I saw the same video last fall and pulled together a similar setup.
The Soul EV and Leaf internal DC-DC converters for the 12V battery are limited to 1.7kW continuous, but I got a much larger size to handle the one time surge current for our fridge. I will never run it over 1300-1500W to keep the car’s DC-DC converter from getting taxed.
Here’s the inverter:
Power Bright PW2300-12 Power Inverter 2300 Watt 12 Volt DC To 110 Volt AC https://www.amazon.ca/dp/B002AMPGE6/ref ... 38GGRGaK6f
Here are the other bits and bobs I ordered to connect it: if you’re handy, making some of these yourself is obviously cheaper:
300Amp Circuit Breaker with Manual Reset,Inline Fuse Inverter for Car Marine Boat Bike Stereo Audio https://www.amazon.ca/dp/B01MTLM9EM/ref ... Ugh9Ft1Q58
1 Foot (12 inch) Red Single 4 AWG Gauge Battery Cable Wire by Spartan Power, Positive Cable Great for Connecting Batteries in Parallel Or Series Made https://www.amazon.ca/dp/B072JZRMQ9/ref ... kEJ6rK19O4
BNTECHGO 8 Gauge Silicone Wire Ultra Flexible 6 Feet high Temp 200 deg C 600V 8 AWG Silicone Wire 1650 Strands of Tinned Copper Wire Stranded Wire Mod https://www.amazon.ca/dp/B074P4HSF2/ref ... 5HwNmX57oK
For grounding to the chassis with these clips:
CERRXIAN 2 Piece 90mm Long... https://www.amazon.ca/dp/B01FFEH4ZO?ref=yo_pop_ma_swf
And I could only get these in the US with the right wire gauge and length for power transfer:
Preassembled 4 AWG 2 Foot Alligator Clamp Battery Cable Set with 5/16" Ring Terminal by Spartan Power Made in the USA https://www.amazon.com/dp/B079C5H6DL/re ... TRdbdhtG3A
Based on the Nissan Leaf forum information I saw on a similar setup, it may also be a key point to ground the negative terminal of the inverter and the inverter ground to the vehicle’s chassis.