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Tesla sets charge limit to 90%
- Thread starter Iron
- Start date
How is your process of charging to 100% able to tell you the battery capacity? I generally use simple mathematics at any percentage SoC to calculate the capacity at 100%. Please correct me if I'm wrong, but I'm under the impression that to get a true 100% capacity reading of the battery, and to recalibrate the BMS, you must drain the battery to 0% and then charge it up to 100%.
Well of course it doesn’t....and I also use maths to calculate 100% from a lower percentage...but the battery meter doesn’t go to decimal point so every percentage point is worth more than 5 kilometers...so some error can occur.
I have never yet recalibrated...by knowing my 100% range, I feel that I am in a better position to judge if I need to or not. Besides it’s a rare event to charge fully and I follow best practice and leave immediately.
Calibration.
Tesla battery management system (BMS) calibration
Tesla battery management system (BMS) calibration instructions
tesla-info.com
Quoting myself just to say.... my, my.... how things have changed in three months! I was beaten down with logical information.
There are currently three different versions of the Tesla Model Y sold in the US. Each comes with an estimated EPA combined city/highway range. Which version of the Model Y did you purchase? The EPA range number is just an estimate, your actual range will probably be less, perhaps 15% less than the EPA value.
Inside the Tesla vehicle the battery indicator will either display the current state of charge of the battery as a % or if you tap the displayed value it will change to a current range estimate.
No. a kilowatt is a measure of power, i.e. 100 Watts of power X 10 would be 1000 Watts or 1 kilowatt. 1 kilowatt being consumed for 1 hour would be 1 kilowatt hour (1 kWh). If you know your EV's consumption in Watt hours per mile you can estimate how many miles you could travel using 1 kWh of energy. For example 250 Wh per mile is 0.250 kWh per mile. 1/0.250 kWh = 4 miles of driving per kWh.
The 2023 Tesla Long Range Model Y has a battery capacity (when new) of right around 79 or 80 kWh. If you were able to achieve 4 miles of driving per kWh your range would be approximately 4 miles/kWh X 80 kWh = 320 miles.
Watt hours per mile (Wh/mi) is a measure of energy consumption and EV driving efficiency. A higher value means lower efficiency (would use more energy for every mile driven.) A lower value indicates higher efficiency. 250 Wh/mi as noted would be 4 miles per kWh. Some Tesla owners can achieve this level of efficiency but if you took a sample of Tesla Model Y owners you would find that lifetime driving efficiency falls somewhere between 240 Wh/mi and perhaps 300 Wh/mi. Right around 270 Wh/mi is a common efficiency value.
More than any other variable your highway speed has the biggest impact on the Wh/mi consumption and the ultimate range you could achieve before needing to stop and charge the battery. Above 60 MPH every 5 MPH increase in speed will reduce your efficiency (increase the Wh/mi consumption) by almost 10%. 70 MPH is 10% more efficient than 75 MPH and much more efficient, i.e. 20% more efficient, than driving at 80 MPH.
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E90alex
Active Member
What do you mean calculate the range? The range in miles or battery % will be displayed at the top of the screen next to the battery icon. Tap to change from one to the other. This is ideal EPA rated range, which you will likely not achieve in the real world. Best to keep it on % display instead of miles because if you base your trip planning and charging stops on the miles displayed at the top you will run out of battery.
The car gives a more realistic range estimate in the energy app under the consumption tab and that number is based on recent driving over the last 5/15/30 miles.
If you mean trying to calculate what 100% rated range would be when you are not at 100% charge, its just simple math. Take the displayed miles and divide by the displayed % as a decimal. Like if it shows 256 miles at 80%, do 256 divided by 0.8 = should be 320 at 100%
metroplex
Gearhead
Someone here suggested charging once a week, but the amount of depletion DOES have an impact on battery degradation - same with maintaining the battery at too high of a SOC.
I finally got the M3LR out of winter storage and when I stored it six months ago, it was at 90%. Now it is at 63%, and I didn't bother charging it. I drove it and got home with 55% remaining. I didn't feel any loss of power.
I am thinking about keeping the daily charge limit at 55% - does anyone see any negatives with this aside for long trips (I'll plan ahead and set it to a higher charge if I need it)? Seems I'd be above 45% on a daily basis.
I finally got the M3LR out of winter storage and when I stored it six months ago, it was at 90%. Now it is at 63%, and I didn't bother charging it. I drove it and got home with 55% remaining. I didn't feel any loss of power.
I am thinking about keeping the daily charge limit at 55% - does anyone see any negatives with this aside for long trips (I'll plan ahead and set it to a higher charge if I need it)? Seems I'd be above 45% on a daily basis.
No negatives here.
For what it's worth, my typical daily charge limit is 50% and has been for months. I return home from work with around 34%.
I usually charge to 80% before starting a road trip.
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Came across this list of best practices today. Number 7 says "fully charge every 3 months" for battery balancing, yet #1 says only do it when you plan to drive within a few hours. I do recall seeing this said before but also that you'd need to let the car sit 3 or 4 hours at that SOC for the rebalancing to occur. My current train of thought is to never push it to 100% unless absolutely necessary. Anyone doing this? I've never charged to 100 before and it's been a little over 3 months having the car.
collisionprosinc.com
Your Tesla battery is designed to be relatively low maintenance, but there are some best practices to get the most out of your Tesla battery. I’ll share some valuable Tesla battery maintenance tips to improve your battery performance and longevity.
7 Tesla Battery Best Practices
7 Tesla Battery Maintenance Tips ~ Collision Pros
The Tesla battery is designed to be very low mainenance, but there are a few battery maintenance tips that can help you.
collisionprosinc.com
7 Tesla Battery Maintenance Tips
7 Tesla Battery Best Practices
- Partial Charge Battery- Battery Charging should be maintained between 20%-90% when possible. It’s best to only charge your battery to 100% when you plan to drive your Tesla within a few hours. In some models you can set the charging time to allow you to be 100% charged within a few hours.
- Low Voltage Charging- Tesla recommends that you maintain a regular every day charging schedule using a low voltage charger. The high voltage super chargers are not meant to use daily.
- Regenerative Braking- Set your regenerative braking to “Standard”. This will increase the energy you get while braking.
- Avoid Low Battery Charge- You should avoid leaving your car for long periods of time below 20-30% battery charge. Your vehicle will use about 1% battery just sitting there operating the computers. Avoid letting it get so low that these small drains don’t kill your battery.
- Don’t Let Battery Get Too Cold- When you can, you should keep your Tesla stored in warm area above 20F. Cold weather can reduce the energy your battery stores. It’s best to leave it plugged in to allow some warmth from the charge.
- Don’t Let Battery Get Too Hot- Try to keep your Tesla in temperatures below 85F. In really hot temperatures the battery may take a little more energy trying to cool the battery. This is referred to as “Vampire Drain”. You can lose as much as 2-3% of your battery charge per day. To avoid this, leave your vehicle plugged in or try to park out of the direct sun.
- Fully Charge Every 3 Months– It’s a good practice to fully charge your battery every 3 months. This practice is called battery balancing. It will help maintain the maximum capacity to your battery.
This information seems to be dated, incomplete. I would follow Tesla's recommendations regarding the battery per the Tesla Model Y Owner's Manual.Came across this list of best practices today. Number 7 says "fully charge every 3 months" for battery balancing, yet #1 says only do it when you plan to drive within a few hours. I do recall seeing this said before but also that you'd need to let the car sit 3 or 4 hours at that SOC for the rebalancing to occur. My current train of thought is to never push it to 100% unless absolutely necessary. Anyone doing this? I've never charged to 100 before and it's been a little over 3 months having the car.
7 Tesla Battery Maintenance Tips ~ Collision Pros
The Tesla battery is designed to be very low mainenance, but there are a few battery maintenance tips that can help you.7 Tesla Battery Maintenance Tips
Your Tesla battery is designed to be relatively low maintenance, but there are some best practices to get the most out of your Tesla battery. I’ll share some valuable Tesla battery maintenance tips to improve your battery performance and longevity.
7 Tesla Battery Best Practices
- Partial Charge Battery- Battery Charging should be maintained between 20%-90% when possible. It’s best to only charge your battery to 100% when you plan to drive your Tesla within a few hours. In some models you can set the charging time to allow you to be 100% charged within a few hours.
- Low Voltage Charging- Tesla recommends that you maintain a regular every day charging schedule using a low voltage charger. The high voltage super chargers are not meant to use daily.
- Regenerative Braking- Set your regenerative braking to “Standard”. This will increase the energy you get while braking.
- Avoid Low Battery Charge- You should avoid leaving your car for long periods of time below 20-30% battery charge. Your vehicle will use about 1% battery just sitting there operating the computers. Avoid letting it get so low that these small drains don’t kill your battery.
- Don’t Let Battery Get Too Cold- When you can, you should keep your Tesla stored in warm area above 20F. Cold weather can reduce the energy your battery stores. It’s best to leave it plugged in to allow some warmth from the charge.
- Don’t Let Battery Get Too Hot- Try to keep your Tesla in temperatures below 85F. In really hot temperatures the battery may take a little more energy trying to cool the battery. This is referred to as “Vampire Drain”. You can lose as much as 2-3% of your battery charge per day. To avoid this, leave your vehicle plugged in or try to park out of the direct sun.
- Fully Charge Every 3 Months– It’s a good practice to fully charge your battery every 3 months. This practice is called battery balancing. It will help maintain the maximum capacity to your battery.
Model Y Owner's Manual | Tesla
metroplex
Gearhead
Been driving it for a week with setting it to 50% and usually get home at 43% sometimes down to 41% if I drove at higher speeds, more freeway, or more stoplight launches. Seems to not have a noticeable loss of power on the street. Certainly better than Chill mode which feels way too low on power to be safe for our traffic speeds.
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