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Discussion Starter · #1 ·
Hi, I haven't seen this discussed. I put a deposit for an i4 M50, and I want to look at setting up a charging point at home. On June 1st, 2021, BMW posted a spec BMW USA News - The New 2022 BMW i4 eDrive40 and i4 M50 that shows the AC single phase charging to be 11kW and 8.25 hours 0-100%, but the latest i4 manual says 11kW tri-phased (no home in the US has that!) and 7.7kW single phase. The installation guide of the BMW wallbox says it maxes at 32A, which, on 240V, also gives 7.7kW. So is it worth getting a direct-connect ChargePoint Home Flex CPH50 (and a non-standard 60A circuit) to get the 11kW, or is the car truly limited to 7.7kW on home AC?
 

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My wife currently has an e-tron and I have an i4 on order. Below notes are what we are currently doing with the e-tron - but expect to carry over to the i4.

We had a 50amp circuit with a 14-50 plug installed. I'd recommend sticking with the 14-50 for flexibility vs a hardwired charger.

We use the charger that came with the e-tron - I expect it will be similar to what BMW delivers with the i4.

I mounted it to the wall using a couple of hooks from Home Depot and just leave it there.

The car has a timer so that it charges overnight and is ready by 6am - time and target charge settings are all programmable within the car or through the app.

I get a consistent 8.6kw which is totally fine since I'm always charging overnight - I don't think you would notice a big difference in experience with 7.7kw.

I'm considering switching to a Juicebox in the future to move the scheduling to the charger instead of the car, but for now this works great.
 

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Discussion Starter · #4 ·
@wdtoddnix , I agree 7.7kW and 8.6kW are not that different if the battery is not depleted, as the case would be on most day. However, I do road trips about once a month that will bring the battery down to 10%, so bring it back up the next day to 80%, which would be my normal non-road-trip desired SOC, would require 57kW, and take 7.4 hours on a 7.7kW charger, 6.6 hours on a 8.6kW charger and 5.2 hours on an 11kW charger. Not a huge difference indeed, but depending on the circumstances and how early I have to leave the next morning (we are working from home now but we'll get back to the office early in 2022), the lower charge rate may be somewhat less than ideal, though I probably can do my commute, run my normal errands, and still get home with enough charge and then bring the morning SOC up over the following few days. I guess, since I have never lived with an EV yet, I might be over-obsessing the whole "recharge to 80% every morning" thing. But you do have to admit having the confidence your car will be recharged in 5-6 hours even if you bring it down to 10% is a nice reassurance...

My wife currently has an e-tron and I have an i4 on order. Below notes are what we are currently doing with the e-tron - but expect to carry over to the i4.

We had a 50amp circuit with a 14-50 plug installed. I'd recommend sticking with the 14-50 for flexibility vs a hardwired charger.

We use the charger that came with the e-tron - I expect it will be similar to what BMW delivers with the i4.

I mounted it to the wall using a couple of hooks from Home Depot and just leave it there.

The car has a timer so that it charges overnight and is ready by 6am - time and target charge settings are all programmable within the car or through the app.

I get a consistent 8.6kw which is totally fine since I'm always charging overnight - I don't think you would notice a big difference in experience with 7.7kw.

I'm considering switching to a Juicebox in the future to move the scheduling to the charger instead of the car, but for now this works great.
 

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The i4 can home charge up to 11kw. In the USA to deliver 11kw you will need a home charger rated at 240 volts 48 amps on a single phase. It will need to be direct wired on a dedicated 60 amp circuit. I have a "Wallbox Plusar Plus" installed in my garage at 240 volt 48 amps single phase. I am ready once I can order and take delivery next year of my i4 M50.
 

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Discussion Starter · #6 ·
Perfect, this is great. This helps a great deal. I'll also look into your wallbox. The amperage and direct wiring is also what is recommended by Chargepoint for their Home Flex wallbox. Thanks much!

The i4 can home charge up to 11kw. In the USA to deliver 11kw you will need a home charger rated at 240 volts 48 amps on a single phase. It will need to be direct wired on a dedicated 60 amp circuit. I have a "Wallbox Plusar Plus" installed in my garage at 240 volt 48 amps single phase. I am ready once I can order and take delivery next year of my i4 M50.
 

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Discussion Starter · #8 ·
Ok, thank you again @Dmeinen , the Chargepoint Home Flex is on order and the electrician is scheduled. The car delivery is next summer but the 30% federal credit currently runs until 12/31/2021 so I'm playing safe.
 

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Ok, thank you again @Dmeinen , the Chargepoint Home Flex is on order and the electrician is scheduled. The car delivery is next summer but the 30% federal credit currently runs until 12/31/2021 so I'm playing safe.
@MinhSATx - curious - why did you order the Chargepoint Home Flex over the Wallbox Pulsar Plus that @Dmeinen has? Looking at the two, the Wallbox seems to have the best of both the Chargepoint and Juicebox (able to connect 2 on the same circuit for 2 cars and also able to automatically govern the amps down to match any loading issues)? Other factors critical to you? Thank you and appreciated.
 

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Discussion Starter · #10 ·
@teamzans , I did look at the wallbox and it's mostly esthetics and availability of info, the Home flex has the cord hanger and a connector port incorporated, and an installation guide readily available on their website with specifics about hard wiring for full 11kW/48A charging. I do know that hard wiring is required above 32A/7.7kW, and the wallbox documention did not inspire as much confidence.
 

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@teamzans , I did look at the wallbox and it's mostly esthetics and availability of info, the Home flex has the cord hanger and a connector port incorporated, and an installation guide readily available on their website with specifics about hard wiring for full 11kW/48A charging. I do know that hard wiring is required above 32A/7.7kW, and the wallbox documention did not inspire as much confidence.
Gotcha. Thank you, @MinhSATx. I would hope a qualified electrician would be able to work around any documentation gaps. Maybe that’s misplaced!
 

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Discussion Starter · #12 ·
Woohoo! I won't have an electrical car for another 6 months but my garage is ready for it! I did have a master electrician install it, he did a great job. 11kW on a 240V/70A circuit. After it powered on, I activated it in the Chargepoint App and it connected on my home Wi-Fi. Ready to go. The wire is 25 ft (7.6m), it can reach the charging port pretty much wherever it is in the car.

Electrical wiring Cable Gas Audio equipment Machine
 

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Discussion Starter · #15 ·
@MinhSATx What type of plug is that? I thought 70A will have to be hardwired.
It's a NEMA 14-50P. I did ask my master electrician twice, but he pointed out that the note in the installation guide says specifically that IN CANADA, you have to hard wire the ChargePoint charger, but apparently in the US it's fine to go through this plug, and it is OK to draw 50A continuous from it, though the breaker does have to be up sized to avoid unwanted tripping, and he refused to hardwire it. So who am I to argue with a Master Electrician?
 
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