![]() ![]() Which is good news as it's our car! Comparing it to what might be expected The example is from a Model 3 Long Range with a BT37 battery and shows negligible degradation. To convert to the battery capacity,divide by the percentage as a decimal:Ĥ1.45 / 0.57 = 72.7 kwh using the example screen shot. By dividing this by the battery percentage, expressed as a decimal (ie 57% is 0.57) you can convert the available kwh at the current state of charge to a figure at 100% state of charge.Ģ94 X 141 = 41,454wh or 41.454kwh available at the current state of charge. Multiplying these 2 together gives a figure, which when divided by 1000, equates to the number of driver available kwh in the battery at the current state of charge. The BMS has calculated the range it can achieve based on the recent driving history which is reflected in the Average consumption figure. The AVG consumption, the Projected range and the Percent This is also best done when the car has just finished a journey and not when the battery is cold and or vampire drain may have occured as this can decrease the battery capacity artificially. If you are not showing % at the top of the screen, this can be changed via the Display options through the menus. To calculate the available battery capacity you need three pieces of information which are easily accessible from the energy screen. ![]() We have created a Battery capacity calculator tool that can get information via the API that will calculate the battery capacity for you. Please note: the latest Model S and Model X since the 2021 facelift do not include the information available to perform the calculation within the car. Check out our Guide to Tesla BMS calibration to the nature of the issue and how it can be resolved if you suspect it is needed. This drift is fairly negligible on a Model s and Model X but can be more significant on a Model 3 and Model Y. It is also worth noting that day to day, the battery management system can drift depending on how the car is used with respect to charging. The following is best done at the end of a drive when the battery is warm and factors such as vampire drain and cooling of the battery have not had chance to influence the results. This is a guide to talk you through how to take the numbers the Tesla is reporting, turn these into a max usable kwh capacity information for the car and then compare these to the figures you should expect to see for a new battery. A common concern for Tesla owners is how to calculate the battery degradation or establish the health of the battery as it's not that easy. ![]()
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