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If only the Model X had a 110 outlet (like Ford & Rivian).......

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Reality is that Rivian has a 120v socket, and Tesla X does not. If that is the most critical thing for you, then buy the Rivian.

The Cybertruck comes with multiple 120V outlets, plus 240V service. This is due to the remarkable 48v electrical system. It will provide bi-diredtional electricity to power your home in the case of a utility power outage.

There are limitations to what a 12V electrical system can provide.

Some of the newer EV (like Cybertruck) traction batteries are 800 V.
 
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Reality is that Rivian has a 120v socket, and Tesla X does not. If that is the most critical thing for you, then buy the Rivian.

The Cybertruck comes with multiple 120V outlets, plus 240V service. This is due to the remarkable 48v electrical system. It will provide bi-diredtional electricity to power your home in the case of a utility power outage.

There are limitations to what a 12V electrical system can provide.

Some of the newer EV (like Cybertruck) traction batteries are 800 V.
Does 48 vdc system have anything to do with it?
 
In addition to using my Rivian's 120V outlet for camping, I just tested it yesterday with my EcoFlow power banks. I set it to 1400W, and it worked great to charge the power banks while they were busy powering my house.

240V would be even better!
 
In addition to using my Rivian's 120V outlet for camping, I just tested it yesterday with my EcoFlow power banks. I set it to 1400W, and it worked great to charge the power banks while they were busy powering my house.

240V would be even better!
In my business, I have an EcoFlow battery as well and do the same thing, use the truck to charge the EcoFlow battery which provides 3600 watt output. So, I get the best of both worlds. Exceed the Rivian's 1500w output and could charge the EcoFlow for days without recharging the truck. I do wish the Rivian had more power like the Ford does, the Cybertruck now does, the Chevy & GMC trucks will far exceed all of them, but this is a good workaround.
 
In my business, I have an EcoFlow battery as well and do the same thing, use the truck to charge the EcoFlow battery which provides 3600 watt output. So, I get the best of both worlds. Exceed the Rivian's 1500w output and could charge the EcoFlow for days without recharging the truck. I do wish the Rivian had more power like the Ford does, the Cybertruck now does, the Chevy & GMC trucks will far exceed all of them, but this is a good workaround.
Is it OK to charge an EcoFlow with a Tesla? And assuming it is, is it OK to charge and use (discharge) an EcoFlow (Delta 2) at the same time?
e.g. Can I plug my EcoFlow into my Tesla (in order to charge the EcoFLow) via the 12 volt plug AND plug my home refrigerator into the EcoFlow at the same time?
 
Is it OK to charge an EcoFlow with a Tesla? And assuming it is, is it OK to charge and use (discharge) an EcoFlow (Delta 2) at the same time?
e.g. Can I plug my EcoFlow into my Tesla (in order to charge the EcoFLow) via the 12 volt plug AND plug my home refrigerator into the EcoFlow at the same time?
The maximum current available at any of the 12V outlets is 10 amps, at 13 volts. which means about 130 watts. Plus those accessory plugs are disabled when the car is off. If you have a 2022 or newer, remember the low voltage is 16 (not 12). I am thinking this doesn't make much sense.

But then I just installed a 30 kW Kohler generator to backup my whole house, including the ability to charge my car at 240V and 40 amps. So my perspective might be slightly off.
 
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The maximum current available at any of the 12V outlets is 10 amps, at 13 volts. which means about 130 watts. Plus those accessory plugs are disabled when the car is off. If you have a 2022 or newer, remember the low voltage is 16 (not 12). I am thinking this doesn't make much sense.

But then I just installed a 30 kW Kohler generator to backup my whole house, including the ability to charge my car at 240V and 40 amps. So my perspective might be slightly off.

My experience with the outlets in a 2019 MS and 2023 MX both had the voltage on the cigarette outlet and USB-C drop so much if more than 5 amps were pulled that either the device would power off or limit the power draw. I think the outlets are (or at least were on specific vehicles) limited to about 60w max.