Tesla Wall Connector defaulting to 16A charge

Hmmm ... not sure about that bit.

You can "dial down" the AMPS from the dashboard and that location is remembered (GPS). So if you delibrately dial it back up again it should stay there (unless something senses a problem with the circuit.

Is the voltage dropping maybe? (If you have TeslaFi you can see that (Menu = Help : Raw data - you may have to EDIT LAYOUT and change one of the existing columns to CHARGER VOLTAGE, but you can use EDIT LAYOUT after-the-fact). Also "Charge Current Request" - mine sits at 16 until charging starts, and then it increases to 32 ... and when charging is done it drops back to 16.

 

Had a similar issue with a public charger, every time it went to 32A initially then it would stop charging but if I change it to 30A it works fine, I assume it does this in the day time also, so perhaps try lowering the amperage...

 

Might be worth checking TeslaFi to see at what point the AMPs drop ... my thought is that such info could help a Sparky figure out if there is a problem at the outset, or only after everything has started to "strain" a bit

 

Do you perhaps have other stuff coming on in the house overnight - immersion heater etc, that could cause the charger to reduce its draw

 

TWC is either load share or fixed output - its set via internal rotary switch and, in case of load share, via interconnect, one as master, the other slave.

So you need to be ether one or other.

If load share, the master will take the bulk of the charge, the slave will take the remainder. Sounds like Tesla might be slave so maybe worth swapping which charger each car uses, to see if things change. My uneducated guess is that i3 is on Master, Tesla on slave, so charge profile of i3 dictates what Tesla would draw. Makes even more sense if TWC is configured for >32A charging, but doubt that is the case unless you are 3phase.

But you probably knew all that.

 

My car is defaulting to 16A too, even when I set it to 32A and schedule a charge it often drops to 16A, happened this morning, despite leaving the ‘ready to charge’ screen at 32A.

I posted about it today on the TOGUK group, seems we are not alone with this issue!

 

weirdly - I'm the same - just home and wanted to test my new Rolec charger installed yesterday with my New SR+ picked up today.

Starts at 32A but then drops off to 16A as well - this is despite car showing 32A max etc.......

 

I am having this happen this evening and have just increased it to 25amp from the touch screen but it’s still only charging to 17amps.

 

Just did a search and this can apparently happen if the charge plug is not inserted correctly. It will still charge but at a reduced rate. Worth a try.

 

Fixed ! Just unplugged and reattached and it’s now up to the max.

 

Check it again in 5/10 minutes - let me know - mine started at 32A then dropped off after 5/10 minutes to 16A

 

For OP, we have Tesla Wall Connectors sharing a 100A circuit, so 80A to the cars is shared. If only one car is charging we usually get a full 72A (X) or 48A (3). With both cars charging they simply split the available current, 40A to both. For a while the Wall Connectors would only allow 40A if a second car was plugged in, even if it wasn't charging. I think a firmware update might have fixed that a few months ago.

It seems like your two TWC's are either charging two cars at once or acting as if they were. An exact fit to the symptoms if this is a 40A shared circuit. Try disconnecting the i3 before charging the the 3.

The TWC will reduce the current if it senses a voltage drop of something like >10V between starting at 0A and charging at 32A. But I haven't read of a 32A -> 16A reduction in that case.

 

Mine finished charging at the max available.

 

cool - I'll try again tomorrow and see - got plenty of juice in the car for the next few days