inverter not registering draw on shunt

[Epic-Rob]

ok so my Voltronic shunt is registering draw from lights and deisel heater etc, and also showing charge from solar and DCDC
but when i switch the 1200w victron inverter on with the induction hob (or any load) no draw showing.
what it will do is briefly flick to showing a charge of something like 10a then just revert back to what it was before.
the voltronic shunt is 200a so wont be overloaded by the draw from induction hob.

looking at the pic bellow
the 2 black cables on same term, one of those is coming from the DCDC charger, the other is going to the shunt.
i have the neg cable from the inverter conected directly onto the battery side of the shunt, i have switched it onto the BMS but it didn't make any diff. earth side of shunt is directly to a seat bolt on floor.

poss for inverter is going directly to pos on battery through a mega fuse.

I am sure it will be something simple.......

 

[n10n]

Hi,


You have two black wires on shunt battery side. There should be only one and that should go to the leisure battery negative. Note how even Votronic manual notes that there should not be additional wires connected to the battery negative or shunt battery side.

So, basically your inverter should be connected like the "Load" on the right. But inverter positive is good taken from battery positive - not through any switch due to the large load.

 

[Dellmassive]

The inverter NEG need to be the other side of the shunt. (Shunts work by metering the power through the neg side of the circuit)

Either chassis, or shunt load side, or neg busbar.

As above, the only thing connected to the battery NEG post (effective your BMS NEG OUT as your BMS is external) should be the battery.

So it's.

Cells neg -> BMS cell neg -> BMS NEG out -> shunt neg for battery -> shunt neg to chassis and everything else.

.

 

[Dellmassive]

Fyi

B- is battery neg so goes to your cells NEG.

P- is power NEG so goes to your shunt..... Then on to all your system negs.


.



.

 

[Epic-Rob]

Hi,


You have two black wires on shunt battery side. There should be only one and that should go to the leisure battery negative. Note how even Votronic manual notes that there should not be additional wires connected to the battery negative or shunt battery side.

So, basically your inverter should be connected like the "Load" on the right. But inverter positive is good taken from battery positive - not through any switch due to the large load.
View attachment 203527
View attachment 203530

I did take the inverter wire off here and connected it to the P- it made no diff

Hi,


You have two black wires on shunt battery side. There should be only one and that should go to the leisure battery negative. Note how even Votronic manual notes that there should not be additional wires connected to the battery negative or shunt battery side.

So, basically your inverter should be connected like the "Load" on the right. But inverter positive is good taken from battery positive - not through any switch due to the large load.
View attachment 203527
View attachment 203530

 

[Epic-Rob]

The inverter NEG need to be the other side of the shunt. (Shunts work by metering the power through the neg side of the circuit)

Either chassis, or shunt load side, or neg busbar.

As above, the only thing connected to the battery NEG post (effective your BMS NEG OUT as your BMS is external) should be the battery.

So it's.

Cells neg -> BMS cell neg -> BMS NEG out -> shunt neg for battery -> shunt neg to chassis and everything else.

.

Sorry not quite following you on that. as it is in pic the battery side of shunt has the earth from P- and the earth from the Inverter. there is only the earth strap on the earth side of the shunt.
Are you saying i should have the inverter connected to the other side of the BMS, B- ?

 

[Loz]

Only the shunt should be connected to the battery negative.
All other negatives should be on the other side of the shunt.

 

[n10n]

I did take the inverter wire off here and connected it to the P- it made no diff

Connect your inverter neg either to this terminal in the shunt (com- / Masse-) *or* directly to vehicle chassis

 

[Epic-Rob]

Connect your inverter neg either to this terminal in the shunt (com- / Masse-) *or* directly to vehicle chassis

View attachment 203532

Doesnt that then bypass the shunt?

 

[Epic-Rob]

Only the shunt should be connected to the battery negative.
All other negatives should be on the other side of the shunt.

you mean on the earth strap side of shunt? but wouldn't that then be bypassing the shunt?

 

[n10n]

Doesnt that then bypass the shunt?

No

you mean on the earth strap side of shunt? but wouldn't that then be bypassing the shunt?

Never mind the strap. This side of the shunt is the one that should be connected to vehicle chassis. I just used the strap for that connection.

 

[Loz]

 

[Dellmassive]

from above. .. . .




.

 

[Sim60]

You need to think of the (battery + shunt) as one entity - The positive terminal is the Battery + The negative terminal is the shunt com-

 

[Dellmassive]

so like this . . .

 

[Epic-Rob]

OK will connect like that tomorrow.

Thanks Chaps.

 

[Epic-Rob]

Sorted.
110Ah draw on my 1200w induction hob but i have a 230Ah battery so that will be fine
inverter draws 2.4Ah in standby.
Thanks all

Is an interesting one though because in my other van all loads inc inverter are connected to battery side of shunt and not earth side and it registers fine on the shunt display.