Strange charging

[spacklewoof]

I dunno if it is the heat, my mcu swap or if they just broke it, but my charging is swinging between 12 and 24mph when hooked to my home charger. It used to charge consistently at 24 mph. I don't remember what I was at before, but now I'm at 2019.20.4.3. same wall charger. New mcu with LTE upgrade woohoo! It's much hotter at night now than it was two weeks ago when it broke. I have a 2012 model s 85 with dual chargers. Any one else?

 

[davewill]

There's two reasons this happens, outside of a fault in the car. One is not getting the connector fully seated in the charge port, in which case you'll get a message about the charge rate being limited. Usually, pushing the connector in more firmly will fix that. The second reason is the car detecting voltage fluctuations during ramp up or while charging that causes it to lower the charge rate. I'd check electrical connections visually and look for hot spots while charging to diagnose that.

 

[brkaus]

Please watch the volts and amps and see if they change? That tells exactly what is going into the car.

The mph charge rate can vary depending on heating or cooling required.

 

[spacklewoof]

There's two reasons this happens, outside of a fault in the car. One is not getting the connector fully seated in the charge port, in which case you'll get a message about the charge rate being limited. Usually, pushing the connector in more firmly will fix that. The second reason is the car detecting voltage fluctuations during ramp up or while charging that causes it to lower the charge rate. I'd check electrical connections visually and look for hot spots while charging to diagnose that.

The voltage was fluctuating from 242 to 245. it usually steady at around 242. Thank you.

 

[brkaus]

Was the current (amps) also fluctuating?