Generate amps or Generate watts?

Posted by Smith Oshodin on September 13, 2008, 05:50:33 PM

Re: Generate amps or Generate watts? (Reply #5)

I have uploaded the data sheet of the dehumidifier in this link http://www.sendspace.com/file/zdwiob
Please do look at it and tell me if using solar to generate amps instead of watts will power the equipment.

Posted by Thomas Allen Schmidt on September 13, 2008, 06:55:46 PM

Re: Generate amps or Generate watts? (Reply #6)

Be prepared to dig deep into those pockets my friend because a PV array for this ain't gonna be cheap.
You will see on page 2 of the file;
voltage 220/3/50
FLA 398.1
That means 220 volts/ 3 phase / 50 Hertz
Full Load Amperage 398.1

Figuring 3 phase wattage is a little different than figuring single phase wattage.

Multiply 398.1 times 220 times 1.732 = 151,692 watts divided by 1,000 = 152 kilowatts

You will have to know the number of hours of equivalent full rated power from a PV module you can expect in your region. I will guess 5 hours of equivalent full rated power per day. So...
152,000 watts divided by 5 = 30,400 watts of PV array at the very least.
At US $5.00 per watt not installed thats, US $152,000.00 at the very least. Chances are good that you will have to double the size of this PV array to 5 hours of water production per day.

Here is something a little smaller. It can produce 500 liters per day.
http://airwatercorp.com/detail.aspx?ProductId=7

Posted by David A on September 13, 2008, 07:12:54 PM

Re: Generate amps or Generate watts? (Reply #7)

  wow! you were not kidding when you said you need amps to power this unit. thats 450amps at 220vac.

  you are not gonna like this but lets look at the numbers.

  first off amps, volts and watts are like the holy trinity of power. when we have any two in the equation we can find the third. ie volts x amps = watts or watts / volts = amps
so for example we have a 200 watt pv module with a voltage of 24 volts we get 200/24=8.3 amps

now for the bad news.. our example has 450 amps @ 220 volts 450 x 220 = 99,000 watts of pv! the price tag on that kind of array at $5.00 per watt is a half million dollars. and that is before any derating and other required components.

i'm sorry the news is not better but it looks like a pv solution would be difficult in this installation. perhaps a big diesel generator would be more practical.

best of luck!

Posted by Ken Hall on September 14, 2008, 04:02:53 AM

Re: Generate amps or Generate watts? (Reply #8)

It looks like you sized the array for the hourly requirement, not the daily.

The "dehumidifier" needs to run 24 hours a day to produce the 1700 gallons a day. The best production is at night, as the temperature drops.

So, you are pushing 2400kWh a day, possibly more depending on temperature, humidity, etc. 5 hours of sun would make that array at least 480kW.

I don’t even want to think about a battery bank for that much energy.

« Last Edit: September 14, 2008, 04:15:07 AM by ken hall »

Posted by Thomas Allen Schmidt on September 14, 2008, 08:48:48 AM

Re: Generate amps or Generate watts? (Reply #9)

Smith Oshodin, you do realize that this machine works under the exact same principles as refrigeration? That is, evaporation of latent heat.
Imagine an open pot of water boiling at 212 F on the stove top in the kitchen on a cold winters night. The steam rises and condenses on the cold glass panes of a window. You have probably notice how there is almost always a puddle of water around most air conditioners that are in operation.
Some liquids boil at temperatures below 0 F. These are called "refrigerants." Ammonia is a refrigerant, it boils at -27 F.

Refrigeration was invented before the advent of modern day poly-phasic alternating current electricity.
http://www.refrige.com/articles/absorption-refrigeration-unique-and-profitable/menu-id-46.html

It must be an arid dessert where you want to supply water to a large number of people and or crops to need such a large atmospheric condenser?
Here are some ideas, just to ponder over.
http://www.toromontsystems.com/library/AAAR%20System.pdf

http://www.climatewell.com
When you get to this one click on "industrial" first.

If there is way to refrigerate, then there is a way to condense atmospheric humidity. Electricity does not have to be a part of the equation.
Electricity is not a necessity for life on Earth, it is a desire of those that live on Earth.

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Generate amps or Generate watts?

Posted by Smith Oshodin on September 13, 2008, 05:50:33 PM

Posted by Thomas Allen Schmidt on September 13, 2008, 06:55:46 PM

Posted by David A on September 13, 2008, 07:12:54 PM

Posted by Ken Hall on September 14, 2008, 04:02:53 AM

Posted by Thomas Allen Schmidt on September 14, 2008, 08:48:48 AM

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