RX7 EV First High Voltage Test

[djmomocrx]

great ! and still rotary !!! ( in other way ) all the electric engines have a rotor inside !!!

[vid009a]

Excellent, what type of motor is that ?

[mopar43v3r]

pretty sweet, but why an rx7? i dont understand all these ev vehicles use something which doesnt deserve to be destroyed, use a kia or something.

[AudiMouse]

The RX7 already had a bad engine in it. I actually rescued it from the wrecker. It had already been partially parted out. Had to get a bumper, brakes, and several interior pieces for it. It's also a very good platform for an EV conversion. Front engine, RWD, light, aerodynamic, etc.

[mopar43v3r]

good reason

[TakayaFreeman]

It's not really being destroyed. It's simply being remade to something more powerful. From the looks of it, it looks like the RX-7 can now eat some muscle cars alive.

[nephilymbass]

I want to build an ev truck and put a couple 2 foot by 4 foot solar panels in the bed to charge the batteries. Has anyone done this yet? What would I need to regulate the electricity from the solar panels so I'm not putting to much power into the car?

[AudiMouse]

Solar panels put out such a small amount of power. In order to charge a battery pack, you need a higher voltage than the batteries in order to cause charging current to flow. If you have a 120v pack made up of 10 12v batteries though, you can rewire the batteries in parallel to get 12v. As long as you have more than 12v coming from your solar cells, contactors to do that. It's also dangerous because the sequence of opening and closing the contactors is important to prevent shorting the pack.

[overunitydotcom]

If you use a motor for 3000 Volts and maximum

5 to 10 amps you can also get 15 to 30 KWatts of output power( minus motor losses), but then you draw only low amps and the battery charge will

last much longer...so much bigger range for the electric car. So the only way to have an efficient electric car is going the Newman motor type way anduse High Voltage and low current with multiple NiMH batteries in series to get around 1000 to 3000 Volts supply voltage...

[dcr1tch]

3000V battery is going to be a bit on the large side to deliver 5 to 10 Amps.

Doesn't really matter what voltage / current you pick - apart from power loss in the cable due to heating - which is perhaps one good reason for using higher voltage. The charge on the battery will last no longer.

[paytontech]

@dcr1tch actually, there are losses in all parts of the circuit, including the battery, motor and controller. In fact, the resistance of the battery limits the minimum voltage you can use for a given target output.

[overunitydotcom]

Better use a series of NiMH batteries,so you get about 3000 Volts and use low current and a Newman type motor, so you draw only low amps,which makes the batteries last much longer and due to the graphite-copper sparking will generate negative current spikes back to the batteries, which will keep the batteries charged all the time.

This is the only way an electric car makes sense..

Also better use maybe NiMh batteries cause they are cheaper and don´t have a memory effect...

Regards, Stefan.

[TommeyLeeReed]

Cool.

[TheCopilot91]

what type of batteries are those?

[AudiMouse]

40ah NiCad cells from commercial aircraft.

[TheCopilot91]

You mean like starter batteries? I certainly hope they're not anything like car batteries. I've heard that car and marine batteries die rather quickly because they're built for short spurts of voltage, not anything like running an Ev.

Other than that, they're really nice and small. How much do they run?

[AudiMouse]

They're much better than lead acid batteries. I got them for free from my former employer (an airline). there's a Yahoo group called BB600 that has more info and leads for buying them.

[TheCopilot91]

neat, I'll keep that in mind.

[LeviMan2001]

what was the speedo showing? 30? was that the top speed?

[AudiMouse]

Speedo was showing just over 40. That was with 78v. Final pack voltage is 120v. At 90v, I got 55mph with no load.

[cant7think7clearly]

Well done!

[dreamyear]

high voltage is so dangerous...i wish i have gut to try the plasma arc...