Quick question, the Battery SOC Is 60%, there is enough solar power and charging from grid is also possible (at low energy prices), what could cause the fact the Multi RS Solar stays in Float mode? Which settings should I check?

A little bit more info about the system will be nice… Which battery? Does it have a BMS? Do you have a Cerbo-like device in the system? If yes, is the battery connected to Cerbo? Is the DVCC enabled? If not, which are the set voltages for bulk, absorption, float in the Multi RS? Etc… Otherwise…

As well as the list above, what is the actual battery voltage and are the cells balanced. SOC is a calculation and is sometimes wrong, voltage is the key.

Vallid comments of course, I need to provide more details indeed. I was still in the office had had some challenges getting all the details. Voltage of the battery: 53.43 V SOC Battery 67% Currently charging with 117Watt and 2A. LifePO4 MB31 314Ah battteries, 16x JK BMS is connected via the CAN…

Part of the battery charging config: [29CF07EB-6CCE-40D7-AACE-129DFC7F482E_1_105_c]

DVCC info here: 11. DVCC - Distributed Voltage and Current Control If DVCC is disabled, then the chain BMS → Cerbo → MultiRS is not controlling the charging. Therefore the values set into the battery section of the MultiRS are taken into account. The current 53.43V is indeed pretty close with the…

One observation, your storage voltage setting is higher than float, it should be lower. However, I do not expect this to be the issue, but you should set it to the same value as float. A key parameter not shown is the rebulk voltage offset, the battery voltage has to drop this much below float to s…

WIth the sentence: If DVCC is disabled, then the chain BMS → Cerbo → MultiRS is not controlling the charging. Do you mean the MultiRS is controlling the charging of the batteries? I assume so, that is where I configured the battery parameters as per screenshot above.

My current battery config settings: [Screenshot 2025-04-02 at 21.41.11] [Screenshot 2025-04-02 at 21.44.55] [Screenshot 2025-04-02 at 21.44.27] And I just noticed there is a firmware update for the Multi RS Plus, so I changed now to version 1.22. [Screenshot 2025-04-02 at 21.54.19 copy]

[image] Rene: Do you mean the MultiRS is controlling the charging of the batteries? Yes. When DVCC is not enabled, then the inverter/charger - in your case the Multi RS - is controlling the charging. But… It’s better to let the BMS to tell the Multi RS which are the charging parameters. T…

SO on your settings, the charger will only go back into bulk if either if the battery voltage drops below 53.0V (53.6 - 0.6 float - rebulk offset) so you will need to check your history to see if this has happened or not. 7 days have elapsed since the previous absorption (repeated absorption), how…

Multi RS Solar stuck in Float mode while battery is in 60% SOC

DIY

RGroothuis (Rene) 3 April 2025 08:33 13

Seems like the float issue is not occurring anymore, not sure if I can say it is solved as I’m having some DESS challenges right now. See topic

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Multi RS Solar stuck in Float mode while battery is in 60% SOC

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