Semi-relevant question: there are many battery-based "generators" up to 500Wh on Amazon. Are there any in the 1.5-2KWh range? We often get outages during winter

Semi-relevant question: there are many battery-based "generators" up to 500Wh on Amazon. Are there any in the 1.5-2KWh range? We often get outages during winter and it'd be good to have something that could drive a furnace for a day or so.