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Eng sys to power a machine 7 ft lbs of torque for 900 rpm (constant load need) 24volt dc mtr have specs w/ gear red 2-1? Answered

Crushing grain etc, have the model number for the motor, need solar power to run 62.5 full load amps.  - have more info if needed

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steveastrouk
steveastrouk

Best Answer 8 years ago

Sam,

Yes, I'd always suggest a battery bank between the panels and the load, and yes, there would HAVE to be a shut off.

You MIGHT also consider using reflectors to increase the insolation on the panel - the cells will give more power out, without increasing the area/cost.

Steve

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steveastrouk
steveastrouk

8 years ago

We don't charge for extra words.

I reckon that's 900W.

What's the question ?

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frollard
frollard

Answer 8 years ago

regardless of gear reduction, 24v @ 62 amps would be excess of 1600W at the motor shaft would it not? (Agreed, not a lot to go on for the question)

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Jack A Lopez
Jack A Lopez

Answer 8 years ago

The mechanical power works out to about 900 W. That's just 7ft*lb multiplied by 900 rev/min. I mean after converting all the units:
(7.0*1.355818)*(900/60)*2*pi = (9.4907 N*m)*(94.248 rad/s) = 894.48

So this thingy seems to be kinda high powered, for a solar-powered thingy.

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steveastrouk
steveastrouk

Answer 8 years ago

That's what I did too.

The question is, what's the question.....

Steve

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samhall
samhall

Answer 8 years ago

We have a Grain, coffee, seed crushing machine, it needs to be running 900 RPM's to process the material to the correct micron size, we are taking it over seas to West Africa so we need to convert to a DC motor and run it with solar, I have a quote for a motor that I think will do the work but we are not up to speed on the solar panel's we will be needing.

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steveastrouk
steveastrouk

Answer 8 years ago

RIGHT !

Now you're talking !

So, the naiive figure is 900W of panel, that, however is a figure derived from noon normal sun - sun at its highest, and brightest, and the panel orientated perpendicular to that. I think I'd want a high voltage low current panel and an inverter for an AC motor - you'll win on efficiency and reliability over a Shunt wound DC motor.

Shoot for at least 1500W of panel perhaps.

Steve

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samhall
samhall

Answer 8 years ago

OK! Thanks!!!!

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steveastrouk
steveastrouk

Answer 8 years ago

Also, battery backup will protect the motor from low panel voltages.

Don't forget to tick the best answer box too.....

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samhall
samhall

Answer 8 years ago

Steve,
Doesn't the panel supply the battery and the battery supplies the motor and is there a shut off switch?

And thank you, you have been very helpful!
Sam

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steveastrouk
steveastrouk

Answer 8 years ago

An American converting to SI ???

:-O

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samhall
samhall

Answer 8 years ago

We have a Grain, coffee, seed crushing machine, it needs to be running 900 RPM's to process the material to the correct micron size, we are taking it over seas to West Africa so we need to convert to a DC motor and run it with solar, I have a quote for a motor that I think will do the work but we are not up to speed on the solar panel's we will be needing.

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steveastrouk
steveastrouk

Answer 8 years ago

Exactly. So why is the load 900W ?

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samhall
samhall

8 years ago

Oh, ok thanks. It's 900 RPM