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Post by richimaint on Jul 7, 2022 8:15:16 GMT
HI all,
How much current does the OBD11 dongel consume when it is permanently plugged in?
richimant
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Post by dv52 (Australia) on Jul 7, 2022 23:12:24 GMT
richimaint : Not sure that I really understand your question - of course, the electrical current varies greatly depending on what the dongle is doing.
However, I suspect that your question relates to what engineers call the "quiescent current" - which means the current drawn by an electrical device when in a state or period of inactivity or dormancy.
If you think about how this definition might fit an OBD11 dongle - I think you will agree that the conditions equate to when the car's ignition is OFF and after a period when the CAN network has put the installed modules into a sleep state (no lights illuminated). In this state, the car's native equipment is drawing the lowest electrical current from the battery.
If an OBD11 dongle is still plugged-into the OBD port when the car is effectively "asleep" and it is NOT CONNECTED to a tablet/mobile-phone - the only additional battery load should be the red LED that will be illuminated (note: there will also be a small nascent current from the electronic circuits inside the dongle, but I suspect this will be minor).
So, if my logic above is correct (happy to be advised otherwise), I suspect that the quiescent current of an OBD11 dongle would be in the range 10-20 milli-amperes.
Don
PS: I stress that my guess assumes to the dongle is NOT "Connected" - if you leave the dongle plugged-into the car's OBD port, this condition might not apply (meaning, you may forget to "disconnect" the dongle)!
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