If the display is saying unhealthy extension twine or connection, it is in all probability as a result of it is detecting too massive of a voltage drop? My very own voltage varies loads however I have not seen that error earlier than. This may be voltage fluctuation by the utility firm (like in my case), inside your private home (e.g. when you’ve got massive electrical hundreds elsewhere), or just the circuit powering the automobile. The final two circumstances should not usually occur and will point out one thing is bodily improper along with your electrical.
Examine what voltage it is reporting as effectively when charging (at each 12A and diminished quantities), however most significantly begin taking steps to verify your electrical in your own home is secure.
The explanation why the miles per hour modifications a lot is as a result of it exhibits the rounded web energy delivered, which follows roughly:
Rated Miles per Hour = (Voltage x Amps x 0.94) – 300
After which divides it by a Wh/mi fixed that the automobile is rated for (its effectivity) to characterize it in miles per hour. Pulling a random one since I do not know what mannequin you’ve got, as an instance that is 245Wh/mi
The 300W discount is for overheads like operating the coolant pumps, whereas the 0.94 is to replicate an roughly 94% environment friendly energy conversion (which appears appropriate for my automobile over a spread of charging setups).
So at 12A:
Rated MPH = 115*12*0.94 – 300 = about 997W or 4.07mph (would in all probability present as 4)
And at 9A:
Rated MPH = 117*9*0.94 – 300 = about 690W or 2.82mph (would in all probability present as 3)
I used a decrease voltage for the upper present as a result of voltage sag happens. Notice that whereas 9A is 25% lower than 12A, the facility going into the battery is definitely about 31% much less. That is largely as a result of at decrease charging powers, that 300W overhead turns into a bigger portion of the facility going into the automobile.
Now, the identical purpose it varies by the present, it will probably additionally change on voltage. As above, it may be sensing too massive of a voltage drop, which might additionally imply you might be receiving low or variable voltage, which might be swinging that miles per hour quantity down as effectively.
I am going to attempt to not get too opinion-y right here (neither mine nor others goes to be overly useful ultimately!), however so far as what’s healthiest, simply cost it each night time assuming you employ it most days and are not charging over 90%. There isn’t any well being profit to letting it drop to, say, 20%. However there is a possible unfavorable affect on well being, nonetheless small it might be.