Charging Options for both Model Y and adding R2 to the family

[Bruno723]

I am currently charging the Model Y with a NEMA 14-50 adapter plugged into 240V outlet. What is the best charging solution for 2 cars simultaneously? (Drive less than 100 miles/day, and road trips over 150-200 miles 4x/month, 18K-20K miles/year). I have two separate 100 AMP sub panels with NEMA 14-50 40 AMP breaker in one sub panel, and the second sub panel is available to use for a wall charger or additional NEMA 14-50 outlet.

Options:

1. Add Tesla Wall Charger
2. Add Rivian Wall Charger
3. Add additional 240V outlet and use NEMA 14-50 adapter

TIA for your response...

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[DD4ST]

I would try it first with the one charger to see if your charging schedule allows just one, with DC charging as a backup. But if you need two then you will need to make sure each has a big enough circuit, or derate them to a lower amperage (instead of charging at 40 amp, charge at 20 amp). I believe there may be devices on the market that automatically derate whenever another like device is being used.

 

[JeffnReno]

Going by just the information you provided, I would just add another 14-50 receptacle. I have 2 installed in my garage and have been using them both for years with the mobile EVSEs that came with my Teslas. Much cheaper than Rivians and much much cheaper than a Wall Connector from either. Just make sure the install is done right and good quality recepticles along with proper gauge wiring is used with correct circuit protection.

 

[captainjp]

Stay away from receptacles as your permanent home solution. It’s called a mobile charger for a reason. I would go with 2x hardwired Tesla wall connectors 2nd gen.

 

[JeffnReno]

Stay away from receptacles as your permanent home solution. It’s called a mobile charger for a reason. I would go with 2x hardwired Tesla wall connectors 2nd gen.

Been using since 2016 without any problems but you do you.

 

[captainjp]

Been using since 2016 without any problems but you do you.

Any reputable electrician would disagree with that logic. Just because YOU haven't had any catastrophic failures doesn’t mean it’s the proper way to wire it.
Works fine until it doesn’t and causes your garage to go up in flames…
But you do you

 

[HaveBlue]

Any reputable electrician would disagree with that logic. Just because YOU haven't had any catastrophic failures doesn’t mean it’s the proper way to wire it.
Works fine until it doesn’t and causes your garage to go up in flames…
But you do you

Are you a reputable electrician because EV outlets for apartments are the way it's done in tenant garages? Maybe all the failures of outlets is really non reputable electricians and not a reflection on UL listed hardware that complies with NEC.

 

[Dark-Fx]

Any reputable electrician would disagree with that logic. Just because YOU haven't had any catastrophic failures doesn’t mean it’s the proper way to wire it.
Works fine until it doesn’t and causes your garage to go up in flames…
But you do you

Majority of failures are in situations where the outlet is installed and never touched again. Wire has a tendency to want to creep from thermal stress. Especially if not properly torqued in the first place. There's also a need to periodically check to make sure the cable isn't starting to fall out of the outlet from the same thermal related creep. Very important if there is any kind of physical tension on the cable/outlet.

 

[tdrew55]

I'd go with a Tesla Universal unit, and alternate days for charging each car.

 

[captainjp]

Majority of failures are in situations where the outlet is installed and never touched again

And this is the majority of situations. Users will treat this as their primary charging set up at home and never touch again.

 

[captainjp]

because EV outlets for apartments are the way it's done in tenant garages?

Oh are they?
Plug-in connections create resistance, which generates heat. Hardwiring eliminates the plug entirely, removing the primary point of thermal failure.

Hardwired is the safer of the options. Thats undeniable. Don’t cheap out where it matters most. You're not saving much on cost.

Again, its called a mobile charger for a reason.

 

[HaveBlue]

Oh are they?
Plug-in connections create resistance, which generates heat. Hardwiring eliminates the plug entirely, removing the primary point of thermal failure.

Hardwired is the safer of the options. Thats undeniable. Don’t cheap out where it matters most. You're not saving much on cost.

Again, its called a mobile charger for a reason.

Yea we’re not installing wired chargers for all the tenants unless it’s a shared station. They’ve been fine with 14-50 and 14-30 outlets and supplying their own mobile charger. Zero issues otherwise Rivian Tesla and everyone else wouldn’t offer them. Properly installed 14-50 outlets survive at Rv parks outside under terrible conditions for years.

 

[18650]

This is what I'm using. Renting until I retire so this is the best solution besides just sharing a single EVSE.

https://www.rivianforums.com/forum/...ns-nema-14-50-splitter-not-compensated.45050/

 

[NinjaWrap]

We've had 2 Teslas since 2018 as our only cars, and one Tesla wall connector (installed in 2016). We've always alternated charging between them. It is installed outside on a post at the top of our driveway, between our parking spots so it can reach both without moving cars around.

The wall connector just bit the dust a couple weeks ago 2 weeks shy of ten years, and replaced with a new Tesla wall connector.

 

[gecko10x]

We went ahead and installed a dedicated wall charger (Tesla) for each vehicle when we moved in since we needed to do other electrical work anyway. They are down-rated on 40A breakers, but speed has never been an issue since they're dedicated.

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