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Victron BMV 702 - No Power?


Stephan
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Hello Everyone


I have been using the following system for the past 8 months with no problem at all. Also to mention that I rarely deplete the batteries lower than 85%.

  •     24v 3kw Devel Pure Sine Inverter with a DC charging current of 20-75A.
  •     2x 12v Narada AGM batteries with a charging current limit of 50A.
  •     Battery Blanacer
  •     Victron BMV 702

All of a sudden this morning the Victron monitor went dead? I checked and all the wiring seems to be intact. Any idea what could cause this?

The batteries system still works fine, its just that I do not have any control over the status.


Thank you
Stephan

Narada.pdf

Inverter LPT-manual-EN.pdf

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Sounds like it isn't getting power.

There's a fuse in the red cable that goes from the battery positive to the shunt. Check that fuse.

Also check the RJ-11 cable running from the shunt to the monitor itself.

I don't know the pinout of the cable, otherwise the obvious check is to measure if there is voltage on the cable where it plugs into the back of the monitor.

The system will continue to work because the shunt is just a low-value high-current resistor and that still works as intended.

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Hi Plonkster

Thank you for the quick feedback.
I wanted to check into the issue over the weekend, but then the monitor suddenly started working again, only to sound off a deviation alarm that the one 12v-battery shows 25v and the other 12v-battery shows only 0,04v. I did reset the monitor to factory settings and did also a full setup again, but the deviation is persistent.

I guess there must be a wiring problem?

I'll do a full checkup tomorrow give feedback if I am still in the dark.

Thank you
Stephan

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  • 2 months later...
On 2/19/2018 at 11:42 PM, plonkster said:

That sounds likely.

Hallo Plonkster

Thanx for the reply some time ago. I went through all the wiring, replaced the fuses coming from the battery and everything started working again.

But unfortunately it completely stopped working a week ago. Looking closely I saw that where the com cable plug is going into the shunt, there most probably dripped rain water on it. Because the com cable plug looks blackish as if there was a short of some sort.

I will replace the com cable plug. If that doesn't work I suppose I will have to replace the shunt as the little board on the shunt then probably got damaged.

Would you by any chance know whether it is possible to buy the shunt or the board on the shunt separately?

Thank you

Stephan

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1 hour ago, Stephan said:

Would you by any chance know whether it is possible to buy the shunt or the board on the shunt separately?

You can buy the shunt separately, item code SHU500050100, but by the looks of it this does not include the connection PCB (which is the bit you want). Though these items are usually well protected in conformal coating, so I'd expect that properly cleaning the connector (use some electrical cleaner from an auto-parts place) or maybe getting someone who's handy with a soldering iron to replace the rj-whatever socket (it's a standard part) ought to do it.

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  • 2 weeks later...
On 2018/05/08 at 1:38 PM, Chris Hobson said:

I have some RJ12  sockets in a drawer somewhere and most computer shops will have a RJ45 crimping tool. The tool usually has RJ11/12 dies too.

Hallo Chris

Thanx for the offer. I’m actually also looking for the RJ12 connector since I’m not sure whether the cable connector itself was damaged?

If you have connectors that would be great since “mantech.co.za” (as suggested by Pilotfish) does not have any in store. 

Ps: Is it possible to replace the socket on the pc board of the shunt?

Regards

Stephan

 

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hi @Stephan, i had to make up a cable between the bmv and the shunt as the distance between the pc and batteries was about 15m. the rj12 connectors are scarce and have to be wired correctly. with help from this forum the attached pdf was drawn for the 10m plus wiring setup, hence the three wire combination to prevent power loss over the extra length of the cable.

re the rj12 connectors i got a couple at a shop in cape town [yebo electronics], just phone around in your valley, you'll find them and they are cheap. i got a crimping tool for less than zar140, so if you need to go that way it is not expensive.

regards

g

bmv kabel settings.pdf

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  • 1 month later...

Hi Everyone

Thank you all again for the feedback.

I obtained n a new cable and sockets with and connected it correctly with the right tool I also bought, but it is still not working.

Since pc board socket has some blackish dust on it like it burned, I will have one last try to clean it by dipping the whole shunt in surgical alcohol and let it dry completely. If that doesn't work I might have to replace the shunt or the pc board fitted on it.

Any idea where I could buy the shunt or maybe just the pc board if it can be removed as a separate piece?

Thank you

Stephan

IMG_0759.jpg

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I recently worked on a similarly damaged shunt, I removed the PC board, cleaned it with electrical cleaner, resoldered what looked like dry joints... and eventually gave up. The one I'm dealing with doesn't show a proper voltage reading. I measured the pin right on the one side (either left or right, I forgot) with a DMM and found a good voltage reading, yet I think the only solution is to replace the RJ-11 socket, at least in my case. Everything else on the board seemed perfectly okay, somehow it just doesn't translate well onto the cable.

An RJ-11 socket like that is like ZAR20 on RS components...

You can buy the shunt separately as SHU500050100. The price list says this does not include the PCB to the 600S/602. It also includes other larger shunts, and for those it indicates that it does not include a PCB for the 700S/702. The PCB for the 600 and 700 differs. So basically I cannot figure out if the shunt includes a PCB... but I think it does. The larger ones doesn't include one (you are to transplant the PCB from your existing shunt). You may have to ask your local reseller. It's 37 Euro.

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12 hours ago, Stephan said:

Since pc board socket has some blackish dust on it like it burned, ...

So, being very very familiar with blackish dust on electronic equipment, I have to ask: How did it get there?

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20 hours ago, The Terrible Triplett said:

So, being very very familiar with blackish dust on electronic equipment, I have to ask: How did it get there?

There is a TTT fairy (related to the Sandman) that comes and sprinkles it at night. Sorry I OD on kid's movies over the weekend. Looks Like this weekend is going a repeat process with the cold weather on the way.

 

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  • 2 weeks later...
On 2018/07/11 at 8:08 AM, Chris Hobson said:

There is a TTT fairy (related to the Sandman) that comes and sprinkles it at night. Sorry I OD on kid's movies over the weekend. Looks Like this weekend is going a repeat process with the cold weather on the way.

 

 

On 2018/07/10 at 11:22 AM, The Terrible Triplett said:

So, being very very familiar with blackish dust on electronic equipment, I have to ask: How did it get there?

I suppose I need to improve my vocabulary :) Well, at least I can account for some entertainment aside from kids movies ;)

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  • 2 weeks later...

Hello everyone

I am "riding the donkey to death" as they would say in afrikaans, so hopefully this will be the last of my questions on this.

Is it possible to buy the PC board alone from the Victron bmv shunt?

I have soldered a new socket on the PC board, made a new cable but stil no power!?

Thank you

Stephan

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3 minutes ago, Stephan said:

Is it possible to buy the PC board alone from the Victron bmv shunt?

Contact OnTrack in Somerset West, and ask to speak to their tech. You can get the PC-board, so I am told, but there is no official order number for it, they special order it. At least as far as I know. They are an authorised repair shop, so they can get hold of some items that don't have an official stock code.

I also tried to repair a BMV 600 board without success.

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