Cord and plug connected max amperage

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mbrooke

mbrooke

Batteries Included
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United States
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Technician
A cord and plug connected appliance, such as a car charger, is the current limit 100% or does the 80% rule apply for over 3 hour periods?
 
mbrooke said:
A cord and plug connected appliance, such as a car charger, is the current limit 100% or does the 80% rule apply for over 3 hour periods?
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what 80% rule are you talking about?

IMO, any kind of charger is not a constant load and thus does not fall under the 3 hour rule at all.

Continuous Load. A load where the maximum current is
expected to continue for 3 hours or more.
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The nature of a charger is such that it cannot be at maximum current for very long.
 
The load is continues, but the part that gets me is that this is only a single receptacle rather than a branch circuit with a mixture of continuous and non continuous.
 
A car charger would not meet the definition of a continuous load as Bob stated since it will not operate at it's maximum current for 3 hours or more.
 
infinity said:
A car charger would not meet the definition of a continuous load as Bob stated since it will not operate at it's maximum current for 3 hours or more.
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Well, unless it is a low power charger doing a 9+ hour total recharge of a Tesla Roadster. (The high current output period will last at least 3 hours and possibly 7 or more.)
 
GoldDigger said:
Well, unless it is a low power charger doing a 9+ hour total recharge of a Tesla Roadster. (The high current output period will last at least 3 hours and possibly 7 or more.)
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You might be right, I was thinking a charger that was less intuitive and has the largest load when the battery is discharged but diminishes as the battery begins to hold the charge. But even in your example would it always be at it's maximum?
 
infinity said:
You might be right, I was thinking a charger that was less intuitive and has the largest load when the battery is discharged but diminishes as the battery begins to hold the charge. But even in your example would it always be at it's maximum?
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It would be at its maximum at least up to the point where the battery was 80% full, and even then would be reduced only as the battery temperature started to rise.
The key point is that the maximum output current of that particuar charger is so small compared to the maximum acceptance rate of the battery (probably on the order of C/7, as compared to 2C.)
 
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