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Dark-Fx

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Great news, the AC WORKS brand adapter that @rivianguy suggested works! Much thanks to you and @Thedude for helping to get this figured out.

So my next bottleneck the natural limit of both the charger itself (32A) and the fact that I’ll never get more than 3600kW out of a 30A outlet pushing 120V.

So I guess we have to figure out either
A) are there any 3rd party J1772 chargers that work on the Rivian and can handle up to 50A?
or
B) can we step up to 240V?

or, I guess, C) take my ~3kW and live with it which isn’t that bad either 🤷‍♂️

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I've got an OpenEVSE wired up for 48A@120V but you normally shouldn't pull more than 40A continuous out of the 50A sockets. I only did it for testing. In the setup you have to tell it to run L2 even though the voltage is only L1.
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strykerwsu

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Great news, the AC WORKS brand adapter that @rivianguy suggested works! Much thanks to you and @Thedude for helping to get this figured out.

So my next bottleneck the natural limit of both the charger itself (32A) and the fact that I’ll never get more than 3600kW out of a 30A outlet pushing 120V.

So I guess we have to figure out either
A) are there any 3rd party J1772 chargers that work on the Rivian and can handle up to 50A?
or
B) can we step up to 240V?

or, I guess, C) take my ~3kW and live with it which isn’t that bad either 🤷‍♂️

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Great to see. Approx how many miles can you add per hour with this method? My family lives in middle of nowhere so is this faster than simply doing 110 from wall If available?
 

Thedude

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Great to see. Approx how many miles can you add per hour with this method? My family lives in middle of nowhere so is this faster than simply doing 110 from wall If available?
A single generator like I have is roughly double the speed (2.9kwh vs 1.5kwh). The parallel kit as shown here will do 3.6kwh. A charge from 50% to 100% would take roughly 43 hours on a standard wall outlet, 22 hours with a single gen and 18 hours on the paralleled gens.
 

Thedude

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I ran a tank of gas through the Generac GP3500io today while charging. I set the truck to 24amps, locked it and walked away. The generator ran for 3 hours and 14 minutes adding 7.5kwh, 6% and 18 miles to the truck’s battery. About 8mpg or $1.20/kWh at the pump price I paid this afternoon.
Rivian R1T R1S It's a hybrid now... R1T charged at 5.2kw with portable generator and charging adapter 85C50E5B-60C4-4655-A899-490C9E1079AC

Rivian R1T R1S It's a hybrid now... R1T charged at 5.2kw with portable generator and charging adapter 41CF3B04-B4F9-4537-B426-A12658331887
Rivian R1T R1S It's a hybrid now... R1T charged at 5.2kw with portable generator and charging adapter F528E715-7CCD-4E51-AC10-D33981447F08



It may be possible to achieve higher efficiency with a slower charge rate. The generator specs claim an 8 hour runtime at 50% load. If it can do that then a charge rate of 15 amps for 8hrs would yield a total gas tank output of 14.4kwh and 43kwh in a 24hr period burning 7.1 gallons of gas. The full rate charge I tested above would yield a 24hr total of 55kwh burning 17.5 gallons.

With two generators and the parallel kit you should be able to charge at a constant 30amp/3.6kwh rate for the full 8hrs since each generator would only be running at half load. That would give a max daily yield of 86kwh burning 14 gallons of gas.
 
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jemkewl

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Not bad for a pinch or traveling to areas with no charging. A five gallon gas tank plus the generator tank should give 180ish miles for those of us averaging 2.4 and higher mi/kwh
 

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Good stuff, thanks for reporting back @Thedude. It seems like the simpler setup of a single generator may be the way to go. Unless I can figure out how to get past the 32A limit of the Rivian charger (i.e. looking for an aftermarket J1772 charger that supports more) or the 120V limit of the parallel kit (somehow stepping up voltage)...adding a second generator to the mix doesn't provide a ton of extra value other than reducing wear/tear on the units by spreading the load. Not sure that's worth lugging the second one around or not.
 

Indy avocado

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I ran a tank of gas through the Generac GP3500io today while charging. I set the truck to 24amps, locked it and walked away. The generator ran for 3 hours and 14 minutes adding 7.5kwh, 6% and 18 miles to the truck’s battery. About 8mpg or $1.20/kWh at the pump price I paid this afternoon.
85C50E5B-60C4-4655-A899-490C9E1079AC.jpeg

41CF3B04-B4F9-4537-B426-A12658331887.jpeg
F528E715-7CCD-4E51-AC10-D33981447F08.jpeg



It may be possible to achieve higher efficiency with a slower charge rate. The generator specs claim an 8 hour runtime at 50% load. If it can do that then a charge rate of 15 amps for 8hrs would yield a total gas tank output of 14.4kwh and 43kwh in a 24hr period burning 7.1 gallons of gas. The full rate charge I tested above would yield a 24hr total of 55kwh burning 17.5 gallons.

With two generators and the parallel kit you should be able to charge at a constant 30amp/3.6kwh rate for the full 8hrs since each generator would only be running at half load. That would give a max daily yield of 86kwh burning 14 gallons of gas.
I suspect you were losing a fair bit due to the cool/cold weather. The efficiency is much lower than I'd expect, but I don't think it's a problem of loading the generator "too heavily" - it likely doesn't fall off much in efficiency above 50% load - ICE engines are best when worked hard.

At least it's something!
 

Thedude

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I suspect you were losing a fair bit due to the cool/cold weather. The efficiency is much lower than I'd expect, but I don't think it's a problem of loading the generator "too heavily" - it likely doesn't fall off much in efficiency above 50% load - ICE engines are best when worked hard.

At least it's something!
It’s also running at 6000’ which reduces the generator output a fair amount, down 21% potentially.
 

OrthoBlock

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For those interested in the topic, rumor has it that the new Fuel Injected Honda EU3200i has also been verified to charge at continuous 2.6kw, and it can even be shoehorned to fit under the powered tonneau cover.
 

Hyfly

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After a recent power outage here in NH I decided to upgrade to a nicer generator to power the house and found an adapter to run the mobile charger from it as well. It powers right up and provides 5.2 kw to the truck. This could come in handy to charge the truck in the next outage in a pinch or to carry in the bed to extend my off-grid range for longer distance overland excursions in Northern Maine and NH where you're much more likely to encounter a moose than a source of electricity.

AC WORKS Electric Vehicle Charging Adapter (L14-30 30Amp 4-Proing to 14-50R) https://a.co/d/hQqXuOo


https://www.harborfreight.com/9500-...enerator-with-co-secure-technology-57080.html

PXL_20230110_201505062.MP.jpg


PXL_20230110_201618637.MP.jpg
Any other adapters or grounders needed?
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