# 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?

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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5 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
steveastrouk5 years ago
We don't charge for extra words.

I reckon that's 900W.

What's the question ?
5 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)
5 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.

5 years ago
That's what I did too.

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

Steve
samhall (author)  steveastrouk5 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.
5 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
samhall (author)  steveastrouk5 years ago
OK! Thanks!!!!
5 years ago
Also, battery backup will protect the motor from low panel voltages.

Don't forget to tick the best answer box too.....
samhall (author)  steveastrouk5 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
5 years ago
An American converting to SI ???

:-O
samhall (author)  frollard5 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.
5 years ago
Exactly. So why is the load 900W ?
samhall (author) 5 years ago
Oh, ok thanks. It's 900 RPM