to use as a generator on your 58HP engine ? or to be powered by your 20kW generator head though a VFD?So I need to go after a D/C motor, as I see those readily available at 60+hp. Yes/No?
Nope this is pretty much the only site that I know of for an all in one size fits all vehicle conversion or build for non engineering people. Could be a couple of books out by now and there are several extensive build threads and videos. Googling just returns a computer full of chineseium sales ads any more. Ev west does some videos, but mainly showcase their expen$$ive shiney parts. Most everybody else here in this thread offering advise has some sort of engineering background, automotive, or electrical experience save for the couple that are massively stubborn like woodsmith was back about 7 years ago.Do any of you know of a website that would educate me on more about how all of this works?
No, the motor can't produce 58 hp (43 kW) from only 20 kW of input power. Without a battery, you need a generator which can produce all of the power needed by the motor.I'm talking about utilizing my already 44mpg 4cyl diesel engine to direct-power a 20kW 240V generator head, and then wiring through a controller, directly to a 240V motor that will produce at least the same 58hp as my diesel engine does.
It is absolutely not true. You seem to think that running slowly means "idling", and not consuming fuel. An engine turns fuel energy into mechanical energy, and you still need the same amount of energy to move the vehicle, so running the engine slowly to run a generator gains nothing compared to running the engine slowly (in a high enough gear to get the engine as slow as desired) through a mechanical transmission.My intentional gain is MPG. I don't know how true this is yet, but with an electric drive, I should see upwards of 75-80MPG because the diesel engine will for the most part, just be idling, (1000 - 1200RPM?), to achieve the 60Hz needed to produce the 240V A/C power.
240 V multiplied by 83.4 A is 20 kW with a power factor of 1, so that makes sense.I just checked the tag on the generator head. It says that it produces single phase, 20kW, 240V, 60Hz, 83.4Amps at 1800RPM.
That's the design speed, intended to produce 60 Hz. As I said before, there is no reason to run at specifically 60 Hz; it could produce more power at higher speed if it doesn't overheat, and less at a lower speed... and less at 1800 if the load is lower.So that would be my operating RPM if I am reading this right.
As I said before, if you are running an AC motor without a controller, the AC frequency must change to match the motor speed... and while no one would do that, it would mean that the whole system would act like a single-speed transmission (but heavier, more expensive, and less efficient). If you use a motor controller, then there is no reason to fix the motor speed at 1800 RPM.No reason at all for the RPM's to be all over the place, because I can go outside right now and start it up, hold it at whatever is higher than idle, and it doesn't raise or lower in RPM's all by itself. That makes no sense anyway.
My suggestion is that you get a tach, learn to drive, and achieve your fuel economy improvement at nearly zero cost.I don't have a tach on this truck, so I don't know what 1800RPM sounds like...
The huge difference is that your home is not a vehicle. Everything that uses electricity in your home to turn a shaft controls its own speed, yet you wanted to plug 240 V AC power directly into a motor without any controller like the "engineering" crew on the Enterprise plugging in a "power conduit" and everything just works... but the real world is not Star Trek.Remember this when you're thinking about offering information; I am building a 20kW generator that will produce 240V A/C power, to supply that electricity to an electric drive motor. That's it. The generator just happens to be bolted in my pickup and it has wheels. This would be nothing different than you buying a 20kW generator to provide emergency backup power for your home. I'm just using it in a different application, and regulating the speed of the electric drive motor with a controller. That's all.