question

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ralf-ct asked

Fluctuating between Bulk and Absorption

Two weeks ago we installed a 48V 3000 Multiplus II, Cerbo GX and Pylontech US3000C. For two weeks the system functioned without the CAN cable between the Cerbo GX and Pylontech. Charged voltages were at around 50.98V and the system would 'bulk, 'absorb' and 'float'.

Yesterday the correct CAN cable arrived, voltages are now fluctuating between 51.07V and 52.60V. However, the system alternates between 'bulk' and 'absorb', never reaching 'float'. Is this normal? According to remote console the lowest cell voltage is 3.374V, and the highest 3.388V (around 0.014V). Will it stabilize after a few days and 'float'? DVCC is now 'forced on'. Input current limit is 15A (it was 10A without the CAN cable). Should I lower the input current to 10A?

Firmware is v.3.00 on the Cerbo GX and 502 on the MultiPlus.

Many thanks.

Multiplus-IIcerbo gxPylontech
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1 Answer
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derrick thomas answered ·

Now that you have the can connected to the battery, the bms controls charging. There is no "float" anymore. That is a function of the mp when there is not a managed battery connected to the system.

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