DC pump directly to PV Panel?

Posted by Tom Mayrand on June 02, 2008, 12:06:31 PM

Re: DC pump directly to PV Panel? (Reply #5)
James, you can just add a cheap relay in conjunction with the AC diff. controllers you sell. Basically use the AC output to the pump as the switching power for the relay that the 12 Volt load is attached to, or attach it to a transformer. (120V AC - 12 V DC). Though you have to plug the controller into an AC socket first.
« Last Edit: June 03, 2008, 08:19:46 AM by Tom Mayrand »
 

Posted by Paul Rohrs on June 09, 2008, 01:00:54 PM

Re: DC pump directly to PV Panel? (Reply #6)
This is a small working display that illustrates the functions of a PV Panel, Small DC circulators, and mini-solar collector.  The unit is now operational.

I am a hydronic heating contractor.  Here is a link to our Hydronic forum where I have a picture posted.


http://forums.invision.net/Thread.cfm?CFApp=2&Thread_ID=56882&mc=11

Thanks,

Paul

 

Posted by Tom Mayrand on June 12, 2008, 11:46:38 AM

Re: DC pump directly to PV Panel? (Reply #7)
Paul, the only problem I see with the display is the location of the pump. You may have to lower it to a location that is below the water level of the tank you propose to use. (I assume it is to be on the ground under the apparatus). Since it is an open system, it may not be able to prime itself from that height.
 

Posted by Paul Rohrs on June 16, 2008, 10:35:06 PM

Re: DC pump directly to PV Panel? (Reply #8)
Net positive suction head or NPSH was a concern of mine as well.  The basin is 3/4 full so the pump is primed without power.

Your thoughts are accurate though, had the water line of the basin been below the pump line, inability to prime and cavitation at the pump definately would have been an issue.

Paul

 

Posted by Tom Mayrand on June 17, 2008, 02:46:45 PM

Re: DC pump directly to PV Panel? (Reply #9)
Paul, just looked at your new setup. Looks good and looks like you found a good solution to keep the pump primed. Only thing is, (Though I know it is just for display and demonstration), you would be using recycled water from the shower drain. Perhaps you could install a holding tank above the SHW panel and either hook up a hose to the tank inlet or just use a gravity feed. This would eliminate the need for electricity. The higher the tank the more pressure you would get. Or perhaps you can install a small filter on the return to reuse the recycled water.
 
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