- First Name
- Aug 10, 2020
- Reaction score
- Illinois, USA
- Tesla Model Y, GMC Sierra Hybrid 3HB (2-Mode)
PTO is Power Take Off.Can you explain that further? What does the inverter panel have to do with an ePTO and how would that work for a trailer?
ePTO is electric Power Takeoff.
I can think of two ways to take electric power from the vehicle:
- HVDC, which is directly tapping into the battery bus. There is no established standard for this, but I can imagine a big Anderson connector combined with a current-limiting device (circuit breaker). This could easily power the electric motor + driveshaft that everyone's talking about - and the motor could be mounted in the truck, or on the towed-equipment. The problem is that you basically have to be an electrical engineer to know what to do with 800VDC (nominal) at 100amps (or whatever), and to not kill yourself with it -- so I don't expect Tesla's lawyers to allow this. However, from an engineer's perspective, it would be a very effective way to power towed power-equipment.
- Mains-style AC power in the bed of the truck. This basically takes the HVDC ePTO in one side, and has a regular person electric outlets on the other side. It looks like a generator, but it's in the bed of the truck. There's standards for this, and decades of precedent. This is something that you can actually sell, because there are Best Practices that you can follow. This is what the F150 Hybrid has.
What's special about the F150 Hybrid's generator output panel (ePTO to me) is that it comes in 2kW and 7kW sizes. The 7kW size has some hefty outlets.
The American 120V 15-amp outlet is pretty weak. But, a bigger outlets like a NEMA 14-50 had a lot of uses because you can get about 11.75 horsepower through the wire. You can do a lot with that. In my mind, a real ePTO would supply 220V at 50 amps -- or HVDC with some pre-approved accessories.
For my travel trailer, it's powered by 110V at 30amps, so the ideal camper-supoort vehicle could supply that using a variety of outlets (including a NEMA 14-50).
For me the ideal ePTO would be an HVDC plug, but it would come with a generator-like inverter panel that would be designed to match the electrical standards of the customer's nation and provide up to about 12kW. But, those of us who are willing to take responsibility for our own lives (electrically speaking) could remove the panel and have relatively easy access the HVDC source ourselves to power large equipment.
However, my Model Y just has a couple of low-wattage USB-C ports in awkward locations (fixable with an accessory from Digital Ocean). Its USB-C ports can't power a laptop and it doesn't have an 110V inverter that can power a laptop either. The Model Y competitive with gasoline vehicles in its class in terms of the power it will supply, but it's not EV-native in terms of supply accessory-power just yet.
I'm really expecting the Cybertruck to be a big Model Y with stainless steel skin and an extended-range battery -- so I'm not holding my breath for an F150-like inverter feature in the Cybertruck.
An inverter panel which supplies mains power (for your locality) is t the L1 Output of ePTOs.
An inverter panel with a NEMA 14-50 (or the equivalent for your locality) is the L2 Output of ePTOs.
An HVDC connector of some sort is the L3 Output of ePTOs.
Hey, that nomenclature works better than it should!