Excellent. Mine is constantly running at 16A on a 110V 15A circuit. (Nothing else draws current in this circuit). Ideal for use as an emergency charger as it works on both 110v and 220v and can be set to a lower current for any circuit that cannot run at full speed. At 110V it runs about 60% faster than the 10A cable that came with the car. A small note: the 110 to 220 adapter cable that came with it is a size 14. I noticed that it gets quite hot at 16A. I bought a 1 foot 12 gauge cable of the same type to use with this charger and there is no longer a hot cable.
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