Solar Panel Car Charger

What is the threshold between a trickle charger and an actual charger with solar panels?
for say a car battery?
trickle charging is actually charging.
A fast charge on a car battery would be like 6 amps, which a 75 watt panel can do. A slow charge, which is easier on the battery, would be like 2 amps.
5 Watt Solar Panel Review
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