Inverters really are a "crap shoot" unless high-end and power certified. My experience with charging 18 volt power tools with inverters has been as already stated. No major issues with any of the small cheap inverters. Just a little slower. Same for cell phones.
But . . here's one for you. I recently got a so-called Ramsond Sunray "true sine wave" 3000 watt more-pricey inverter. I had to in order to pass building inspecting since a mod-wave will not run smoke alarms and GFIC outlets properly. An inverter that can be hard-wired is also necessary for inspection. Guess what? It will NOT run my Dewalt or Ryobi 18 volt chargers. Yet, all my cheap mod-wave inverters do the job just fine. If just goes to show that very few of them make a true sine-wave unless you spend $1000s on a unit. I checked AC output with a RMS volt meter and this "true sine-wave" unit is only putting out 109 volts AC. All my other inverters put out 114-120 VAC when read with RMS. If read with a non RMS el-cheapo voltmeter, the mod-waves only read around 85 volts (but work fine).
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