@Dellmassive as you are using quicklins battery monitoring, would you suggest an alternative monitoring device that is compatibile with frogstar app to eliminate to many different apps for monitoring? thx
Which Battery health monitor and drain monitor
- Thread starter Pidsley
- Start date
sure,
a Victron smart shunt on the LB, with the starter battery connected to the 2nd voltage input. (you can use the temp sensor in this configuration)
that way you can monitor both batterys voltage,
SoC% of the LB
power in/out of the LB
voltage logging over time.
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nothing is configurable to the Fogstar APP or other battery's APP like domestic solar, you are stuck with the BMS manufacture APP or the White-label skinned version of the APP.
separate have the most granular data, but the shunt above is very good allrounder.
+++++++
example:
@Dellmassive, this is good idea however would require ground cable to run from starter to shunt too, or do you think that positive sensor would be enough? thx
no the shunt will only monitor the LB current in / out. (plus voltage)
if you connect a small POS wire from the starter battery you can monitor the STARTER Voltage.
so effectively what the two BM2 units would do,
then the shunt will see the power in/out of the LB - the same as what the battery BMS may show.
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eg:
if you connect a small POS wire from the starter battery you can monitor the STARTER Voltage.
so effectively what the two BM2 units would do,
then the shunt will see the power in/out of the LB - the same as what the battery BMS may show.
++++++++++
eg:
on this diagram you still have negative connection going from starter battery to the shunt. Could it be just grounded instead as it is?
in a van install that represents the Chassis.
Hi Delmassive,
A follow-up question on this please. I accept your comment that the T6 already has a VW shunt on the battery neg , but as you also say, its not much use to most of us as we cannot access any info from it except occasional error codes via an OBD code reader.
Therefore my question is "Is there any specific reason why another shunt cannot be added in-series?"
My outline electrical thinking is that the same current will flow through both shunts whether huge currents for starting, "small" currents from the alternator for charging or currents being used by the all the usual van electrical kit.
The only downside I can see so far is that there will be extra joints in the negative connection and therefore there is the possibility of a small (very small) potential difference experienced by the two shunts. Therefore although both shunts will experience nominally the same voltage ranges during vehicle operation, there could be a few millivolts difference.
It seems to me that the VW shunt will still be able to communicate with the battery control module etc, and the Victron Shunt will be able to provide useful direct info to the driver's phone. Personally, I've found Victron kit to be well-engineered quality kit, although rather expensive.
Am I making a schoolboy error and missing something?
There is no technical reason as such, provided you used the appropriate 500A plus shunt and appropriate rated cable for the onwards chassis connection.
However, the new shunt will consume power, which the vans shunt will detect, which will in itself scew the readings...
Most people leave the OEM setup as-is, but monitor the POS side of the battery... Say with a current clamp.
Or even VCDS which gets you access to the OEM shunt data.
Some more info on that here:.
www.t6forum.com
Vcds battery data here,,,
www.t6forum.com
..
Clamp meter stuff here....
www.t6forum.com
...
Example
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However, the new shunt will consume power, which the vans shunt will detect, which will in itself scew the readings...
Most people leave the OEM setup as-is, but monitor the POS side of the battery... Say with a current clamp.
Or even VCDS which gets you access to the OEM shunt data.
Some more info on that here:.
Clamp Meters
Any recommendations for clamp meters? They have been mentioned in a few threads but I can’t find suggested products. Suitable for small mA measurements with dc in the van and elsewhere and also if possible up to mains ac. I’m not sure how much I need to spend for a tolerably decent one with the...
Vcds battery data here,,,
Upgrading Starter Battery - how to guide
My van (April 2017 T28) is fitted with a Moll battery. I am experiencing some issues with it not starting after a few days sitting on the drive. Now this could be due to the tracker I have fitted draining it but I doubt it, I'll do some drain current tests before taking the plunge. If I were to...
..
Clamp meter stuff here....
Clamp Meters
Any recommendations for clamp meters? They have been mentioned in a few threads but I can’t find suggested products. Suitable for small mA measurements with dc in the van and elsewhere and also if possible up to mains ac. I’m not sure how much I need to spend for a tolerably decent one with the...
...
Example
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...
...
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