Seeking Dual EV Charger Recommendations for Mercedes EQB & Rivian R1S

[NY2LA]

Does anyone have recommendations for a dual EV charger that can efficiently charge both a Mercedes EQB and a Rivian R1S? If I were to go with just one charging station, any suggestions? I’ll be installing a 240V outlet in my garage.

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[BigSkies]

I have the Grizzl-e Duo, and it works fine. You're fundamentally limited on charge rate when charging both simultaneously, but I've always been able to charge two EV's overnight without issue.

I could potentially see an issue if both cars get driven to near-0% on the same day, but that never happens in my house.

 

[MacO512]

I'd suggest to check if hardwire the charger instead of an outlet is better. You can do a 60amp circuit hardwire (instead of max 50amp on receptible), its cheaper (receptacle requires expensive GFCI breaker), plus there are fewer points of failure.

I know in my garage a major part is figuring out how you will most often park the two vehicles and where the charge ports are and then the best spot for a charger.

Installing two Tesla Wall connectors have good power sharing options.

 

[NY2LA]

I'd suggest to check if hardwire the charger instead of an outlet is better. You can do a 60amp circuit hardwire (instead of max 50amp on receptible), its cheaper (receptacle requires expensive GFCI breaker), plus there are fewer points of failure.

I know in my garage a major part is figuring out how you will most often park the two vehicles and where the charge ports are and then the best spot for a charger.

Installing two Tesla Wall connectors have good power sharing options.

Will I get a faster charge with a 60-amp circuit hardwire? Rather than a max 50 amp?

 

[sub]

My Rivian and Tesla are sharing a single 30A*240V circuit.

Usually we just alternate and plug each one in every other day, although the car that is plugged in is usually full before bedtime so we could switch the charger over to the 2nd car if we really need both to be completely full in the morning.

 

[MacO512]

Will I get a faster charge with a 60-amp circuit hardwire? Rather than a max 50 amp?

Yes, the car will pull 48 amps on a 60amp circuit vs pulling 40 on a 50 amp circuit.

If you use a portable EVSE they normally are limited to pulling 32 amps (as some 14-50 outlet breakers are 40 amp circuits).

 

[mikehmb]

Will I get a faster charge with a 60-amp circuit hardwire? Rather than a max 50 amp?

Remember that the actual current delivery should be limited to 20% under the circuit, so if you have a 60-amp circuit, you would de-rate your charger to draw 48 amp maximum. 40 amp for a 50 amp circuit, etc.

And hardwire is absolutely safer than plug. The industrial NEMA 14-50s are significantly better than the dryer ports, but even then - go hardwired if you can.

 

[sub]

Will I get a faster charge with a 60-amp circuit hardwire? Rather than a max 50 amp?

You can only use 80% of the rated capacity. So a 60 amp circuit can give you the full 48 amps that a Rivian can take. A 50 amp circuit can do 40 amps if hardwired but most non-hardwired chargers will actually only let you do 40*.8=32amps because 40 amp circuits use the same plug so the charger can't be sure if it is plugged into a 40 amp or 50 amp circuit. to be safe, it assumes the lower.

So yes, hardwired to 60 amp circuit is significantly faster than a 50 amp plug. 50% faster.

But how much do you actually need? How much do you typically drive in a day?

Does it really matter if you finish charging at midnight or 2:00am? As long as you're full before you wake up, the extra speed is not going to be noticed.

If you expect to frequently return home with a completely empty battery and need it to be 100% full before you wake up so you can drive 300 miles again the next day, then you should get as much power as you can. But most people don't do that and even a much lower powered circuit will be more than enough to replenish overnight what you use on a typical day.

 

[MacO512]

My Rivian and Tesla are sharing a single 30A*240V circuit.

Usually we just alternate and plug each one in every other day, although the car that is plugged in usually full before bedtime so we could switch the charger over to the 2nd car if we really need both to be completely full in the morning.

Yeah if your charging overnight anything 240 volts will be fine.

I actually temporarily setup a single reception household outlet as a 240 volt 20 amp circuit when I bought my first Tesla before the wall connector was installed and was surprised it always charged the car plenty.

However today I keep my EV at 50% charge. Studies show 57% and less state of charge have the lowest degradation.

Any day I want more than 50% range I schedule however much charge to finish in the morning (up to 100% charge, it's overstated how bad that is) So the higher amps allow me to keep the state of charge lower and minimize degradation with no impact on utilizing full ~300 mile range.

 

[MacO512]

Remember that the actual current delivery should be limited to 20% under the circuit, so if you have a 60-amp circuit, you would de-rate your charger to draw 48 amp maximum. 40 amp for a 50 amp circuit, etc.

And hardwire is absolutely safer than plug. The industrial NEMA 14-50s are significantly better than the dryer ports, but even then - go hardwired if you can.

Yeah, a quality receptacle is a must. Seen dozens of melted ones because they were the cheap home Depot ones for an oven not an EV charging non-stop for 8-12 hours. Oven/dryers/etc all cycle on and off which is far less stress on the house electrical system.

Those quality receptacles get expensive, as do GFCI breakers.

Very very few use cases I'd recommend a plugged in EVSE over a hard wired unit

 

[NY2LA]

You can only use 80% of the rated capacity. So a 60 amp circuit can give you the full 48 amps that a Rivian can take. A 50 amp circuit can do 40 amps if hardwired but most non-hardwired chargers will actually only let you do 40*.8=32amps because 40 amp circuits use the same plug so the charger can't be sure if it is plugged into a 40 amp or 50 amp circuit. to be safe, it assumes the lower.

So yes, hardwired to 60 amp circuit is significantly faster than a 50 amp plug. 50% faster.

But how much do you actually need? How much do you typically drive in a day?

Does it really matter if you finish charging at midnight or 2:00am? As long as you're full before you wake up, the extra speed is not going to be noticed.

If you expect to frequently return home with a completely empty battery and need it to be 100% full before you wake up so you can drive 300 miles again the next day, then you should get as much power as you can. But most people don't do that and even a much lower powered circuit will be more than enough to replenish overnight what you use on a typical day.

Yes, very accurate! I work at home, so I don't travel that much

 

[Mark_AZR1T]

We have two 60-amp hard wired EVSE units in our garage for our Rivian's. 90% of our charging is during the day (big solar), with an occasional overnight on the grid during the summer. I'd always do a hard-wire set-up for safety and a significantly higher charge rate.

 

[HaveBlue]

I plug my car in every 4 days and could probably go a week if I used more than 50% of the battery regularly.

 

[beatle]

A single EVSE with two outputs sounds nice, but having two EVSEs placed where you need them would be better. I'd recommend a couple of Tesla UWCs. They can share the same circuit.

 

[doit82]

Does anyone have recommendations for a dual EV charger that can efficiently charge both a Mercedes EQB and a Rivian R1S? If I were to go with just one charging station, any suggestions? I’ll be installing a 240V outlet in my garage.

checkout neocharge. That’s what we use for our model Y and R1T on one charger.

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