What is the fastes way to charge the Roadster on the road?

ffylling said:

What is the fastes way to charge the Roadster on the road?

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Towed behind a truck using regen.

raymond said:

Towed behind a truck using regen.

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There are thermal limits associated with regen and these usually kick in at around 5 minutes.

A 1.5 is only capable of max regen of 70A the 2.X are capable of 90A.

Basically a High Power Wall connector properly set up gives you the same charging speed
over a sustained period of time.

PRJIM said:

A 1.5 is only capable of max regen of 70A the 2.X are capable of 90A.

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Yes, but that's 90A at 400V, or 36kW compared to 16.8kW for an HPC. I agree you'll probably burn out PEM or battery after five minutes.

I have tow charged at full regen for about 25 min in 80 deg f weather with no evidence of thermal limiting. On level ground at 60 mph. I also drop about 4000ft whenever I leave Lake arrowhead using quite a bit of regen and have seen no limit kicking in. Temps have been over 100f at the top and 115f at the bottom.

efxjim said:

I have tow charged at full regen for about 25 min in 80 deg f weather with no evidence of thermal limiting. On level ground at 60 mph. I also drop about 4000ft whenever I leave Lake arrowhead using quite a bit of regen and have seen no limit kicking in. Temps have been over 100f at the top and 115f at the bottom.

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Strange, I have done a few sustained downhill drives and after a while my Roadster disables Regen (not range mode). I pinged engineering a few years ago about this and that is the answer they gave me.

efxjim said:

I have tow charged at full regen for about 25 min in 80 deg f weather with no evidence of thermal limiting. On level ground at 60 mph. I also drop about 4000ft whenever I leave Lake arrowhead using quite a bit of regen and have seen no limit kicking in. Temps have been over 100f at the top and 115f at the bottom.

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It amazes me that you and others have actually done this - tow charged for 25 min! Never thought anyone would have the guts to try it! I've always wondered what would happen if you sustained 40kW charging for more than a minute or two. My hat goes off to you.

Without tow-charging and absent a 70A HPC or 70A J1772, you can make your own portable charger capable of 70A like I did. The challenge comes in connecting it to a power supply. Sometimes I install my own 90A breaker temporarily which is then wired to an industrial plug/socket capable of 100A into which I plug the portable charger. This is much faster than 70A chargers found at 3 phase wired buildings in the US because you can usually get 240v instead of 207v.