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Wondering if I should just unplug it everytime .. how much energy am I wasting by keeping the plug attached?
Thanks
Wondering if I should just unplug it everytime .. how much energy am I wasting by keeping the plug attached?
Thanks
Wow. Owning a Tesla shouldn't be nearly this stressful. Not sure where your concern about "safe battery level" is coming from. Are you thinking of the recommendation to set charge at 50% for long term storage? If so, that's meant for storing the car for weeks to months, not overnight! Don't worry what your SOC is when you get home, if you're not needing to going back out that day and the car will charge overnight.I've only had my car for a week, so please don't take this as wise or sage advice, just items for thought.
Given that others have said there's not trouble from leaving it plugged in, I have a good reason to plug it in: I charge in multiple stages when I get home, and I don't want to go out every time just to turn it on or off. Many of those are scheduled charges. Too bad that I actually have to manually set max amps and change schedule inside the car, because I'd like to set multiple schedule and amps points throughout the day remotely.
For example, here's a rough draft of how I plan to do it:
Background:
My solar system puts out a small amount of power (5.8kWp = 5,800 watts peak power -- I have to find out if this is AC or DC), during the middle of the day. I usually run out and set the Amps on my car to whatever kW my solar is currently outputting minus enough for the house to take the rest, so that I do not use high rate electricity during the day, and I use the solar power as much as possible. Watts=Volts*Amps. kW=KiloWatt=1000Watts. kWh=the amount of energy equal to 1kW for an hour (which you can obtain quicker or slower than one hour, so it is an amount measurement, not a time measurement -- horribly confusing!, but if you are charging at 1kW average, then in an hour, you get 1kWh, and if you are charging at 2kW average, then in 30 minutes, you get 1kWh, or in 60 minutes, you get 2kWh, and so on (e.g., the Alameda Whole Foods I get 40kW at the EVGO Chademo, which allows exactly 30 minutes at $0.10/minute in the $15/month plan, so (30 minutes / 1 hour) * 40kW = 20kWh, and 20kWh at $0.10/minute for 30 minutes is $3 for 20kWh or $0.15/kWh (plus my monthly rate), which is a good way to compare costs to my local charges; most EVGO Chademo are 30kW, so they are $0.20/kWh cost at almost all EVGO in California).
Starting Jan. 10, 2017, our rate at 11PM goes down to around $0.15/kWh, whereas in the day it will be around $0.50/kWh. Charging 11PM-7AM will cost less.
Weekdays workdays at my 6AM-2PM job:
Weekends:
- When I get home, I immediately get it up to a safe battery charge, so that it is not damaged at a low state of charge. I do this as soon as possible when I get home, even though the electricity rates are high. If my solar panels are making enough energy, I'll try to use that instead of the local PG&E grid power. I have yet to determine the best % for this, but I'm guessing it is somewhere between 20% and 60% in my "60" that is actually a software limited 75. Your car will be different unless it is the same as mine. I lower the amps used by my car to be about 1kW lower than the output of the solar panels if they are producing a lot.
- After charging in step 1, I re-adjust the amps in the car to the max (48 Amps for me) for the overnight charges. Because I might forget this step, I calculate enough minimum % targets so that even if I sleep through this step, I am ok the next day.
This is where there would be a step 3 (followed by step 4 below) if the car scheduler allowed it. As soon as the grid electricity gets to the good rate, whether this be sunlight or time of use (for me 11PM), I can start the next bunch of charging, to get it closer to the overnight safe zone, but since I am usually in bed, I can't do this. Instead, I just skip this step, making certain that the minimal safe zone was already achieved in step 1.- I set the time schedule in the car to start charging so that I get to 100% at the latest possible moment that I can leave the house and still make it to work on time, without going past the bottom-cost electricity at all (7AM for me, but I have to leave for work no later than 5AM, so I calculate 100% target to be 5AM). If I leave early, I can drive slower, and will have more time to get to intermediary charging stations, so it does not matter that I don't reach 100% if I am so lucky as to be ready to leave before I have to leave. If I leave late, the 100% will be eaten up more quickly by my more active driving, and I'll be stuck in more traffic, so more climate control means more energy use. I set this time every Sunday, calculated for the next weeks' worth of work, and every day that the next day is expected to be different.
All the above are done from my room, hundreds of feet away from the car itself, except for changing the amps level. I don't have to unplug or plug in the car. I'm thinking of getting a charger with a pilot in it to make that work better remotely, too.
- When I get home, I get it up to safe battery charge. I also try to make use of the solar panels, without going over. I set the target % and amps max both to work within these constraints.
- If the solar gets better, I readjust.
- In the evening, I set the amps back up to max. Sometime before the weekend (on Friday, or on the weekend itself), I set the time for charging to once again be during the good cost times (11PM-7AM). I target a safe battery level of around 60%, which in the 60D is the same as around 50%, which is a good spot to leave it long term.
- When I wake up the next morning, I determine when, and if, I will go anywhere. If I think I will, then I put the car to whatever % state of charge I want to charge it at, and tell it to start charging.
are you referring to the 14-50 plug or the umc(what plugs into the car)?Leave it in. If you don't the receptacle is only good for about a year before it needs replacing (typically 300 cycles for a normal 14-50).
Neither. The 14-30 OUTLET is what can wear out with repeated plugging and unplugging, just as household outlets wear out when the vacuum cleaner has been plugged in too many times. This is why EV park outlets are in such bad condition.are you referring to the 14-50 plug or the umc(what plugs into the car)?
The receptacle in the wall.are you referring to the 14-50 plug or the umc(what plugs into the car)?
Some people really like having fiddly, detailed, unnecessary routines. It's part of trying to do the best thing possible with items that are important to them. You and me? We'll just keep on plugging the car in when we get home and not thinking about it. Different strokes for different folks.Wow. Owning a Tesla shouldn't be nearly this stressful. Not sure where your concern about "safe battery level" is coming from. Are you thinking of the recommendation to set charge at 50% for long term storage? If so, that's meant for storing the car for weeks to months, not overnight! Don't worry what your SOC is when you get home, if you're not needing to going back out that day and the car will charge overnight.
If you're running low on charge on your usual commute, then you chose too small of a battery. Unlocking it to a 75 would simplify your life and reduce your stress level immensely.