Where do you fit the shunt for the Victron BMV 712, I want it as near to the battery as possible, but the battery tub (in the hab floor) is plastic so won't support the weight or dissipate the heat without possibly melting the plastic ?
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
It should be the first connection from the negative side of your battery then all other negatives from the shunt, the shunt shouldn't get hot enough to melt plastic and has feet to mount it.Where do you fit the shunt for the Victron BMV 712, I want it as near to the battery as possible, but the battery tub (in the hab floor) is plastic so won't support the weight or dissipate the heat without possibly melting the plastic ?
If the battery was upright that wouldn't be a problem, but it looks like it will be on it's side due to battery being too tall for the box (under floor) and am not sure about it hanging down from the post - possibly OK if bolted direct via the mate bolt.It should be the first connection from the negative side of your battery then all other negatives from the shunt, the shunt shouldn't get hot enough to melt plastic and has feet to mount it.
Subscribers do not see these advertisements
It measures current. If you add up all your current used over time, you can see how much charge you've used. It's a much more accurate way of estimating how much is left in your battery than just using the voltage.Could someone explain the purpose of a shunt please?
Mount the shunt next to the battery just use a battery lead from the battery post to the shunt then connect the negatives to the opposite side of the shunt if you have to many cables use a busbar.If the battery was upright that wouldn't be a problem, but it looks like it will be on it's side due to battery being too tall for the box (under floor) and am not sure about it hanging down from the post - possibly OK if bolted direct via the mate bolt.
Mount the shunt next to the battery just use a battery lead from the battery post to the shunt then connect the negatives to the opposite side of the shunt if you have to many cables use a busbar.
If you don't, you will run the risk of a trip to A & E.View attachment 685350
At the moment I've only got the negative to the Elektroblok. But in the future I'll be adding a B2B and a different AC charger in there.
(And doing something about that screw)
Subscribers do not see these advertisements
Quite interested in your setup. What make is the fuse box and isolator.
Yes isolator does the leisure battery the busbar and fuse holder is a victron power in.Quite interested in your setup. What make is the fuse box and isolator.
Is the isolator used to isolate the leisure battery ?
Have you got the yellow and white voltage sense wires from the shunt the opposite way round? You could try swapping them to reverse the charge/discharge direction.Works fine but instead of saying charge it says discharge when I've got engine running or plugged in. It says it at a rate I would expect to see having 20 years of experience of using these things. My BM1 has only been in since Friday so I expect its still learning. I've also not had a good play with the settings yet but anyone see an issue I'm not seeing?
I'll have a check. thanks.Have you got the yellow and white voltage sense wires from the shunt the opposite way round? You could try swapping them to reverse the charge/discharge direction.
Subscribers do not see these advertisements
thanks for that, I did indeed have the yellow and the black and white added on the shunt at the wrong place, should have been the other way round. However, lost a screw in the battery box when I changed it, 2 min job ended up with battery out all cables off kind of day but now all sorted.Have you got the yellow and white voltage sense wires from the shunt the opposite way round? You could try swapping them to reverse the charge/discharge direction.
Apologies, you are correct, was thinking parallel but drew series on original postFirst priority: if your two 100Ah batteries are in parallel, as I expect they are, then the diagram is definitely wrong. If you connect them like the diagram - in series - you will cause a lot of expensive damage to all the habitation electrics.
Subscribers do not see these advertisements
I was thinking more like the attached?On the negative side, you can either link both negatives together, then connect one of the negatives to the shunt. Or connect both battery negatives to the shunt with separate links. Both methods will work fine, but the second way, with separate links, is slightly preferable in terms of voltage drop. The thicker the wire, the less it matters.
On the positive side, it's similar. You can link both positives together, then connect one of the positives to a nearby fuse. Or connect both battery negatives to the fuse with separate links. Again, both methods work fine, but the separate links method is slightly preferable in therms of voltage drop. There's no fuse in your diagram, but I presume that's just an oversight. All wires from a battery positive should have a fuse very near the battery.
The shunt requires a thin positive wire from one of the batteries, doesn't matter which one. This supplies the tiny amount of power the shunt circuit requires, and allows the shunt to measure the battery voltage too. A small fuse is required on this thin wire, maybe 2A.
Any new negative wires should be the same as the old wires, or thicker, because they are carrying the full current to the battery.
Its take the high load current through it and take a small reading from it for the ammeterCould someone explain the purpose of a shunt please?
Subscribers do not see these advertisements