Submitted by brandonbeckis on 11. Oktober 2019
Last month I took a 3 week backpacking trip and left the model 3 at home plugged in to 240V with Sentry Mode turned on. I noticed (from my home energy monitor) when i returned that instead of constantly pulling from the wall to power the car that it would pull from the battery for maybe an hour then charge the battery back up repeatedly. This amounted to about 6KWH per day cycled through the battery.
This bothered me a bit since I would have rather all the power used to run Sentry mode and everything else come from the wall without being cycled through the battery. Normally I don't run Sentry mode but I'll burn 1-3% daily on parasitic loses anyway. I got to thinking that in order to prevent parasitic loses from being cycled through the battery, I could plug the car in every night and set it to a lower ampage. This would keep the charger running and providing power from the wall for some charging and all parasitic power needs up until the battery is fully charged. Traditionally I'll charge the car on 240V at full ampage for perhaps 4 hours or so every few days.
The thought then occured to me that if I did this I'd perhaps be adding wear and tear to the charger by having it run all night every night. Pumping coolant, running fans, etc. Really this would be shifting wear and tear from the battery to the charging system.
I've never heard of a charging system wearing out though. Perhaps wear and tear on the charging system is near zero? Perhaps not?
What are your thoughts? Energy efficiency is not a concern of mine. Really I'm looking to do everything I can to maintain the car for the long run. My gas car I've owned since 1998 and I'd love to have this Model 3 20 years from now. Most seem to pay mind to battery care and the thought of charger care only just now crossed my mind.