Do any of the sources ever run in parallel? It's common enough for battery systems to be grid-connected for instance and if that was the case then a grid failure might pull down the voltage detection on both the grid and inverter lines.

Or it could be dodgy software of course.

I'm guessing in the wind of course - a lot more detail would be needed for a sensible analysis...

        - Andy.

Do any of the sources ever run in parallel? It's common enough for battery systems to be grid-connected for instance and if that was the case then a grid failure might pull down the voltage detection on both the grid and inverter lines.

Or it could be dodgy software of course.

I'm guessing in the wind of course - a lot more detail would be needed for a sensible analysis...

        - Andy.

Hi Andy,

Thanks for your reply, Below is part of the documentations

First priority is to the solar power followed by grid in daytime and battery in evening time. - Battery capacity is broken into two parts - Normal (say 50%) and Reserve. The Normal battery is emptied ahead of the Grid in the evening, whereas the Reserve battery is retained as a back-up and used towards the end (early morning before new solar day starts).

- DG is usually not used but will come on once the battery is near its end. As a DG operates best on good loads - more complex algorithms are possible, where if there is a high load and no grid, DG can be run rather than draining the battery.

At night, during a grid outage, if the load has not reached 25% of the generator load, the BESS will charge from the generator to maintain the minimum generator loading but only up to 40% SOC of the BESS, after that the BESS will switch off the generator and will discharge by powering the load until 12% SOC;

I am inclined to believe that the problem maybe more towards the controls in the PLC as there is a lot of ifs based on the state of charge (SoC)