Uh Oh... Clarity Charge is Chattering !

Mr. Fixit. Based on your last post I have an idea. I set my JuiceBox to a max output current of 32 Amps and got the chartering.

The NEC states that any circuit can only run at 80% of rated capacity on a continuous basis. So a 40 amp breaker can only supply 32 amps continuous.

Since the Juice box tells the onboard charger what it’s max capacity is I wonder if the charger is self limiting.

My next full charge I will set the JuiceBox to 40 amps. I have it on a 50 amp breaker. The Clarity won’t charge above 32 so it should never reach the 80% load.

I’ll report the results but It will be a few days.


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Charged_Up said:
I’ll report the results but It will be a few days.
Click to expand...
Sounds good... Mine is a 32A unit (with the 40A breaker) so I can'y try a higher setting.

I expect that your experiment will demonstrate that the Juicebox is not self-limiting. I have seen some conflicting specifications, but I believe the Clarity charger is rated at 30A @ 240V = 7.2 kw. Thus even with a 32A EVSE setting, nothing should be self-limited.

It will be interesting to see what you find... Thanks.
 
So I had a fully depleted battery and set the JuiceBox at a 40Amp charge rate it began to chatter within 30 min or so. Stopped the charge and reset to 24 Amps, no chatter. I’m considering that the fix.



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I have a dumb, non-configurable 48-Amp commercial ClipperCreek EVSE. Should I worry that I can't generate a graph that warns me about this horrible chattering?
 
insightman said:
I have a dumb, non-configurable 48-Amp commercial ClipperCreek EVSE. Should I worry that I can't generate a graph that warns me about this horrible chattering?
Click to expand...

I don’t know what’s going on when the charge rate moves up and down
(Chatter). I saw no change in my car’s performance at all. It’s possibly completely normal behavior for the onboard charger. Lowering the rate seems to eliminate the chatter.



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I'm not sure of your situation but I see the "Chatter" you are talking about on hot days when the fan is running during charging. Mine has always acted that way on hot days so I don't worry about it.
 
@Gary1

I am approaching 4 years with the Clarity. I did not see this once through three summers. Since June of this year, I get chattering every single time (unless I intentionally lower the current setting). So, my conclusion is that something has changed (other than the climate / temperature).
Yes, I get fans running too when it is hot, but nothing different now vs. pre-chatter. Car has always been kept in the garage since day 1.

I'm not so much worried... It's just different, and I would love to know why !
 
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