Yes the infotainment update changed it. The previous minimum reduced maximum was ambiguous as to the change. Now it is straight math. 40x.9=36. 40x.6= 24

 

Ah, so I think this is based on the car's capability... in other words, eGMP models have 48A on board chargers, so 90% would be ~43A, and 60% would be ~29A. Of course, it would never be more than the EVSE is capable of delivering, so likely on a 40A EVSE, the 90% setting would accept the EVSE's offer of 40A.

Regardless, 60% is probably fine for most folks if they charge daily. In the past, I used my L1 cord that came with my Bolt EV and used a 240V adapter (home made) so it would charge at 240V/12A. That was generally enough to add 120-130 miles overnight, which happened to be my daily commute distance. That is a bit more than most of us need for daily commuting I suspect.

The utility at my new home that will be completed in a few months offers a demand charge Time Of Use rate plan. Fortunately, the demand charge is only applied to the peak amount of energy I would use during peak rate periods, so charging in off-peak it wouldn't matter. But at 29A, I would come just under the 7kW threshold that would put me into a higher demand charge fee. My EVSE (Grizzl-e) has dip switches that can turn down the output down to 16, 24, 32, 40A, so I will likely set it to 24A and leave the car settings at 100% for trips.

 

so likely on a 40A EVSE, the 90% setting would accept the EVSE's offer of 40A

FYI - this is not how it works. I've used it to decrease the current on a lower-powered EVSE and it's proportional to the negotiated rate, not to the car's OBC max.

 

Is there a way to set this value to less than 60%?

I've a lvl 2 tesla wall charger at home and the car draws 6.9kW at 60%. Ideally I'd like it to be around 4kW.

 

I don’t think so, but I’m curious: why do you want to?

 

If it's the latest (WiFi-connected) Tesla Wall Connector, you should be able to adjust the amperage using the Wall Connector's app (which I believe is the same Tesla app that Tesla uses for everything else). That said, I don't know how difficult or easy such a change would be. Earlier versions of the Wall Connector have a DIP switch or dial under the front cover to enable adjusting the amperage. That would obviously be less convenient if you need to make frequent changes; but if the EVSE is wired to a circuit that can only provide a lower amperage, making the adjustment on the EVSE side (whether done through a physical control or an app) is much safer than adjusting it via the car.

 

Chargepoint's app allows adjustment of the current in one amp increments when using their Home Flex EVSE. This is separate from the setting of the maximum amperage during installation.

 

My Grizzl-E mini can adjust amperage from 7A to 40A in 1A increment! It can even be adjusted while changing is on going.