Charging duration too long

[Acevolt]

I was at the Santa Monica mall EVSE today and they now have a 3 hour time limit, which would have been fine, except my charge time seems to have doubled. My Entune app showed that I have a current range of 75 miles and four bars until full on extended charge with a time remaining of 3 hours 32 minutes. I used to charge at around 20 miles an hour in Santa Monica and now its down to around 10. I understand that Blink reduced their EVSE output current to 3.3kW, but I didn't think that Chargepoint did. My Chargepoint app showed that I was charging at 5.868kW, but if I really was, I should have charged at near 20 miles an hour. Has anyone noticed extended charge times? Could it be the cold weather?

 

[TonyWilliams]

I was at the Santa Monica mall EVSE today and they now have a 3 hour time limit, which would have been fine, except my charge time seems to have doubled. My Entune app showed that I have a current range of 75 miles and four bars until full on extended charge with a time remaining of 3 hours 32 minutes. I used to charge at around 20 miles an hour in Santa Monica and now its down to around 10. I understand that Blink reduced their EVSE output current to 3.3kW, but I didn't think that Chargepoint did. My Chargepoint app showed that I was charging at 5.868kW, but if I really was, I should have charged at near 20 miles an hour. Has anyone noticed extended charge times? Could it be the cold weather?

Are you basing all this on the "data" from the GOM ? If so, it's a flawed way to do it. I suggest counting the 16 "fuel bars" and calculating the range. Sadly, that won't help you between 80% and a 100% charge since the folks at Toyota decided you didn't need to know.



45.0kWh total - 100% SOC
41.8kWh usable- 95.1% SOC = [( 41.8 + 1.0) / 45]
35.0kWh usable- 80.0% SOC = [( 35.0 + 1.0) / 45]
1.0kWh unusable- 2.2% SOC = [1.0) / 45]



Miles Gained per Hour Charging @ 87.5% charger efficiency
70F Ambient temperature - hotter or colder will decrease miles gained
Amps/Volts -- Where ---- City Drive ----- 65mph
------------------------- 2.7 miles/kWh - 3.4 miles/kWh

12 / 120 ------- Any ------ 2.8 miles ------ 3.5 miles (supplied cable with car)
16 / 120 ------- Any ------ 3.8 miles ------ 4.7 miles (JESLA with NEMA 5-20)
12 / 240 ------ Home ----- 6.8 miles ------ 8.6 miles (EVSEupgrade.com mod)
16 / 208 ------ Public ----- 7.5 miles ------ 9.5 miles (2013 LEAF EVSEupgrade)
16 / 240 ------ Home ----- 8.9 miles ----- 11.2 miles (2013 LEAF EVSEupgrade)
20 / 208 ------ Public ----- 9.4 miles ----- 11.9 miles (2013 LEAF EVSEupgrade)
20 / 240 ------ Home ---- 11.0 miles ----- 13.9 miles (Clipper Creek LCS-25)
24 / 240 ------ Home ---- 13.6 miles ----- 17.7 miles (JESLA w/NEMA 14-30 or 10-30)
30 / 208 ------ Public ---- 14.8 miles ----- 18.7 miles (typical public J1772)
30 / 240 ------ Home ---- 17.1 miles ----- 21.6 miles (rare public J1772)
40 / 208 ------ Public ---- 18.5 miles ----- 23.4 miles (Tesla Roadster/Clipper Creek)
40 / 240 ------ Home ---- 22.7 miles ----- 28.5 miles (JESLA w/NEMA 14-50 or 6-50)


Draft 3:

Here's what 50% looks like, with 10 of 16 fuel bar segments illuminated. Disregard what the GOM says:

http://www.myrav4ev.com/forum/viewtopic.php?p=251#p251

 

[fooljoe]

My Entune app

Gotta stop you right there... The "Guess-o-Meter" range is nearly useless, and the charge time remaining estimated by Entune and the car is very inaccurate.

four bars until full on extended charge

"4 bars until full" means 4 bars until a full normal charge. The bars don't adjust at all when you're in extended charge mode - basically there are ~4 "hidden bars" beyond "full."

I was charging at 5.868kW, but if I really was, I should have charged at near 20 miles an hour

Then you'd be a very efficient driver! that 5.9kw is how much power is passing through the Chargepoint unit, not how much is getting into the battery - you have to multiply by ~80% charging efficiency to get that figure. That means about 4.72kw into your battery, or about 14 miles/hr at a more realistic 3 miles/kwh.

Have you tried RavCharge? It will give you a much more accurate time to charge and range estimate than the Entune app or car gives you, and also provides useful timers for starting charges and climate control when you want (not when the car thinks you want.)

 

[Acevolt]

I have made this trip about 15 times from Palmdale to Santa Monica Mall (around 65 miles one way) and it usually takes me 3 hours to fully charge. This trip it took 5 1/2 hours to fully charge. So disregarding all the apps, its taken twice as long to charge. That is the real issue and even through the Guess-O-Meter is wrong, in the past it was showing a much higher guess than it is now.

 

[occ]

Did you registered for the chargepoint account? I usually just login and check the status there instead of any dash info.

 

[JasonA]

I can tell you from VAST experience there at SM chargers (both the Clipper Creek and CP units) that the voltage pretty much sucks, especially when it starts filling up and they're all cranking away.. I've seen the voltage drop to 191 volts..

But those units are "technically" 208 units but I always see 201-203.. so you're lucky to pull 6400watts on a good day. Think about that. Not 7.2kw.

I've kept a DB of almost every charger that's I've been to and the voltages.. pretty surprising!

Some are in the 250's!!

 

[Acevolt]

I was also using the Chargepoint app which indicated the charger was supplying 5.868 kW of power while the Toyota app indicated I had 3 hours 32 minutes remaining with a current. The 5.868 would indicate 28Amps at 208V which should be around the 18.7 miles according to Tony's chart. This is what I have seen in the past, but it really ended up taking 3 hours 30 minutes to charge with an indicated range of 111. This would seem to indicate that the real power being provided is 16Amps, not 30Amps as indicated by the Chargepoint app.

I will have to give RavCharge a try and see how accurate that is.

Thanks for all the info.

 

[TonyWilliams]

This would seem to indicate that the real power being provided is 16Amps, not 30Amps as indicated by the Chargepoint app.

I will have to give RavCharge a try and see how accurate that is.

Thanks for all the info.

That sounds like the Blinks that were all cranked down to 17 amps or so, after burning a few charge ports.