Hi Todd (and Allen & Bob-O),
You can also do the pump sizing online, using WebCAPS from Grundfos, if
you don't have a PC handy: <http://net.grundfos.com/Appl/WebCAPS>, then
click on "Sizing," and "Renewable Energy Systems". You'll still need to
enter module data, since their database only includes their modules. You
can also select locations, units, etc. like in the PC version.
Best,
Louis
On 5/31/13 10:30 AM, Allan Sindelar wrote:
Bob-O and Todd,
In theory you're right, Bob-O. I find the program awkward to use,
given that it thinks in some weird (Danish?) way, that I don't use
often enough to remember how to navigate. But in this case my bigger
concern would be how to input data for a bunch of old used Astropower
75s. Astropower's been gone for over ten years, I think, and data
isn't likely to show up on the backsheets. WINCaps doesn't account for
module degradation, either.
Todd, I might have a copy of a module spec sheet for the AP75 in our
files at the office. Not sure, as we never used any, but I collected a
lot of that old crap. Contact me off list on Monday if you need me to
look.
Allan
*Allan Sindelar*
[email protected]_ <mailto:[email protected]>
NABCEP Certified Photovoltaic Installer
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder and Chief Technology Officer
*Positive Energy, Inc.*
3209 Richards Lane (note new address)
Santa Fe, New Mexico 87507
*505 424-1112*
_www.positiveenergysolar.com_ <http://www.positiveenergysolar.com/>
*
*
On 5/31/2013 11:14 AM, Bob-O Schultze wrote:
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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