[Gytis]

Hello all,
I need some advice/input. We live in Ann Arbor, MI and have a cottage in Marquette, MI (450mi).
There is a EA DCFC in Gaylord (235mi from destination). 150kW and 350kw.
The last one is Mackinac City, MI (165mi from destination) 62kW.

What's the best strategy for charging. Go to 100% in Gaylord, and stop for a "top off"?

I understand the charging slows above 80%.
Advice is appreciated!!

 

[sciencegeek]

Does the cottage have a 240V/32amp outlet that you can charge at?

 

[Gytis]

yes. that's not a problem. the issue is going up there!
trying to make charging stops as efficient as possible

 

[CommodoreAmiga]

I'd play around on ABRP and you can run through various scenarios to find the optimal for your situation.

 

[sciencegeek]

I'd hammer it to Gaylord, charge there to 90%, and then drive a little more conservatively to the cabin.

P.s.: You might want to give EA a call; their app and web site do not currently show the Gaylord location, whereas Plugshare does show it with successful charges on 9/30.

P.p.s.: Large pack, right?

 

[LoudMusic]

The best way to make charging stops as time efficient as possible is to only charge enough to reach your next stop. Any more is wasted time. Tesla encourages arriving with 10% in the battery. I often shoot for around 5% in my Model Y. On longer legs of a trip those estimates can drift quite a bit. I don't have my Rivian yet but on a Tesla screen while you're charging you can have the navigation displayed and it will show you the estimated arrival percentage of your next destination.

 

[Coneal]

Charge to 80% in Gaylord and then charge to ~60% in Mackinac City (I am assuming a 25 mile reserve at 60%. You can adjust that up or down based on your comfort with and knowledge of your Rivian’s efficiency). The Rivian’s charge curve drops to ~50KW above 80% charge, so you’ll be better off charging in MC at 62KW than waiting to charge at 50KW above 80% in Gaylord.

Check out the InsideEVs article on the Rivian’s charge curve below:

Rivian R1T Charging Analysis: From 0 To 100% State-Of-Charge

The Rivian R1T is the next all-electric vehicle that we will analyze in terms of fast charging capabilities.

insideevs.com

 

[sciencegeek]

Charge to 80% in Gaylord and then charge to ~60% in Mackinac City (I am assuming a 25 mile reserve at 60%. You can adjust that up or down based on your comfort with and knowledge of your Rivian’s efficiency). The Rivian’s charge curve drops to ~50KW above 80% charge, so you’ll be better off charging in MC at 62KW than waiting to charge at 50KW above 80% in Gaylord.

Check out the InsideEVs article on the Rivian’s charge curve below:

Rivian R1T Charging Analysis: From 0 To 100% State-Of-Charge

The Rivian R1T is the next all-electric vehicle that we will analyze in terms of fast charging capabilities.

insideevs.com

I disagree because the charge curve of the R1T ...

How Long Does It Take To Charge The Rivian R1T: We Find Out

We completely drain the battery of a Rivian R1T electric pickup truck and then recharge it fro zero to 100% to see how long it takes.

insideevs.com

... shows that it only drops to less than 62.5kW at ca 80%. So basically, you'll never want to make a ChargePoint unit part of your plan. Keep it as a backup in your plan in case the faster chargers are unavailable, but don't use it in your planning.

 

[loudog3114]

I only bother charging to 100% from home (before a road trip) or at a hotel with a chargepoint (or some other brand). Too slow otherwise.

 

[Coneal]

Assuming that you can‘t make it to the final destination on 80% charge, which is the case in this scenario, it doesn’t make sense to charge past 80% if there is a faster charger (even though it is only 62KW) further along in the trip. The stop in MC will be much shorter to gain the required range than charging to a higher SOC in Gaylord. No doubt that a 62KW charger is slow, but it is relative to the charge rate that the R1T can take above 80%.

 

[sciencegeek]

Yeah but it's an extra stop, so spending a couple extra minutes charging to 90% is better than the extra stop

 

[CommodoreAmiga]

Yeah but it's an extra stop, so spending a couple extra minutes charging to 90% is better than the extra stop

Not necessarily. When I road tripped in ICE vehicles I found I had to stop more often than the vehicle needed to refuel. Don’t charger longer than necessary on any given stop if you can make it to the next stop and charge again there.

Also, the fastest ‘cannonball’ runs seem to be when the teams stop more often and unplug early.

 

[sciencegeek]

I agree, however in this case the extra stop would be at a 62.5kW charger. Different story for a 150kW or 350kW charger ...

 

[EaglesPDX]

Yes...charge to 100% at home to start is always the best strategy. Longer range and faster charging when you do charge if you use the range to get to a charger with 10%. Longer range so you can driver faster, any unplanned route changes even if no charging advantages.

Fast DC charging and 100% charging if done infrequently, won't impact the battery degradation and range loss.

 

[westone]

I use this too. Great website!

I'd play around on ABRP and you can run through various scenarios to find the optimal for your situation.