Greetings Community,
I have a quattro parallel installation 2x8kVA running in ESS with a slight imbalance.
The system is newly commissioned and as far as possible Victron guidelines have been followed with respect to battery sizing, cabling sizing, layout etc. In general the system appears to be running well with the ESS assistant. I have two items of concern that may be interlinked:
1. Shortly after commissioning the local grid transformer failed and the system has been running continuously for weeks with no grid. Effectively off-grid. Is running with ESS in this way an issue?
2. There is an imbalance on the inverters. At varying loads (but not full load) I have measured a difference of about 8% between the two units' DC current, and roughly 8% between units AC currents. The lower loaded unit (the master) seemingly more noisy (hum/buzz) than the higher loaded unit. Is this difference sufficient to cause concern?
Other potentially useful information. The system has 800Ah of Pylontech UP5000 capacity, it has a Cerbo unit, 2x 150/75 SmartSolar MPPTs and (for indication only) a BMV measuring at the battery. Although the system is sized at 16kVA it will most likely never be fully loaded, the owner requested suffiecient headroom to ensure the system was not stressed.
I have searched the forums but have not found any definitive answers that state what level of imbalance is of concern and at what point noise should be concerning. Any help or guidance would be greatly appreciated.
Thank you.