Are these "device chargers" for BEVs like electric submarines or something? ;-)

In the broader SF Bay Area, our recent PG&E bills for a 50 year old single-family home without air-conditioning is under $150/mo, with a couple fridges, electric clothes dryer, and a half-dozen laptop class computers. That's averaging about 8-9 kWh per day (250-280 kWh/month).

Last winter, our bill ramped up to over $400/mo for a few months, due to heating with natural gas.