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 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Fri Mar 09, 2018 11:23 am 
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Joined: Mon Jul 21, 2014 5:26 pm
Posts: 429
6K is what you get from a commercial 30A 208VAC EVSE. Most commercial EVSE's run off of a wye that supplies 120VAC and 208VAC unlike iif t was powered from a delta. In addition most EVSE's are 30A max not 40A.

208 vs 240V is a 25% hit already then add the 10A loss for a 30A EVSE. For all but Tesla powered cars that is not a problem My eGolf charged at 30A from my 40A EVSE.

The public EVSE's at both Long Beach Mercedes and Mercedes of Anahein run off of 208VAC and they are 30A max.

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2014 Cirrus White B Class (Totaled)
2016 Urano Gray eGolf
I loved the VW but it was too hard to get into for my aged body.
I am back to another 2017 Cirrus White B250e
Blind Spot Assist, Performance 3 and Sahara Beige interier


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 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Thu Mar 15, 2018 6:52 am 
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Joined: Mon Jan 05, 2015 10:55 pm
Posts: 57
GlennD wrote:
My car charges at 40A at 240VAC all the time. The range extender makes no difference.

I'm glad to hear this.
If we get into another B-class, it will certainly have the range charge feature and the electrically defrosted windscreen.
Charging at home, I'll be able to supply it with 40A and will desire to do so when we're charging two EVs per night.


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 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Thu Mar 15, 2018 9:29 am 
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Joined: Thu Dec 11, 2014 9:12 am
Posts: 755
bcurious,

Having the range plus on my 2017 vs non on my 2014 has gotten me through this winter on a diet of once a week full charge with top ups at one of my work locations a couple times a week. This is versus twice a week with my 2014. There are other factors of course, temperatures have cooperated.

I am not getting into an argument with Mr. GlennD but at least in my car, the rate of sucking juice into my 2017 with range plus activated varies and the only way I can get full speed intake is either by deselecting range plus or doing a quick calculation in my head and putting in a predetermined departure time that forces the car to suck juice at fastest possible rate.

With a home charger like GlennD has, it sounds like the rate is selected on the box, not the car. At commercial stations or outlets where I charge, it seems as if the car decides how fast it wants to suck juice.

Sorry for the use of slang for those offended.

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MB '17 B250e; MB '06 E500W; MB '81 380SL


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 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Thu Mar 15, 2018 10:45 am 
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Joined: Mon Jul 21, 2014 5:26 pm
Posts: 429
Assuming that there is enough current available the car will charge at the full current (40A). If less is available then the car will match the available current. Phil Childs has a box to step up the 208VAC. Other than that nothing can be done about the 208VAC. The box has a transformer and you plug the EVSE cable into the box and in his case the box's Ji772 cable into his RAV4 EV. That gains him 25%. The pilot runs straight through but the L wires are stepped up.

It is unfortunate that commercial power is 208VAC vs home power at 240VAC . That places most commercial EVSE's at a disadvantage compared to home L2 EVSE's.

_________________
2014 Cirrus White B Class (Totaled)
2016 Urano Gray eGolf
I loved the VW but it was too hard to get into for my aged body.
I am back to another 2017 Cirrus White B250e
Blind Spot Assist, Performance 3 and Sahara Beige interier


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 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Thu Mar 15, 2018 11:52 pm 
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Joined: Fri Aug 25, 2017 1:25 am
Posts: 6
GlennD wrote:
My car charges at 40A at 240VAC all the time. The range extender makes no difference.


Same with my 2015 model. Full rate in with or without R+ and/or predefined departure time. 3ph-16A-400VAC-11kW. Only rate resisting factor seems to be ambient temperature. Cold car gives lower rate and warm car right after driving enables full rate.

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 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Fri Mar 16, 2018 1:34 pm 
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Joined: Thu Dec 11, 2014 9:12 am
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Thanks PVA. In my new 2017 it seems to matter with R+ what is set for departure time. Hm.

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Jeff in NYC
MB '17 B250e; MB '06 E500W; MB '81 380SL


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 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Fri Mar 16, 2018 6:06 pm 
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Joined: Mon Jul 21, 2014 5:26 pm
Posts: 429
Well Jeff believe what you want. The car's charger does not care it the range button is pushed.

The only thing affecting charge current is the EVSE and how it is wired. Both of the dealers I have worked with have 30A EVSE's hooked up to 208VAC. At 30A and 208VAC the max is just over 6000 watts. If a 40A EVSE is available then at 208VAC then it will charge at 40A X 208VAC or 8320W. 10K requires 240V! Unlike my eGolf or my Leaf's the power factor is not 1, It is a few percentage off, Volts X Amps is not quite accurate. True power is Volts X Amps X the power factor.

_________________
2014 Cirrus White B Class (Totaled)
2016 Urano Gray eGolf
I loved the VW but it was too hard to get into for my aged body.
I am back to another 2017 Cirrus White B250e
Blind Spot Assist, Performance 3 and Sahara Beige interier


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 Profile  
 
 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Fri Mar 16, 2018 6:26 pm 
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Joined: Mon Jul 21, 2014 5:26 pm
Posts: 429
An extreme case of power factor is a HP power supply I own. At full load it draws 3750 Volt amps or 2200W. Switching supplies are known for bad power factors. Most cars are compensated at the rated charge level. A lab test supply obviously is not compensated.

I tested the supply when I received it but since it requires 240VAC it just sits. To use it I would have to run a 20A 240VAC circuit to my workshop. Unless I really need high power that is not going to happen.

_________________
2014 Cirrus White B Class (Totaled)
2016 Urano Gray eGolf
I loved the VW but it was too hard to get into for my aged body.
I am back to another 2017 Cirrus White B250e
Blind Spot Assist, Performance 3 and Sahara Beige interier


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 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Sat Mar 17, 2018 9:02 am 
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Joined: Thu Dec 11, 2014 9:12 am
Posts: 755
GlennD,

Yes, agree believe what we want.

In my case, testing at same commercial charging stations would indicate for my 2017 selecting R+ does matter. At 3 different locations, wo R+, I get the same draw, 1.2 kWh or 6.6 kWh. With R+ selected, it varies based on Predetermined Departure time drawing at rate needed to achieve 100%.

So in my case, for my car, having tested, I believe it matters. Not having a home charger which can override, I make no warranties.

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Jeff in NYC
MB '17 B250e; MB '06 E500W; MB '81 380SL


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 Post subject: Re: Range Extender Tips & Tricks
PostPosted: Sun Mar 18, 2018 11:26 am 
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Joined: Mon May 18, 2015 6:15 pm
Posts: 23
My EVSE controls the max power that can be supplied (~10KW in my case) and the B-ED charger controls the charging power levels (up to the EVSE max) based various car conditions and settings (e.g. battery temp, current battery level, departure time, range extender on/off, etc.) that are not visible to the EVSE. I have a 2015 B-ED with range extender and 40A/240V home charging (JuiceBox EVSE) and my observation when range extender charging is on the charger in B-ED will charge using max power (~10KW) until the normal non-extended battery level is reached then taper off power down to ~3.5KW over the last ~30 minutes of charging.


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