My Observations on the Sunny Island 6 SI6,OH-11, New, purchased 2014, European Market 50HZ.
Problem, 50HZ leaps to 60HZ, SI6,OH-11, (2014) Battery Current Sensor Shunt.
At present I have enough PV DC coupled sources to charge my 1300ah 48v bank of batteries, but it might be nice to use the SI sometimes especially as I add more AC Coupling in the future as it can also take AC and back charge the 48vdc batteries.
With my particular SI6,OH-11, (2014) when entering the type and values of the Shunt into the SI software I noticed it is factory set at 100amp 50mv or 60mv, now obviously I set this to 250amp at 60mv to match my physical shunt itself.
However, what I find is during the shut down and restart procedures when installing the shunt, the shunt setting can revert back to a factory setting.
So you think everything is going to be okay, then a little bit of DC coupling, in this instance only 40amps, and this software bit with the Shunt throws the SI Inverter from 50Hz straight to 60Hz mode, it does not climb steadily, no, it just jumps up.
SO......If you are going to have a lot of DC Coupling, and for me it could be as much as 150amps, .........Then.......DURING THE BATTERY CURRENT SENSOR SET UP, PLEASE ENSURE THE SETTING FOR YOUR ACTUAL SHUNT MATCHES THE SETTINGS IN THE SOFTWARE, AND THAT THE SOFTWARE SETTING HAS NOT REVERTED TO A FACTORY SETTING, as mine kept doing.
My lasts set up I ended up doing it twice, and I keep checking, and its holding, so far....... fingers crossed!.
I can now understand why SMA are not particular interested as DC Coupling, as it is not their ball game, and the SI was meant to blend/join in with their AC products.
But Importantly perhaps a little more information in their manual about DC Coupling, source connections etc, might have been helpful for some of us. Instead we have got the European & Australian Forums guiding us along.
So that's the TRIGGER FAULT, WATCH THAT FACTORY DEFAULT SETTING.