Multiplus voltage sense connected - but volt drops still there?

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9xsolar asked Nov 14, '20

Multiplus voltage sense connected - but volt drops still there?

I have a Multiplus 48/3000 and BMV 702. Compared to the BMV, there's 0.40v difference (even in idle, no load at all) - in order to correct this, I've connected voltage sense cables to the Multiplus (directly from the battery, fused positive)

However, the difference is still there. How do I check what the voltage value is from sense cable vs main battery cable from vebus and whether the connection is even correct?

Measuring the terminals directly doesn't show the difference (with no loads). I measured the v-sense cables as well (before connecting them) and it seems to display accurately? (i.e from a multimeter).

What else am I supposed to check?

multiplus ve.bus

2 |3000

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Answer 1 · 2021-05-30T07:22:20Z

neeyee answered · May 30, 2021 at 07:22 AM

I have this same issue. There is a roughly 0.5v drop between what battery voltage the inverter sees as displayed on VeConfigure and actual battery voltage.

I have connected the Voltage sense cables to the appropriate terminals but these seem to have no effect on the Multiplus' voltage readings. I even restarted the Multiplus a few times and no improvement in its voltage readings (still off)

The voltage sense terminals that fit into the Multiplus have ferrules about half inch long crimped on them - I am beginning to think I need longer ferrules?

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klim8skeptic ♦ commented · May 30, 2021 at 09:15 AM

I have connected the Voltage sense cables to the appropriate terminals but these seem to have no effect on the Multiplus' voltage readings

Plz tell us you have directly connected the voltage sense wires to the battery terminals.

Not some random place between the battery and multi....

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