The controller does not control current. It doesn't care what the current is.
The charge controller (CC) controls voltage. But I don't believe the CC regulates voltage at 14.40V (as you think) just prior to the voltage surge. The CC is in boost mode, which means the charging battery current will cause battery voltage to rise until max boost voltage is achieved (14.8V). With the inverter load, there's more or less an equilibrium at 14.4V, preventing battery voltage to rise. As your first video shows, this equilibrium isn't maintained. All of a sudden all hell breaks loose and we see the battery surge to 14.8V. The CC does what it's supposed to do, that is charge to 14.8V and then drop to a lower voltage (absorption mode).
I've asked you to do a simple test that will tell us whether the inverter turning off is the cause or the effect of the current surge. That would be the number one objective. Only through further testing will we understand how to fix your problem.
Sal
ewarnerusa wrote:
I am in agreement. Maybe my understanding of the current flow is incorrect, I certainly don't claim to be an expert! I just know enough to maybe get me in trouble... But in my mind what is happening is I have solar current going into the batteries and during the inverter load condition I have current going out of the batteries to the inverter to run that load. The system is in sort of an equilibrium with the controller deciding how much solar current to allow into the battery to allow for the inverter to "pull" the current it needs from the batteries and to maintain the battery voltage right at 14.40V by "pushing" in the right amount of solar current. When the inverter load gets removed, for a brief moment the controller is still pushing solar current into the battery at the same rate even though there is no longer current flowing out of the battery to run the inverter. So we get a brief period of voltage rise on the battery from the solar current pushing in without a corresponding draw from the inverter. The controller does do what it is supposed to and cuts the current so that the voltage falls back to 14.40V, but in the meantime the inverter has tripped on high voltage disconnect due to sudden rise that occurred. There is nothing peculiar about this type of rise, it is just normal battery charging behavior. But the problem is I have this finicky inverter that faults out at around 14.8V.
