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Re: 80% Charging on 2014-17 LEAF

Posted: Sun Jan 29, 2017 9:10 pm
by magico13
reeler wrote:Wouldn't it be easy enough to have an IFFTT script that could ping the LEAF for state of charge and command a ChargePoint Home adapter to turn off once it hits 80%. ChargePoint could put this into their app too easily enough.
I'm not sure if there's any IFTTT support built in, but it'd be really easy to write a python script (or anything else for that matter) that queries the car's charge through the Nissan API and then turns off the EVSE when it gets to a certain charge. I've been thinking of doing that for my 2015, but I don't have an EVSE with wireless control, just a dumb plug and charge one. When I eventually get a different EVSE I'll probably end up doing that, since I'd like to set up a way to charge to ~80% when I plug in at 6pm and then finish charging to 100% before I leave for work the next morning. That way it isn't sitting fully charged all night but is still usable in the evening.

Re: 80% Charging on 2014-17 LEAF

Posted: Sun Jan 29, 2017 10:53 pm
by SageBrush
A smartphone could query the OBDII for SOC information and then IFTTT
You might even be able to tell the car through OBDII to stop charging.

Re: 80% Charging on 2014-17 LEAF

Posted: Mon Jan 30, 2017 6:47 am
by powersurge
wouldn't it be so easy if you could just set a dial on your evse for how long you would like to charge?? Man, they had egg times going back to the 1940s or 50s...

Re: 80% Charging on 2014-17 LEAF

Posted: Mon Jan 30, 2017 9:58 am
by SageBrush
powersurge wrote:wouldn't it be so easy if you could just set a dial on your evse for how long you would like to charge?? Man, they had egg times going back to the 1940s or 50s...
If you know the time you are leaving in the morning it is easy enough to set a delayed start time that matches the charge you want when you leave.

E.g.,
My battery holds 20 kWh when full, so each 10% SoC is 2 kWh
My EVSE sends 6 kWh an hour to the battery
-- so 10% charge every 20 minutes

Say I arrive with 30% SoC and want to leave at 7:30 am with 80%
100 minutes charge time needed ( 50% * 20 minutes/10%)
I set the delayed start timer to 5:50 am

If people would like to print out a nomogram to keep in the car for easy reference, let me know.

Re: 80% Charging on 2014-17 LEAF

Posted: Mon Jan 30, 2017 6:07 pm
by ltbighorn
Probably, for those with CarWings (or whatever they call the current bit). Not for those of us without a telematics module. Could in theory do the same with an OBDII wifi connector, but from what I understand you'll run into issues with prematurely drained 12V battery.

Re: 80% Charging on 2014-17 LEAF

Posted: Mon Feb 06, 2017 10:32 pm
by DaveEV
SageBrush wrote:A smartphone could query the OBDII for SOC information and then IFTTT
You might even be able to tell the car through OBDII to stop charging.
This is the best option - I wonder if OVMS will have support for this.

Re: 80% Charging on 2014-17 LEAF

Posted: Fri Feb 24, 2017 3:13 pm
by karamba
Nothing can be easier.

Cars full charge is 26h at 110V 6h at 220V 6.6kW

So 20% of the full charge is 5h at 110V and 1h 20 min at 6.6kW
Your charging indicator on the panel tells you how much would it take to complete the charge to 100%.

Now all you need to do is to deduct 5h or 1h 20 min from that time depending on the charging mode and set your timer to that time.

Lets say you are charging at 6.6kW and the panel tell you it will take 3 hours to charge to 100%. Deduct 1h20 min from it and set your timer to end the charge in 1h 40 min.


You do the math only once. Every time you charge use the magic number 5h for 110V and 1h20min for 6.6.kW

Re: 80% Charging on 2014-17 LEAF

Posted: Fri Feb 24, 2017 3:19 pm
by cwerdna
^^^
Your math won't work. When the car nears full (~94 to 96% or so on the % SoC display), the car begins ramping down and enters a bounce phase. Very little energy makes it into the car in the last hour or so.

Also, the time estimates aren't very good. Sometimes they're significantly longer than actual. If you take off 1 hour, 20 minutes as you describe, you will be WELL past 80%.

Also, US voltages are not 110 nor 220 volts.

Re: 80% Charging on 2014-17 LEAF

Posted: Fri Feb 24, 2017 5:32 pm
by jjeff
^^ Agree, I figure I get 30%/hr gain with my 6.6kwh charger, from relatively low SOCs to mid 90s SOC, I also get 20%/hr gain with my 19a EVSE.
This is with a 12 bar 24ah battery.

Re: 80% Charging on 2014-17 LEAF

Posted: Sat Feb 25, 2017 8:46 am
by karamba
Then just charge your car to over 80% and drive it till it is at 80% Now notice how much time it say is left to charge it to full. Since then use that number every time to set your timer.
About 110v and 220v I often here that argument from people who do not work with electricity.
Here is a nice article about the issue.
https://www.quora.com/Is-the-power-syst ... -or-235VAC