In my experience, they just shut down and do nothing. Most of these things put out a lower voltage, which causes a greater amp draw. As you may have noticed, the panel delivers 17v nominal to a 12v rated inverter... The inverter can work with a voltage "range" but at lower volts, it needs more amps. If we have limited sunlight, the inverter needs more amps and it usually just goes into alarm and shuts off shortly thereafter. 17.7v times 5.7 amps is your 100 watt rating, (100.89 to be exact) Electronic regulation makes the outputs stable. 4 series Lithium Ion cells, multiplied to get 35 amps out would make the small Solar Panel work great, but that adds a lot of expense. The PPS is made to hold a lot of charge all on it's own, perhaps just buying 2 whole sets (8 batts) of the DeWalt Batteries is a more feasible and economic situation? Less flexible, but cheaper.