Salvo wrote:
Something has to cause the voltage surge. I'm fairly certain the surge is from a lot more current going into the battery. Where did this extra current come from? Are there other loads in your setup that disconnect?
You say the inverter shuts down when voltage approaches 14.8V. The video doesn't indicate the exact voltage when it quits. Why not connect a light to the inverter to get a better understanding when it quits. I think the light will go out just when the surge begins.
Sal
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for a brief moment the controller is still pushing solar current into the battery at the same rate even though there is no longer current flowing out of the battery to run the inverter.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.
