I'm familiar with inverters which will change 12volts DC to 120 volts AC. These are available at different power levels depending on your requirement. I suspect manufacturers are capable of inverting 500 VDC to 120 VAC if presented with the need.
Here's a site with inverters which will allow you to run much more than a laptop; so yes you can run a kettle or toaster and more.
Power Inverter | Pure Sine Wave Inverters | Marine Inverter