Home Charging Speeds

[Blaster]

Wanted to start a thread for home charging speeds with details on chargers and cables to see if there is any consistency:

1. ChargePoint CPH50, 14-50 NEMA
2. 9.2 - 9.3kw/hour

Curious how other chargers are doing compared to this unit, especially the 80A units.

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[duncanmaio]

I have the same unit, but hard wired to a 60 amp circuit and set to 48 amps.

I get 11kw until the battery hits 80%.

 

[Blaster]

I have the same unit, but hard wired to a 60 amp circuit and set to 48 amps.

I get 11kw until the battery hits 80%.

How do you set it to 48A?

 

[Roy2001]

220v x 48A = 10.56kW, so the truck get 10.5kWh per hour.

For mobile charger with 32A, 220v x 32A = 7kW, the truck get 7kWh per hour.

Assume ER battery charge from 20-80%, it needs 80kWh. So charge time is 8 hours with a 48A charger, 12 hours with mobile charger.

 

[Maquis]

How do you set it to 48A?

Have an electrician hardwire it on a 60A circuit, then call ChargePoint for them to reconfigure it.

 

[Blaster]

Have an electrician hardwire it on a 60A circuit, then call ChargePoint for them to reconfigure it.

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[duncanmaio]

I don't know that you have to call Chargepoint, but I think you need to start the configuration over from the beginning to select a different amperage - if Chargepoint can do that remotely, that might be easier (although the setup was pretty fast and simple, if I recall correctly).

Hard wiring might require new (larger) wire, and a disconnect depending on the jurisdiction.

 

[wiffleballpractice]

...so the truck gets 10.5kWh per hour...

I'm here just to say thank you for using units correctly.

 

[yed19]

Someone can check my math... but... 80amp*220 V = 17.6KWh theoretical maximum for FCSP. 131*55% (80%-25%)= 72KW. 72KW/17.6KWh = 4.09hrs.

I.e. You can charge your truck from 25% to 80% in 4.09 hrs with FCSP. Theoretically

However, The charge rate is not that high, so would the curve really be affected after 80%? I get that it changes with the DC fast charging, but since the rate is only a max of 17.6, does it really matter?

 

[Maquis]

I don't know that you have to call Chargepoint, but I think you need to start the configuration over from the beginning to select a different amperage - if Chargepoint can do that remotely, that might be easier (although the setup was pretty fast and simple, if I recall correctly).

Hard wiring might require new (larger) wire, and a disconnect depending on the jurisdiction.

Even during initial configuration, you have to call ChargePoint. If you don’t, it defaults to the minimum of 16A.

 

[Blaster]

Just checked with charge point, I am set to 48A, to take advantage of the 60A circuit we would need to hardwire the charger.

 

[Tony Burgh]

I now charge with FCSP when temps are below mid 70’s. I can set max amps at 80 but past measurements show around 77-78 amps. If I have to charge during the day I’ll drop max to 60. No cycling then but I haven’t measured actual amps (too lazy to back out 9 machine bolts in charger case).
The charge times seem to match up with 220X80 watts between 20% and 80% SoC, my normal range.

 

[FlasherZ]

220v x 48A = 10.56kW, so the truck get 10.5kWh per hour.

For mobile charger with 32A, 220v x 32A = 7kW, the truck get 7kWh per hour.

Assume ER battery charge from 20-80%, it needs 80kWh. So charge time is 8 hours with a 48A charger, 12 hours with mobile charger.

The mobile charger will do only 30A. For whatever reason, it's rated at 32A but only advertises 30A to the truck.

Also, most people will have closer to 240V - some older grids in the northeast, in particular, still use 220V. Because I'm close to the substation that serves a lot of rural homes, I get between 245-248V usually. So most people will use 240v * amps to get the watts.

 

[FlasherZ]

I now charge with FCSP when temps are below mid 70’s. I can set max amps at 80 but past measurements show around 77-78 amps. If I have to charge during the day I’ll drop max to 60. No cycling then but I haven’t measured actual amps (too lazy to back out 9 machine bolts in charger case).
The charge times seem to match up with 220X80 watts between 20% and 80% SoC, my normal range.

The FCSP doesn't advertise a 96% duty cycle to the truck, only 94.5%, which translates to 76-78 amps. It seems all Siemens chargers sit on the conservative side of things.

 

[duncanmaio]

Even during initial configuration, you have to call ChargePoint. If you don’t, it defaults to the minimum of 16A.

That was not my experience - the Quick Start Guide has instructions to connect to the unit via wifi and you get one shot at setting amperage. If you don't configure it, it stays at 16 amps. After configuration, there is no way to go back and change amperage.

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