A follow up on "emergent behaviour", as Damon described...
We have two Midnite Solar (MS) Classic controllers, each capable of comfortably taking about 2.5 kW from our turbine. I've been trying to figure out what the h%*! has been going on. Something changed recently that seemed to be causing the first controller to want to
unload - revert to 'Resting' - just as it should be current limiting, and passing excess load to the second one.
I'd forgotten this, but when we first set this up we had to work through a similar error that was being triggered by something called "OCP". OCP, or over-current protection is something that is set up to help protect the FETs. Long story, but OCP it seems does not work well with wind mode in this configuration. We ended up spinning our alternator up, in dynamo-fashion (using our car).
I was then able to film, and share this with MS Tech's years ago. It took a lot of finesse, but thanks to Ryan (who dabbled with wind, & sometimes posts here as 'Half-crazy') we worked through a means of turning this feature off. It involves changing two settings in the (Modbus?) programming. I'm inserting them below in hopes in may assist anyone else that should encounter this event. It may never surface with one controller; I don't know:
What I'd forgotten, is that when you do a reboot, or firmware update, one of those settings reverts to the default setting, so you have go back in and check them. A few weeks ago, I had to repower one of the controllers because one menu/screens appeared to have frozen (this may have been related to the DST time change). I'd totally forgotten to re-check this setting.
Once again I videoed the event last week, so as to slow it down to frame-by-frame pace. I woke up to this "Ah-huh, well-duh!" moment over the weekend, and we are happily back in the saddle now.
When working properly, it is quite slick. There are 16-programmable steps in each power curve. The current limit is set to match the last step of the Classic A. The second step of Classic B (the first is set lower, but -0- amps, to wake up the unit) starts at the ending voltage for A, so anything in excess of the current limit shifts to Classic B.
My memory it would seem is not improving with age. I'm adding a(nother) laminated reminder card to the wall by the controllers for future reference.