loop76 avatar image
loop76 answered ·

Hi northernlightss, hast das Problem gelöst??? Ich habe genau das gleiche Problem, wie du beschrieben hast

Grüße

Stefan

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·
Hier wurden ja einige Dinge diskutiert, was würde denn schon alles getestet?
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loop76 avatar image loop76 Matthias Lange - DE ♦ commented ·

Unten ein Bild vom Aufbau, ich sehe hier keinen Fehler. Der Shunt leitet die Masse durch, an B1 + B2 liegt die jeweilige Batteriespannung voll an, jedoch zeig das Display keine Reaktion. Am Masseverteiler ist jetzt die ursprüngliche Leitung der Batterie angeschlossen, und die Masse vom Solarregler.

1.jpg

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klim8skeptic avatar image klim8skeptic ♦ loop76 commented ·
Your solar negative connection has bypassed the shunt.

RTFM.

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loop76 avatar image loop76 Matthias Lange - DE ♦ commented ·
Habe bisher alles getestet was oben beschrieben wurde. Ich denke entweder ist es das RJ 12 Kabel, oder das Display selber hat einen Fehler.


Wie kann ich das testen, bzw. beim RJ12 Kabel auf welchem Pin sollte strom anliegen. Kann ich am display am RJ12 Anschluss was messen ???
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