daveo4EV
Well-Known Member
- First Name
- David
- Joined
- Jan 28, 2019
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- Santa Cruz
- Vehicles
- Cayenne Hybrid, 911(s) GT3/Convertable
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- #121
with apologies to @JohnK since he thinks I'm posting too much
thanks to @JP38 for the following update:
thanks to @JP38 for the following update:
UPDATE: if you disable "idle power off" via the PMCC's settings webportal - it's been reported the AMP settings will not be temporary - but will be preserved as long as the unit does not lose grid power - this is good news and can be considered a work around -although at the cost of some minor increase in power consumption since the PMCC will no longer shutdown when idle - screen shot of the PMCC web port with this setting enabled is in this post #201 on this thread- https://www.taycanforum.com/forum/t...pmcc-via-ota-update.12791/page-14#post-190863]
here is summary of the facts so far:measurement of a idle unit with sleep mode disabled show it idles at 8 watts - this is approximately a "cost" of 68 kwh/annually to disable this feature of the PMCC - I have confirmed a unit with sleep mode enabled draws 0 watts when asleep - so it's an 8 watt "delta" to disable sleep mode - which = 68 kWh/annually. details in post #207 - https://www.taycanforum.com/forum/t...pmcc-via-ota-update.12791/page-14#post-190881
- Porsche pushed OTA update for the PMCC version 3014 in the past couple of days
- this version sets your PMCC's default charge rate to 20 amps - this will charge any EV/Hybrid slower than the original 40 amp specification (or 24 amp spec if you're using a NEMA xx-30 supply cable)
- this makes the default charge rate 4.8 kW - NOT 9.6 kW
- this setting can be temporarily overridden via the LCD setting pages on the PMCC's LCD screen - but this setting will be "lost" if the PMCC is powered down or unplugged
- the PMCC's webportal also can set this value higher - but again it's only temporary
- in my case logging in with the "home" user name password and setting the amps to 40 amps does not "retain" the setting across reboots - I tested this with my unit software version 3014 - using chrome on MacOS
- in my case logging in with the "customer service" user name and password and setting the amps to 40 amps does not retain the settings across a reboot - I tested this with my unit software version 3014
- connecting to the unit's webportal is tricky for the average user - since default browser security settings these days tend to refuse to connect to websites with self signed SSL certficates…this is a hurdle for the average user - but problem doesn't matter because the webportal override is temporary just like the LCD screen settings.
- after the OTA update is initially installed the LCD screen charger rate setting screen is Locked and no adjustment can be made - it's been reported that simply rebooting the PMCC restores the ability to temporarily adjust charge rate - but still the adjustment is lost each time the PMCC powers back on and the 20 amp default is restored.
- this update appears to only affect North American units - European PMCC's still appear to be the excellent product years of data and positive customer experience have indicated and no change in charging behavior in these units is apparent or reported at this time - this so far only appears to affect North American units
- also this change only affects PMCC units (the one's with WiFi and an LCD screen) - if your Porsche EVSE does not have an LCD screen then so far your specific unit is not affected by this change (since it doesn't have OTA software updates).
- Release notes have not yet been provided - but may be posted when the update image is posted on Porsche's PMCC downloads site - thanks to @AndiL for this suggestion
- I have not yet discovered a method to adjust the charge rate overrides the default 20 amp value across a PMCC reboot or idle shut down
- Unless you manually adjust the charging rate each time you use your PMCC it is now effectively a 4.8 kW EVSE vs. it's original 9.6 kW specifcation - and it can only temporarily be adjusted above it's new default 4.8 kW charging rate.
- given that nature of this sort of change reasoned speculation is that Porsche has made this change for safety reasons although no specific reasons have been provided by Porsche.
- this change ONLY affects the PMCC EVSE - it does not change your Taycan's (or Hybrid's) maximum charge rate - but you vehicle will charge slower when using an updated software version 3014 PMCC in it's default state
- if your PMCC is not connected to WiFi you are unlikely to have received the update - so no change in behavior for you
- if your PMCC has auto update disabled you are unlikely to have received the update - so no change in behavior for you
- however even with auto updates disabled - if your PMCC is on wifi - an unmodified PMCC will "pester" you with a full screen request to apply the update "now" - you can dismiss this "pester" message, but so far I've found no way to suppress it.
- if your PMCC has been unused and "off" the past couple of days you are unlikely to have received the update - but if you turn it on and do not want the update you'll need to be quick to disable auto-updates and disconnect from wifi when you power it up - using the settings menu on the LCD screen.
- no word or suggestion yet from Porsche as to if this is a permanent change pending some future parts updates or if there is even any follow up expected - stay tuned
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