Lynx BMS - Measure Start battery voltage

DIY
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1

Hi,

I have a 12V marine setup with a Lynx Smart BMS, Lithium Batteri Smart, MulitPlus II, DC/DC, Cerbo GX, GX Tuch and some other components. What I now realize is that I cannot measure the start battery (lead) from the Lynx Smart BMS (as I would do with a standard shunt).

Anyone having a good idea how to measure start battery voltage in a setup with a Lynx Smart BMS? Can the analog I/O on Cerbo GX be used? I want the information to be displayed on the GX Touch.

The start battery are not connected to any of the Victron products, I reuse the old isolator between the alternator, start and consumption batteries.

2

You can not use the analog inputs on the Cerbo as these can take only a low voltage like 3V or 5V.

On my system with Lynx BMS I have a smartshunt measuring DC loads so I use the aux connection on that for the starter battery.

The simplest solution might be to fit a 300A SmartShunt to the starter battery no need to measure the current, just connect one negative terminal to the battery with a small wire and VE Direct to the Cerbo.

3

Thanks, for your respons, not what I hoped for, but confirmed my findings :slight_smile: