I recently installed this on my narrowboat. It shows battery voltage and amps in and out.
The Bluetooth works great to my phone.
What is will not do is tell me the state of charge. It always shows no time till discharged and the battery logo as empty.
Everything i read says a 12V lead acid battery fully charged would be 12.6 to 12.7.
Why does Victron use 13.2 Volts as the fully charged voltage. This may be the charging voltage but not the charged voltage.