## How many KWh does each point on the SOC meter represent ?

evnow
Moderator
Posts: 11480
Joined: Thu Apr 22, 2010 11:41 am
Delivery Date: 25 Feb 2011
Leaf Number: 303
Location: Seattle, WA

### How many KWh does each point on the SOC meter represent ?

Gary and others who have the SOC meter. Try this to figure out
- whether miles/kwh & the SOC meter are consistant with each other
- if the above is ture, get the actual KWh each point of the SOC represents

Before each trip
- reset the trip odometer and the m/kwh (best done with the dash rather than center console m/kwh)
- note the SOC (call this SOC1)

After the trip
- note the odometer and the m/kwh reading (call this O and MPK)
- note the SOC (call this SOC2)

KWh / soc point = (O/MPK)/(SOC2-SOC1)

If couple of you do this for a week, we can establish whether miles/kwh & the SOC meter are consistant with each other and if so, get to actually define the what the SOC unit represents. (i.e. calibrate the SOC meter).

If we can do this, instead of or in addition to SOC %, we can display actual KWh of ("usable") charge left in the battery.
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

garygid
Gold Member
Posts: 12469
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

### Re: How many KWh does each point on the SOC meter represent

A good suggestion, but the relatively coarse resolution in the Mi/kWh reading (2.5% to 3%) make the results a lot less definitave.

It would be good to gather data points (trip meter, Average mi/kWh, and SOC) at multiple points during the trip, in addition to the Start and End of a trip.

If we can find the miles and mi/kWh in the CAN data, we can automatically log and plot this data for each instrumented trip.

At this point, it is not known if the SOC is very dependable on the low end of the scale.

But, gathering data will be good, and easier when we get more of the SOC-Meters into LEAF-owner's hands.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
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evnow
Moderator
Posts: 11480
Joined: Thu Apr 22, 2010 11:41 am
Delivery Date: 25 Feb 2011
Leaf Number: 303
Location: Seattle, WA

### Re: How many KWh does each point on the SOC meter represent

garygid wrote:If we can find the miles and mi/kWh in the CAN data, we can automatically log and plot this data for each instrumented trip.
True. But this would be a good start - Once I've my SOC meter built, I'll log this (since I anyway log the rest of the stats).

Anyway, do it for a couple of trips and see what comes out.
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?