That would only be true if people are charging huge batteries that sustain their full home energy usage. If they're only charging small batteries to sustain th

That would only be true if people are charging huge batteries that sustain their full home energy usage. If they're only charging small batteries to sustain the most important devices in their homes, the usage will still be much lower. Additionally, peak/off-peak is a thing. The grid may have excess power from wind and solar when conditions are idea. Charging your batteries during those times will not have any negative effects.