5 Watt solar charger

[micallen]

How much would a 1.5 watt or a 5 watt solar charger charge a motorcycle battery?

Harbor Freight Tools has their 5 W solar charger (normally $60) on sale for $30.  Would it do much?

[woodsrider250-2]

Sure!  Most of the motorcycle float chargers are only 1.25-1.5w.  Keep in mind that the solar unit probably only puts out it's rated power in direct bright sun.

[Polymer-2]

Micallen wrote

How much would a 1.5 watt or a 5 watt solar charger charge a motorcycle battery?

Harbor Freight Tools has their 5 W solar charger (normally $60) on sale for $30.  Would it do much?

I'd say that at best it would only maintain an already charged battery.
5 watts at 12 volts is only .41 amps.