Calculate DC appliance KWh

[PNW_Steve]

Something like this: https://www.ebay.com/itm/DC-20A-7-10...7334c625b23254

[PNPmacnab]

There are DC watt meters that give you watts, max amps, etc and total watts as long as you keep them powered for about $10.

[ula]

Hi
i have a dc refrigerator. Is there something like a kilawatt meter that can help me to calculate the actual energy usage?