I have an ESS installation with two 48/3000 MultiPlus-II inverters in parallel with grid feed-in disabled. The ESS Grid setpoint is set at 50W, but I experience incrementally higher (up to more that 400W) grid consumption as the Multi’s power output increases. I assume this is due to slight imbalances in the internal current sensors and/or cabling? Can this be resolved with an external current sensor (MultiPlus-II Current Transformer), and will a single sensor connected to the primary Multi and measuring upstream be sufficient? Note: The utility grid meter is sensitive for grid feed-in and disconnect when sensed