Victors multiplus does float charge

[Patrick Baghus]

My multiplus does a floatcharge sometimes, but i do not understand why. It then shows a charge of +1-5 to +2 A. 

I have no otter charge source than the gridcharger in the multiplus.

The multiplus Has a setting of 14,2V bulk and 13,5V float.

The sbms0 has:

end of charge at 3,5V

overvoltage at 3,55

Over voltage recovery at 3,4

Undervoltage at 2,8

Undervoltage recovery at 3,2.

Anyone got an idea how to solve this?

[Barry Timm]

Your Type=4 port is not switching off the Multiplus when you manually set the value to "0"?

[Patrick Baghus]

Yes it does turn of when changed to 0.

But when turning it back to 1 again, the charge fet is enabled. The pack is at 13,54V, making the Victor do a float charge.

Should i just lower  the float voltages in the multiplus?

Op zaterdag 28 mei 2022 om 16:13:07 UTC+2 schreef Barry Timm:

[Nils]

Patrick,

unfortunately I can't access my Multiplus at the moment and check for your. But if your EOC ist 3.5 V (which is fine) your pack will be at 14V. 

Did you enable the "Lithium battery" option in VE.Configure on the "Charger" tab? I think I remember this deactivated the float charge all together for me. Otherwise wouldn't you need to raise the float voltage in the Multiplus? So that the system will actually never reach the value? Or am I thinking incorrectly?

Best,

Nils

[Barry Timm]

Both your float and Absorb voltages should be above the maximum battery bank that you'd ever reach, which allows the SBMS0 to cut the charge when it needs to (based on cell level voltage at the SBMS0). For example, on my 24v LFP bank, I have set my Multiplus Absorb and Float voltages to 29v, which can never be reached before the SBMS0 cuts the charging during bulk phase.