We got one of these over a year ago, have used it often in brief power outages (< 24hrs), re-charged on the wall when power came back on. Coffee, phones, microwave; never dropped below 50%. On sale for $650 for the next 2 days.
OUPES 1800 Portable Power Station | 1800W 1488Wh
1800W AC Pure Sine Wave Inverter with 1488Wh Capacity. 10 Outputs, 5 Recharge Options, Smart LCD display. Power for 90% of devices.
oupes.com