Author Topic: Evaporator Cooler Conversion  (Read 2836 times)

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TrackerJack

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Evaporator Cooler Conversion
« on: March 18, 2011, 12:31:36 AM »
 I will be replacing the ac motor with a dc motor in my evaporator cooler. I will be using a 3/4 hp dc motor. My question is, 12 or 48 volt, which would you use and why... Thanks

joestue

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Re: Evaporator Cooler Conversion
« Reply #1 on: March 18, 2011, 06:55:45 AM »
48 volt motors are generally more efficient, but you get what you pay for.
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MagicValleyHPV

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Re: Evaporator Cooler Conversion
« Reply #2 on: March 18, 2011, 08:33:56 AM »
Depends on the application, but I generally lean towards higher voltages.  For a given wattage, the reduced amperage of higher voltage loads allows halving the conductor (wire) size. 

TrackerJack

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Re: Evaporator Cooler Conversion
« Reply #3 on: March 18, 2011, 10:38:20 AM »
Thanks, I was also thinking 48, but being that the panels will be just off the bow of the unit and it would take at lease 4 panels and batteries to achieve 48. I decided to go 12., Thanks again.

ghurd

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Re: Evaporator Cooler Conversion
« Reply #4 on: March 18, 2011, 11:07:35 AM »
The motor voltage comes into it too.

A 90V motor on 48V will spin about half the name plate RPM.

A 180V motor on 12V will spin at about 7% of the name plate rating.

Lots of ways to get the same end result.
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TrackerJack

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Re: Evaporator Cooler Conversion
« Reply #5 on: March 18, 2011, 08:14:20 PM »
That's very true. Should of known that. Can't seem to leave the wonderful world of AC.

joestue

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Re: Evaporator Cooler Conversion
« Reply #6 on: March 19, 2011, 03:08:39 PM »
for 3/4th hp i'd go with a higher voltage than 48 if the motors are affordable/available.
Example: there's a 120vdc 1 hp 3400 rpm permanent magnet motor for 40$ on surpluscenter
i have no affiliation for them, but have purchased lots of motors and equip for too good to be true prices over the years.
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