Charging Lightning ER on 50A Circuit with L2 Charger

[itdwebman]

What are people's experiences charging the Lightning ER on a L2 Charger limited to 50A circuit?
How many more hours to go from 15% TO 80/100%
Thanks,

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[Nick503955]

How I figure it:

I would ensure you can recharge your daily driving needs within the cheapest time of use your utility provider has.

I'm in San Diego where my cheapest charge period is midnight to 6a. This provides me 6 hours to charge each day. If I'm driving no more than 60 miles each day, I need a charge rate of at least 10 miles/hour (60/6). By my math above with the Lightning, that means I should use at least a 30 amp circuit.

For that reason and versatility, I intend to replace my 100a Ford Charge Station Pro with a 60a Tesla Universal Wall Connector.

 

[itdwebman]

How I figure it:

Thank you - this is super helpful

 

[16cards]

For a 50A circuit, National Electric Code would require setting the L2 charger to 40A.

40A at 240V is 9.6kW.

ER is 141kWh

15% to 80%... 65% of 141kWh is 91.65kWh at 9.6kW at 90% efficiency is 10.6 hours

15% to 100% is 13.9.

Someone check my math. Battery Management charging curves will vary these rough numbers.

 

[Nick503955]

ER is 141kWh

Extended range battery pack is 131kWh usable, no?

 

[TaxmanHog]

Extended range battery pack is 131kWh usable, no?

True, but we have ~10% ac to dc conversion losses to factor in.

131/.9*.65/9.6 = 9.85 hours

 

[Nick503955]

True, but we have ~10% ac to dc conversion losses to factor in.

131/.9*.65/9.6 = 9.85 hours

There's another 10% charging loss to factor in addition to what I had in my table?

 

[RickLightning]

What are people's experiences charging the Lightning ER on a L2 Charger limited to 50A circuit?
How many more hours to go from 15% TO 80/100%
Thanks,

More hours?

40 x 240 x 90% (10%) loss = 8.64kW.

That's what you need to know. Per hour, that's what the truck will get. Simple math to look at your SOC.

15 to 80%? 65% x 131 / 8.64 = 9.86 hours.
15 to 100%? Either redo the math, or do 20% x 131 / 8.64 = 3.03 additional hours.

Note - you should be charging to 90% daily, not 100%, not 80% (see manual). 100% is for trips, where the range is needed.

If the circuit isn't installed, consider a 60amp circuit with a 48amp charger. How much faster will that be? 48/40 = 20%.

 

[TaxmanHog]

There's another 10% charging loss to factor in addition to what I had in my table?

Nothing more than the 10% your chart accounts for, I just wanted to represent the USABLE value pack capacity and determine the hours it takes at 240 x 40 real amps to regain 65% usage.

16cards introduction of the pack gross capacity coincidently up factors the amount of time.

 

[flyct]

What are people's experiences charging the Lightning ER on a L2 Charger limited to 50A circuit?
How many more hours to go from 15% TO 80/100%
Thanks,

I just did a similar charge last night. I arrived at home with 20% and charged overnight to 85% . According to Ford Pass app, energy added was 85.3 kWh. It took exactly 7 hs and 40 minutes, but that was on a 48 amp output charge.

I’m using a Tesla Wall Connector on a 60 amp hard wired circuit outputting 48 amps or 11.3 kWs. So a Ford mobile charger only outputs 30 amps and around 7 kWh. It would take a little over 12 hours to add 85.3 kWs.

 

[Danface]

Extended range battery pack is 131kWh usable, no?

Ford recommends only charging to 90% unless going on a long trip.

https://www.ford.com/support/how-to...ightning-charging-frequently-asked-questions/

 

[Effonefiddy Lightning]

More hours?

40 x 240 x 90% (10%) loss = 8.64kW.

That's what you need to know. Per hour, that's what the truck will get. Simple math to look at your SOC.

15 to 80%? 65% x 131 / 8.64 = 9.86 hours.
15 to 100%? Either redo the math, or do 20% x 131 / 8.64 = 3.03 additional hours.

Note - you should be charging to 90% daily, not 100%, not 80% (see manual). 100% is for trips, where the range is needed.

If the circuit isn't installed, consider a 60amp circuit with a 48amp charger. How much faster will that be? 48/40 = 20%.

If I have a 50 amp circuit breaker. Could I simply replace it with a 60 amp to get the usable 48amp charge rate from my charger?

 

[Danface]

How I figure it:

I would ensure you can recharge your daily driving needs within the cheapest time of use your utility provider has.

I'm in San Diego where my cheapest charge period is midnight to 6a. This provides me 6 hours to charge each day. If I'm driving no more than 60 miles each day, I need a charge rate of at least 10 miles/hour (60/6). By my math above with the Lightning, that means I should use at least a 30 amp circuit.

For that reason and versatility, I intend to replace my 100a Ford Charge Station Pro with a 60a Tesla Universal Wall Connector.

Why not just change the amperage output?

 

[Maquis]

If I have a 50 amp circuit breaker. Could I simply replace it with a 60 amp to get the usable 48amp charge rate from my charger?

Probably not. Both the EVSE and the branch circuit wiring would need to be capable of 48/60A, respectively. The connection would also need to be hard-wired if it isn’t already.

 

[ExCivilian]

Why not just change the amperage output?

Why do any of that? It can be changed from within the app but also the truck can just be limited to a couple hour charging window. There's no benefit to slowing the charging down to take up the entire 6 hour low rate TOU and seems like it would just introduce additional, unnecessary charging overhead.

But most importantly, the 60A EVSEs won't work with the 3 AWG wire the Charge Station Pro required because the lugs aren't going to be sized for that. The lugs on the Charge Station Pro itself are barely large enough

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