Battery monitor with bluetooth and shunt

I may be wrong, but you get ONE shunt and you put it in the domestic bank.
You can measure another bank (ie. starter) with some of the Victrons.

been a year since I installed mine, but it was a one output job.

cheers

V.
 
simonfraser said:
Looking at this
https://www.victronenergy.com/battery-monitors/bmv-712-smart

My KAD44 EDC needs more than 500A to start, so if i use my 2 house batteries (500CCA each) to start i will need a 1000A shunt ?
And never having used a shunt, guess you can start an engine through one ??

Normally i would start my KAD from two parallel red tops.
Click to expand...

Use a Hall effect shunt, they measures the magnetic field around the cable, not the current passing through it, so you cannot overload them when starting engine.

Brian
 
Er, we have whatever shunt came with the kit.
I didn’t specify anything other than standard so I assume it is.

Our kit has the shunt attached to the domestic bank, not the engine start bank which is how VictronConnect tell you to install it
 
Whitelighter said:
Er, we have whatever shunt came with the kit.
I didn’t specify anything other than standard so I assume it is.

Our kit has the shunt attached to the domestic bank, not the engine start bank which is how VictronConnect tell you to install it
Click to expand...

Yes, Jez you have connected it the way we did.
However, I understand simonfraser's point.
I'm not sure that the shunt that comes with the Victron would cope with the large loads you get when starting an engine.
Victron supply a separate input for the battery voltage but, interestingly, don't provide a shunt for the engine battery circuit.
To me, that means the shunt wouldn't cope with the engine starting currents.

@simonfraser
Are your engine and house batteries the same bank?
If they are separate banks, the battery monitor's shunt connects to the house bank.
And you can monitor the engine bank with the Victron unit like Jez and I have done.
If you only have one battery bank, you will have to ask Victron if the monitor's shunt will take the engine start load.
 
Two red tops and two Trojans, both wired in parallel.
3 switches, so i can x over or combine the lot.
Shunt is going on the Trojans, want to keep the option of using those to start the KAD if needed.

I did email Victron in Holland, said i could order the 1k shunt from my uk supplier.
Hmm, i asked 2 UK suppliers, no go.

Not familiar with shunts, i ass u me that a 1k shunt is ok to start a KAD 44 ??
 
Don't confuse battery cca and the actual amps the starter motor will draw, you may have 1000cca battery capacity but the chances are you will only draw 200-300 amps (An educated guess and that will depend on engine and temp - winter will be a little higher).
You need to buy, steal or borrow a clamp ammeter to find current draw when cranking then add some to give a safety margin.
 
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