Hi,
Maybe somebody can explain voltage readings in the image attached? See marked in red.
I checked all the system with multimeter, and it agrees with Smart Shunt - 53.1V everywhere.
Where does 52.7V come from?
Voltage drop on wiring, fuses, connectors.
Easy to follow with a dvm as long as there is current flowing, not recognizable without current.
Multiplus are notorious for slightly inaccurate voltage measurements.
My easysolar is the same, but only .3v
Considering how fine everyone adjusts the voltages, .3v difference is a lot.
Then which voltage should you go by. The multimeter, or the victron.
Hi @kbb,
The MultiPlus comes with a voltage sense port, are you using it?
If you haven’t wired it in and enabled it in the software when commissioning then it will use the voltage at the battery terminals, which is subject to variation from current, voltage drop and voltage rise.
Hello,
Thanks for answer. I measured voltage everywhere, including Multiplus battery terminals. It was 53.1V
I’m not aware of voltage sense port and did not deliberately enable it. How can I check settings?
There are two relevant sections of the Victron MultiPlus manual
The description of the voltage sense feature,
And the diagram showing where it is;
That voltage sense will be used automatically for the Multi, see if that makes any difference, before we discuss the other options (Shared Voltage Sense settings).
Thanks, now I understand this feature.
No, I did not enable voltage sense and do not have wires connected to sense ports on any of 3 inverters (I have 3 phase system).
I have DVCC disabled. Should I enable it? I use third party batteries (Basen Green), which are declared to be compatible with Victron, but they drop CCL to zero at full charge instead of adjusting CVL.