2020 Chevy Silverado
I was wondering if it is possible to replace the factory inverter with something better. I've read elsewhere that it is located behind the back seat. I just want to make sure that it is possible before doing any work.

 

You would have to also upgrade the cabling, fuses, etc. to handle more power. It might as well be a new installation. I also would never run it off the main starting battery. If you want to start using some heavy power consumers and appliances, you're going to need to need a deep cycle auxiliary battery system.

 

I wouldnt be surprised if i need to upgrade the wires and fuses. Would be nice to use the original setup as much as possible to make things easier. If I replaced the inverter, it wouldn't be with anything bigger than 1000 watts.

 

Isn't that around 10x the power of the OEM system?

1kW needs around 83 Amps so you're looking 4 AWG cable (similar to booster cables, or what's on your starter). That amount of power will flatten most normal car batteries in short order. You should probably do a bit of research first.

 

Just as an FYI - for a 1000 watt max inverter, that means it will be pulling at least 75 - 80 amps of power at 13.2 VDC assuming a 95% conversion efficiency of DC into AC. (Remember power out equals power in divided by 0.95). That is a hellacious amount of current on the DC input side!

 

that's generous. Many automotive inverters operate at around 85%. Worse for inductive loads.

 

I just dis a quick google search on DC to AC inverters and it returned an efficiency of 90 - 95 %, so yes, I was being generous. I guess I should have cited something like 75 - 80 percent in order to come up with a 100 amp draw on the DC side.

People just do not understand basics like power out is less than power in, so for a 1 amp draw at ~120 VAC (120 watts), they are going to need close to 10 amps @ 13.2 VDC). And they wonder why circuit breakers pop, fuses blow and wiring insulation melts when they try to run household "light loads" from a vehicle.

 

With what I would be using, my max draw would be 510 watts 4.25amps

 

You just ignored everything that chemman JUST explained.
510 watts @ 12V = 42.5A
I think you need to leave this to a professional to install.

 

Google says different