I suspect the 2019 would handle leaving the adapter plugged in, but I try to remember to unplug it during out of town trips anyway.
My car was last charged two nights ago and just driven a few short trips since then. It has been sitting for about 5 hours since the last 3-mile short trip (with OBDII adapter plugged in) and the OEM 12V battery is reading 12.576 so I am not worried about the charging algorithm or battery condition. I understand Nubo's concern about CAN Bus interference, but I like to let Leaf Spy log data while I drive and I like the audible tire pressure warning that I can set for the pressures I run (48 psi cold and alarm set for 42 psi with the run flat tires I have now). The car's built-in pressure alarm does not activate until pressure gets really low.LeftieBiker said:I suspect the 2019 would handle leaving the adapter plugged in, but I try to remember to unplug it during out of town trips anyway.
Given the rest voltages I'm seeing on our Gen 2 Leafs, I wouldn't count on that.
GerryAZ said:My car was last charged two nights ago and just driven a few short trips since then. It has been sitting for about 5 hours since the last 3-mile short trip (with OBDII adapter plugged in) and the OEM 12V battery is reading 12.576 so I am not worried about the charging algorithm or battery condition. I understand Nubo's concern about CAN Bus interference, but I like to let Leaf Spy log data while I drive and I like the audible tire pressure warning that I can set for the pressures I run (48 psi cold and alarm set for 42 psi with the run flat tires I have now). The car's built-in pressure alarm does not activate until pressure gets really low.LeftieBiker said:I suspect the 2019 would handle leaving the adapter plugged in, but I try to remember to unplug it during out of town trips anyway.
Given the rest voltages I'm seeing on our Gen 2 Leafs, I wouldn't count on that.
The dongle draws a small amount of power if just plugged in. If the car is OFF, the power for the dongle is minimal when the phone app is not running. If the phone app is running, it causes the dongle to send commands to collect data from various modules. This keeps the modules from going into low power (sleep) mode so the net effect is to increase the power draw from the 12V battery.LeftieBiker said:The dongle becomes active when plugged in, even with no phone nearby. I don't know if the energy used increases while the app is running.
GerryAZ said:The dongle draws a small amount of power if just plugged in. If the car is OFF, the power for the dongle is minimal when the phone app is not running. If the phone app is running, it causes the dongle to send commands to collect data from various modules. This keeps the modules from going into low power (sleep) mode so the net effect is to increase the power draw from the 12V battery.LeftieBiker said:The dongle becomes active when plugged in, even with no phone nearby. I don't know if the energy used increases while the app is running.
GerryAZ said:The dongle draws a small amount of power if just plugged in. If the car is OFF, the power for the dongle is minimal when the phone app is not running. If the phone app is running, it causes the dongle to send commands to collect data from various modules. This keeps the modules from going into low power (sleep) mode so the net effect is to increase the power draw from the 12V battery.LeftieBiker said:The dongle becomes active when plugged in, even with no phone nearby. I don't know if the energy used increases while the app is running.
Yep.lorenfb said:Have you measured the Leaf's standby current with and without the dongle plugged in? If so, what were those values?
Remember, different dongles function differently in standby, so a universal value doesn't apply.
GerryAZ said:I have tried several different brands (cheap ones ordered online) and OBDLink units purchased directly from their Phoenix facility. Some work better than others with different Android devices. I am currently using an OBDLink MX that I originally purchased to use with ICE vehicles because it is the most stable with the Motorola unlocked phone that I keep in the LEAF for Leaf Spy. They all draw minimal current when the car is not on (based on the fact that they don't change the voltage measured at the battery terminals when plugged in or unplugged). The voltage at the battery terminals really drops for a short time when doors are unlocked or something else happens to wake up the car's computers. One of the things that either frequently wakes up the car's modules or keeps them awake is having Leaf Spy running so that it is requesting data over the CAN Bus.
lorenfb said:GerryAZ said:I have tried several different brands (cheap ones ordered online) and OBDLink units purchased directly from their Phoenix facility. Some work better than others with different Android devices. I am currently using an OBDLink MX that I originally purchased to use with ICE vehicles because it is the most stable with the Motorola unlocked phone that I keep in the LEAF for Leaf Spy. They all draw minimal current when the car is not on (based on the fact that they don't change the voltage measured at the battery terminals when plugged in or unplugged). The voltage at the battery terminals really drops for a short time when doors are unlocked or something else happens to wake up the car's computers. One of the things that either frequently wakes up the car's modules or keeps them awake is having Leaf Spy running so that it is requesting data over the CAN Bus.
You really need to actually measure the current, i.e. get a clamp-on amp meter or carefully attach a series amp meter.
You can't rely on a change in battery voltage to indicate an excessive current, which could be in excess of a few hundred milliamps( ma),
e.g. remember the battery problems with TCU hanging. Typically the standby current (ECUs asleep) should less than 60-70 ma.
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