[RE-wrenches] pump questions

[Bob-O Schultze]

Todd,
The easiest way to do this is to use the Grundfos pump sizing software. Regrettably, it only runs on a PC. You can input the specs of the module, the head and the GPD desired and it will size the array for you. Once you know the # of modules in series you can use the Imp and Vmp derated for temperature which will get you in the right ballpark for sizing the conductors. Won't be accurate, but close 'nuff.
Good Luck, bob-O

On May 30, 2013, at 3:29 PM, Todd Cory wrote:

this question is part 2 about the customer with the used astropower 75 watt modules -

he has a grundfos 11sqf-2 already set by the well driller. the input specifications for the cu200 pump & controller are 30 to 300 vdc, 1400 watts, 8 amps. 

this will initially be running array direct and i am trying to figure out the wire loss from the modules to the cu200 controller. to do that i need voltage and current numbers. im assuming the higher the voltage the lower the running current? 
from the specs above: 1400 watts divided by 8 amps = 175 volts... so if i feed this with closer to 300 volts would that mean the running current would drop to around 4.6 amps?

thanks for the help,

todd


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