Can I use a 100W solar panel connected to a solar generator to charge tool battery chargers?
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I expect most of the other answers correctly say “yes, you can”.
My only caution is that you make sure your “solar generator” has a “pure sine wave” inverter.
Some inexpensive tool chargers do not react well when fed by a “modified sine wave” (MSW) inverter, since those inverters really emit a “square wave” instead of a sine. The first (and last) few milliseconds of each half-wave are really at zero volts. Then comes the burst of power at roughly 13% below the sine wave’s momentary peak, which is also 16.7% above the desired average.
The reason MSW is bad for chargers (and perhaps any transformer or wound motor) is that the square wave contains “all” of the odd harmonics of the fundamental frequency (60 Hz in North America, 50 Hz in most of the world). The design of the transformer inside the charger does not handle those higher frequencies very well, so their energy is lost in the form of heat (and sheer mechanical vibrations) in the windings. Those chargers may not be designed to get rid of that excess/unexpected heat, and damage can ensue.
(thanks to Kevin’s comment nudging me to add the above paragraph)