48V Battery bank not entering float/rest voltage

Hello

My 48V battery bank doesn't seem to be go into a float/rest voltage after reaching 56V as configured by the MPPT controller.

The bank will continue to sit at 56.0V all day. Little worried as bank does not get to rest after full charge.

My system configuration-

Victron Cerbo GX
Victron MPPT 250/85 VE/MC4
Victron Mulitplus-II 48/5000

2 x 48V 100AH Lithium batteries (Total ~20KWH)

DVCC Enabled
Shared Voltage Sense - Enabled
Shared Current Sense - Enabled

The Charge Voltage Limit (CVL) setting that is hard coded for the batteries - visible from BMS Cerbo/Touch screen is 56.0V

Picture of Victron MPPT Configuration

Any advice/suggestions appreciated

2 |3000

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seb71 commented · Sep 04, 2023 at 06:04 PM

Are you using ESS?

!6-cell battery, going by the voltages.

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hybridizd seb71 commented · Sep 04, 2023 at 06:08 PM

ESS is disabled

Yes I believe they are 16 Cell batteries

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seb71 hybridizd commented · Sep 04, 2023 at 06:24 PM

ESS is disabled

You mean not used, right?

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What is the state of the MPPT when the battery voltage reaches and then holds 56V?

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hybridizd seb71 commented · Sep 04, 2023 at 06:30 PM

yes ESS is not being used. The assistant is not installed.

The state of MPPT is Absorption, sits there all day at ~56.0V

Does not go into float @ 54V

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seb71 hybridizd commented · Sep 04, 2023 at 06:46 PM

What BMS is that?

Can it be used with DVCC enabled?

For troubleshooting, you could disconnect the MPPT from Cerbo, so that it charges by its own algorithm. See if in this case it changes states (and voltages) as expected.

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