I recently installed a Rutland 913 wind gen with HRDX regulator. At the same time, I installed a Victron battery monitor. I have noticed that, with all other sytems switched off and the batteries well drained, the readout from the Victron turns negative-AMP draw-when the wind gets much above 15 knots. It is positive in low winds. The HRDX readout remains progressively higher as the wind rises, in the normal way, as your would expect. Can anyone cast light on this anomaly please?