I recently moved to a house that has a heat pump. My plan is to install a NEMA 14-50 outlet in the garage for charging. (I plan to get a Model S this spring). I just noticed that when the heat pump starts, the lights in the house dim a bit (for perhaps a quarter of a second), indicating a voltage sag. This is probably not abnormal due to high inrush current on the heat pump compressor. I suppose this will probably also happen in the summer when the compressor comes on for A/C.
The heat pump is on its own circuit at the main panel, suggesting that the voltage sag is on the power company side. This is not surprising - I am out in the country, so our house is served by its own power company transformer. The voltage sag could be in the transformer and/or the (underground) wiring between the transformer and the house.
Here is my question: on this forum I have seen some discussions about the MS charging system automatically backing off charging current when it detects a voltage drop. Is it likely that the voltage sags caused by the compressor start up will cause the Model S to drop its charging current, leading to very long charging times? (If so, I suppose I could tell the power company I want this fixed, but I think they would want me to pay for it - $$$$). What do you think?
The heat pump is on its own circuit at the main panel, suggesting that the voltage sag is on the power company side. This is not surprising - I am out in the country, so our house is served by its own power company transformer. The voltage sag could be in the transformer and/or the (underground) wiring between the transformer and the house.
Here is my question: on this forum I have seen some discussions about the MS charging system automatically backing off charging current when it detects a voltage drop. Is it likely that the voltage sags caused by the compressor start up will cause the Model S to drop its charging current, leading to very long charging times? (If so, I suppose I could tell the power company I want this fixed, but I think they would want me to pay for it - $$$$). What do you think?