el sid question [RE-wrenches]

Mon May 16 10:34:18 PDT 2005

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Jay,

Yes, 2 20 watt modules would work fine. I think the pumps are OK with 
most standard voltage modules, but maybe opening and closing the circuit 
during the day is not a good idea. 

I think that putting the two pumps in series woudl be the most 
effective. It's possible that you could put them in parallel and not get 
any more flow than a single one.

I would NEVER use plastic pipe in a SDHW loop. NEVER! And that includes 
CPVC. Especially with Glycol.

Brad
jay peltz wrote:
> 
> Hi Brad thanks,
> 
> What about using 2 x 20 watt panels instead of 1 x 40 watt?
> 
> And I'm guessing that the 20v is a hard limit.  That could be a  
> problem on some cold winter morniings here?
> 
> Are the smaller units more resistant to this?
> I hook the smaller units in series or parallel?
> 
> My system (yet to be completed) will have 4 3x7' glass/copper  
> collectors on it.  They will be below the tank and be around oh  
> around 50' of piping away.
> 
> I'm going to use 3/4" pipe , combination of CPVC, and copper pipe.
> 
>    I've sized this system to produce much energy in the winter months.
> 
> I'm still working on a automatic covering system that will shade the  
> panels when the tank gets hot enough.
> 
> thanks,
> 
> jay
> 
> 
> On May 15, 2005, at 8:07 PM, bbassett at rockisland.com wrote:
> 
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> >
> > Jay,
> >
> > I have an El Sid 20PV pump in my SDHW system. Keep in mind that it  
> > takes
> > 1.1 amps to get it started. I'm using a 30watt module so it takes  
> > about
> > 1/2 sun to start it. When we have partly hazy days sometimes it  
> > doesn't
> > start when I could be collecting a goodly amount of heat. Then when it
> > does start I get a really hot slug of fluid through the system. I  
> > don't
> > think this is conducive to long glycol life. It keeps running until
> > pretty low light once it gets going. It pumps fine at over 2gpm  
> > through
> > a single 4x10 collector and low restriction heat exchanger (coil in
> > tank) with about 35% glycol. Dan did let me try out a circuit board he
> > made to help with the startup, and it worked fine while it worked, but
> > didn't work very long, and the electronics were exposed to being  
> > touched
> > and possibly easily damaged, so was not really a solution yet.
> >
> > So if you really wanted to use one I would couple it to a 40 watt  
> > module
> > or greater, making sure that it won't ever go over the 20 volt  
> > limit for
> > the pump. Good luck finding a 40 watt module, much less one with lower
> > voltage! Maybe the fountain pump module AEE has would be a good match,
> > hi amperage, low voltage 28 watt, although I prefer glass framed  
> > modules
> > for long life to match the heating collectors. I've had good luck with
> > the smaller ElSid pumps, both PV and battery versions. I would  
> > consider
> > using two of the ElSid-10PV pump, even if it is expensive, and a  
> > 30watt
> > module. My experience with two Hartell pumps on one module is that it
> > works very well. There's plenty of amps that starts one pump and then
> > the other one starts immediately after, so you might get good low sun
> > performance. I haven't tried this with two ElSid pumps, but give Dan a
> > call and ask him what he thinks.
> >
> > I tried one of the new Laing DC pumps last year, and found that it
> > didn't start on PV at all. It also made the most hideous wailing noise
> > I've ever heard while sitting there doing nothing. I've heard that  
> > they
> > work with an LCB, but don't know how well. They also didn't seem to  
> > have
> > a clue about what is required for a PV direct pump (or much of  
> > anything
> > else), even though they advertise that these pumps can be used that  
> > way.
> >
> > I just R&R a collector, for reroofing, that I installed about 15 years
> > ago that had an early version of the brushless Hartell pump (before  
> > the
> > little pancake motor was used). The system had an old Solarex 10 watt
> > module that tested OK still. It started with about 20% sun or less,  
> > just
> > barely turning over, but the warm fluid did come down the pipe! And  
> > with
> > good sun ran very nicely. It was quiet too. I wish I could get these
> > again.
> >
> > Actually my favorite was an old tiny Laing pump (very efficient)  
> > that I
> > coupled to a 10 watt de-bladed brushless DC fan. It worked great,  
> > but my
> > epoxied together shaft didn't last very long. So this is not a hard  
> > nut
> > to crack, someone just needs to do it right.
> >
> > Brad
> >
> >
> > jay peltz wrote:
> >
> >>
> >> I am planning on using a el sid 20 watt version on a glycol 4 panel
> >> system, off grid, array direct.
> >>
> >> Anybody know of any problems with this unit?
> >>
> >> thanks,
> >>
> >> jay
> >>
> >> peltz power
> >>
> >>
> >>
> >
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