Question about Goal Zero Sherpa

Practically no, only in principle yes, if the charger draws less than 100W of power. But beware: this is extremely inefficient (a lot of power loss/heat). And the capacity of the Sherpa is far too small: with just under 100Wh, it can theoretically charge a car battery to about 10% - but because of the losses (charger gets warm) probably more like 5%. A car battery typically has a capacity of about 100AH at 12V, which is 1.2kWh. To charge the car battery, a GoalZero Yeti 1000X would have to be used, which, if the car battery is not completely dead, should be just enough for a charge.