I am off-grid and I have a pair of the SI-6048-US wired in split phase config - working well. (7.5K PV with 2 Midnite 250's and 24kwh Li-Ion battery, REC BMS) I want to attach a 11kw Generac for when the sun doesn't shine. My problem is I am getting a 10V reading on the AC2 Gen/Grid Neutral...