Re: [RE-wrenches] pump questions

HI all All those 75 watt panels were really close to the same parameters. According to one catalog, it was: 4.4 imp, 4.8isc, 17 vmp, 21 voc From memory, they did poorly in hot weather, heavy voltage drop. jay peltz power On May 31, 2013, at 10:30 AM, Allan Sindelar wrote: > Bob-O and

Re: [RE-wrenches] pump questions

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: , then click on "Sizing," and "Renewable Energy Systems". You'll still need to enter module data, since their database only inc

Re: [RE-wrenches] pump questions

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

Re: [RE-wrenches] pump questions

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 fo

Re: [RE-wrenches] pump questions

The efficiency is higher at higher voltage. David Katz Sent from my iPhone On May 30, 2013, at 7:12 PM, "Jesse Dahl" mailto:dahlso...@gmail.com>> wrote: I was reading up on the SQF pump and do remember seeing something about efficiency at higher voltages. Can't remember if it got better or wo

Re: [RE-wrenches] pump questions

I was reading up on the SQF pump and do remember seeing something about efficiency at higher voltages. Can't remember if it got better or worse. Jesse Sent from my iPhone On May 30, 2013, at 6:44 PM, Allan Sindelar wrote: > Todd, > The SQF runs on 30V or more, but is happiest above 90V acc

Re: [RE-wrenches] pump questions

Todd, The SQF runs on 30V or more, but is happiest above 90V according to Grundfos, and I have never heard anything suggesting a disadvantage to the higher voltages. I think the 1400 watts is a theoretical maximum, and the pump will vary its operation

[RE-wrenches] pump questions

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.