100 Amps at 100 Volts from Alternator?

I am interested in building a diesel/electric micro car.

It would need 100 Amps at 100 Volts, not too far from an alternator welder.

The diesel/alternator would drive the car and it would recharge the 96 Volt battery with any excess power.

How would you suggest doing it?

The diesel would run at a constant rpm.

BoyntonsStu

PS It might be a biodiesel.

Reply to
BoyntonStu
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100 amps at 100 volts is 10kw. This is a non trivial alternator. Although you can get a standard automotive alternator to put out much higher voltages than the standard 14.2v needed for charging a standard battery, most of the automotive units will fry if you try and pull much more than 1 kw to 2 kw out of them.

A few suggestions:

1) Tone down your voltage from 96 volts to 36 volts and use aircraft components. You can get some nice 28 volt 160, 200, 300, and 400 amp aircraft genertors that can be tuned up to 36 volts.
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2) Most standard 120/240 generators can be rewired to give you 120 at full output, add in a bridge rectifier for $40 and you have 120DC these are likely to be a bit heavier than a 3 phase alternator.

3) F> I am interested in building a diesel/electric micro car.

Reply to
RoyJ

I think 120 volts might be better for recharging a 96 volt battery.

Reply to
Pat

Also ask this question on rec.crafts.metalworking. There are a goodly number of both electrical engineers and practical technicians there that would delight in assisting you.

Gunner

"Pax Americana is a philosophy. Hardly an empire. Making sure other people play nice and dont kill each other (and us) off in job lots is hardly empire building, particularly when you give them self determination under "play nice" rules.

Think of it as having your older brother knock the shit out of you for torturing the cat." Gunner

Reply to
Gunner

More like 170 VDC. But it will be pulsing, down to 0 VDC 120/second unless you add some storage (eg capacitance or your battery).

sdb

Reply to
Sylvan Butler

Reply to
RoyJ

For a sine wave output (typical of an alternator), the peak is 1.414 * RMS voltage, so the peak for 120vac (rms) is about 170 volts. Fully loaded, it may be down around 120vdc, but as the loading changes, it will go all the way up to 170 volts when lightly loaded. Depending on loading, capacitance etc, you will get the full range. Not good unless you are set up to handle it correctly. The other thing you have to watch if you are switching it on and off when it is up to speed is the inrush current to the caps if they are good sized and not charged -- you can take out some good sized fuses with that current. ANY caps like this should also have bleeder resistors across them (fairly high resistance that will bleed the charge off the cap when there is no input). Large filter caps at 160volts can be lethal !!!!!!!!!!!!!

mikey

Reply to
Mike Fields

Reply to
RoyJ

Yup, and when charging batteries (as per the OP), it will attempt to charge to a peak of 170v.

sdb

Reply to
Sylvan Butler

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