Dave, I used to use El Sids a lot in SHW systems with direct PV drive for the glycol circulation. I've long stopped installing SHW, but have used them in off grid hydronic heat systems as well. The electronics have failed on many of these pumps over the years. They seem particularly intolerant of higher voltages, even small ones, which if they are being driven off battery voltage, is hard to avoid. None-the-less while I really liked the El Sids, they were too expensive to have as many failures as they did. I'm familiar with March pumps as well, but they always seem to fail prematurely as well, for even more money. I was hoping there might be a suitable replacement for a somewhat less expensive alternative. Howie
*Howie Michaelson**Sun Catcher* *NABCEP Certified Solar PV Installer™* *Solar Electric Systems Sales & Service802-272-0004* On Tue, Sep 15, 2020 at 10:29 AM Dave Angelini Offgrid Solar < offgridso...@sti.net> wrote: > Why did the El Sid fail? The one way I have seen them fail, and any pump > for that matter is rain water that has (for some reason) lower than a > normal PH. Below from wiki. > > Normal, clean rain has a *pH* value of between 5.0 and 5.5, which is > slightly acidic. However, when rain combines with sulfur dioxide or > nitrogen oxides—produced from power plants and automobiles—the rain becomes > much more acidic. Typical acid rain has a *pH* value of 4.0. > > > > *Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/> > e-mail offgridso...@sti.net <offgridso...@sti.net> > text 209 813 0060* > > On Mon, 14 Sep 2020 23:49:35 -0400, Howie Michaelson < > howie.michael...@gmail.com> wrote: > > Hi All, > I need to replace 3-5 El Sid pumps I'm using in a low volume hydronic > heating system. Other than laing pumps, are there any recommendations for > 12, 24, or 48 vDC pumps? Having magnetic drives that mate with the > impeller body of the El Sids, would be a bonus. > Thanks, > Howie > > *Howie Michaelson**Sun Catcher* > > *NABCEP Certified Solar PV Installer™* > > *Solar Electric Systems Sales & Service802-272-0004* > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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