Originally Posted by CaptainRivet
But they did interfere, i could reproduce it.
It were the integrated solar charger
from the silentwind wind
gen controller and one victron MPPT
Swaping to 2 victron MPPT
50/100 connected via VE-bus and synchronization solved
If the controllers are programmed to regulate at 14.6v, it should not be possible, if they are functioning correctly, for the battery
voltage to reach 20v as you have reported.
I suspect the Silentwind controller was faulty or has been wired incorrectly, but I have never used this model so perhaps this has a weird software
controllers use dump resistors (generally for the wind regulation only) so their behaviour is fundamentally different to solar
controllers. Unlike solar controllers, every manufacturer’s implementation is unique so their behaviour is not always predictable, but if working correctly they should still always cut power at their programmed voltage.
Removing the Silentwind controller and replacing it with a Victron controller has obviously fixed the problem. Linking the Victron controllers is a good policy, and is easy to do with the modern units, but the battery
voltage will not rise to very high levels if the controllers are not synchronised. There can be some minor conflicts with multiple controllers where the absorption time is not ideal (usually too long), but these problems do not result in the very high voltages you experienced.
Anyway, the problems you have experienced are not a normal consequence that people using multiple controllers need to be concerned about.