Something wrong shows 7.6 volts

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bscheube asked Jan 31, '20

Something wrong shows 7.6 volts

Just installed bvm712 smart exactly as shown in figure 3 both with and without the auxiliary battery and the voltage shows 7.6 volts bounces back and forth to 7.9 volts percent SOC shows 90 percent and goes down to 40 percent like a stop watch. Then looses blue tooth signal and counts down again over and over. Current bounces around at -570 to -580. Power bounces around -3984 to -4800. Consumed amp hours stays at 110. Time remaining stays at 0.

Volt meter shows battery at 13.47 volts.

Any ideas? Faulty out of box?

The only thing I changed in the setup was amp hours of battery to 110

Thanks Bob

VictronConnect

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Modifications Space

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Answer 1 · 2020-02-01T00:22:04Z

klim8skeptic answered · Feb 01, 2020 at 12:22 AM

Please check the bmv fuse, it should be 1a.

Then check the voltage at the shunt.

Are you using the rj12 communications cable that came with the unit, unmodified?

Remove it, and reinsert it and make sure it is fully pushed in and locked with clear contacts.

4

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bscheube commented · Feb 01, 2020 at 10:54 PM

Cannot find a 1 amp replacement fuse. Do I need to change the whole inline fuse wire and fuse holder. Only fuses I found in 1 amp are bigger diameter and longer.

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klim8skeptic ♦ bscheube commented · Feb 02, 2020 at 03:24 AM

Hi B,

It is a regular M205 (20 x 5 mm sized) quick blow fuse.

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bscheube klim8skeptic ♦ commented · Feb 02, 2020 at 06:03 PM

Where can I purchase the fuse? The only place I can find them is online. Wanted to just pick one up without the delay in ordering.

Why do they install a 100mA 250v (.1A fuse) when it requires a 1A fuse to make it work?

Again thanks for the help

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klim8skeptic ♦ bscheube commented · Feb 03, 2020 at 11:36 AM

The wrong fuse was a manufacturing/packaging error.

Please contact the retailer who you purchased your BMV form, and have a discussion.

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Answer 2 · 2020-02-01T18:59:17Z

bscheube answered · Feb 01, 2020 at 06:59 PM

Thanks klim8skeptic,

The fuse is 100ma (.1a) so I need to get a 1 amp fuse and try. ( if this is needed why is it not shipped or in the instructions? Just asking.).

Voltage on both sides of the shunt are the same as the battery. I also checked through the fuse to the shunt and it is the same.

The cable is the original that was with the monitor and I reseated both ends.

I will update in a few hours after I purchase the 1 amp fuse.

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Answer 3 · 2020-02-03T18:46:36Z

bscheube answered · Feb 03, 2020 at 06:46 PM

Thanks will do

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