Hello every one.
I’m hoping sone one here can help me with this problem.
I have run a single 48 volt multi plus since 2014. I also have 10 kw of solar panels and 60 kWh battery storage.
every thing has worked very well so far.
I have this week installed a second multi in parallel but I am now having issues with them maintaining the grid set point.
so. To explain what is happening at night when there is no solar power I’m having to set the grid set point to about 220 watts in just to keep them from beginning to export from the batteries to the grid. If I leave the set point where it used to be which was 10 watts draw from the grid they start to export up to around 2 or 300 watts If the house load increases the inaccuracy also goes up and the amount of power exported to the grid from the batteries goes up.
when day break comes and solar energy starts things swap over. Now the units start to import from the grid and the higher the solar energy gets the more the multi’s pull from the grid.
Once I get up to around 7 kw of solar power in having to set the grid set point to around 700 watts export to maintain a reasonable setting close to the desired 0 grid set point.
As evening comes and solar power starts to drop I have to begin to gradually reduce the grid set point again
Does any one have any idea as to what I have done wrong please.
