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feded00 asked

Power management with Multi + Battery + MPPT tracker + cerboGX


I have a question concerning the scheme below, where I am planning to build an off-grid test bench for a battery (48V) connected to a Multi-II used as an inverter to power some AC loads and to an MPPT solar tracker managing the power coming from a PV array. We also consider to include a Cerbo-GX for monitoring purposes (e.g. reading data for our BMS, which runs on a PLC).


Specifically, is it possible to decide how much watts to put into the battery vs to power the AC load?

As an example: consider a PV generation of 1500W. Can I charge the battery with 700W and power the load with 800W? Is this doable via the Cerbo-GX controlling the Multi-II?


Many thanks in advance.


scheme-2.png


Multiplus-IIMPPT SmartSolarbatteryoffgrid
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Alexandra avatar image
Alexandra answered ·

@feded00__


You are offgrid.

The system will prioritise loads of the inverter over battery charging. In other words the solar powers loads, then left over production goes to charging. If your production is power than your loads it will pull the needed power from the battery (discharge) and solar.

You can as a consumer control your loads.

If you were on grid you could then choose where the solar was going and the grid would supplement the load if the solar amount you chose was lower than load. But then that is exactly what the Victron ESS assistant already does.

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feded00 avatar image feded00 commented ·
Thank you for the answer.


Do I need to enable DVCC to achieve this? If I understood it correctly, the parameter "Max charge current" of DVCC mode should take care of this.

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