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micmak avatar image
micmak asked

Prioritize Grid Feed-in over battery charging

Hello,

I have a Quattro and a Fronius in a AC coupled configuration, as well as 2 Bluesolar MPPT. I would like to prioritize Grid Feed-in over battery charging, when Grid is available. I currently do that manually by setting the DVCC battery voltage limit to the current voltage when the grid becomes available. Is there a way more automated to do that within the cerbo gx? I would prefer that before I go the modbus route for this.

The reasoning behind this is that the grid is available for a couple of hours during the day, and sometimes a couple of hours in the evening. I would prefer to be feeding back when it is available, then continue charging the battery when it is offline.

MultiPlus Quattro Inverter Chargercerbo gxFronius
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Alexandra avatar image Alexandra ♦ commented ·
@micmak

What have you set as your min SOC in case of grid faliure? If you set that down it should feed when it is above that level?

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matt1309 answered ·

If you have ESS setup I would probably try to use Node red with the below Pseudo code to adjust grid setpoint to achieve this. Similar solution to what i imagine you would've done the modbus but instead using node red.
I would personally also add a few other critiera based on your system requirements ie a minimum SoC for the flow to run. ie if below 20% dont export.

Node red should then dynamically adjust grid setpoint each time flow runs. It wont be super responsive if loads fluctuate a lot but it's a work around.


if grid available {

//if sufficient solar

if (Loads - solar > 0) {

set grid setpoint = -(loads - solar)

}

}

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