Last night, 10/18, the utility provider wisely initiated a planned safety shut-off due to high winds (they were almost up to 4 MPH at one point). We really did not even notice the power was off due to the highly efficient transfer with the 18K inverter. We thought that out two 14.4 KW batteries reading 96% charge would hold-out for our average power consumption of about 1200-1400 watts for at least 36 hours or so with the well pump and other occasional power draws coming and going. The power was cut around 20:00 exactly and at 00:18, almost exactly four hours later, the batteries read 0%. The inverter showed 6.5KW over the entire 24 hr period of 10/18.
How is this possible? Are our batteries shot or defective?
