kWh left in battery?

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Tee2

Member
Joined
Aug 4, 2014
Messages
21
Does the enTune app show how many actual kWh are left in the battery? I can sorta gauge it by looking at the battery graphic but an actual number would be helpful.

Thanks
 
The yet to be launched cell phone app called "myEV by myCARMA" will display starting and ending SoC percentages after each drive in your RAV4 EV. Just multiply the ending value by 41.8kWh to find out, but remember this determines your "useable" capacity that remains in your battery, not the total capacity.

Go here for more info: http://www.mycarma.com/products/myev/
 
Dsinned said:
The yet to be launched cell phone app called "myEV by myCARMA" will display starting and ending SoC percentages after each drive in your RAV4 EV. Just multiply the ending value by 41.8kWh to find out, but remember this determines your "useable" capacity that remains in your battery, not the total capacity.

Go here for more info: http://www.mycarma.com/products/myev/

Not quite. 100% SOC only equals 41.8kWh usable with a room temperature or greater battery that is not degraded.

SOC% will not show battery degradation or cell temperature. In other words, a 50% degraded battery would only hold 20.9kWh, but show 100% SOC when fully charged.
 
Tony, from what I've read on the myEV by myCarma site, the app will also report battery degradation. This is one of the main features of the app. In fact, the people behind the app are tauting to their Indiegogo contributors the app's ability to do this fairly accurately. They claim they have an EV battery "expert" on staff who developed a special algorithim for this purpose. So, if they really have something good, it may be that the logged values reported for beginning and ending SoC are already adjusted for battery degradation. In which case, the maximum value for SoC at 100% usable charge would be 41.8kWh, but that value slowly declines over time. Of course, most of us getting the app (promised in October) have RAV4 EVs (and/or other EVs) that already have thousands of miles on their batteries, so how does this algorithim factor in any pre-existing "aging" of a battery? Also, is there stored data in the car that the logger can read via OBD-II port that tells the app how many hours and charging cycles have already occurred on a battery? I presume the OAT and/or battery temperature can be pulled by the app as well.
 
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