I've always suspected that one of the issues was the variable voltage of
DC systems. Batteries get low, and the current increases quite a bit,
cold weather or EQing and the voltage can get really high and cause
problems. The total variation just seems to take out a fair bit of both
brushes and controls. This is just my long standing theory however, and
I don't have Lab results.
I actually had similar problems on 120 vac, when I lived on the edge of
the grid. Voltage varied from 90 to 145 vac, and cooked quite a few
things like washing machine controls (every 3 months or so) Once I put
in a backup power system to protect those circuits, the controls lasted
for a decade.
Ray Walters
Remote Solar
303 505-8760
On 9/15/20 10:29 PM, Sindelar Solar wrote:
This has been my experience as well, although I can't give such
specific rationale as to why the El Sids failed - the electronics just
usually and eventually fail in my battery-based hydronic system. The
Marches just eventually wear out.
Allan
On 9/15/2020 9:57 PM, Howie Michaelson wrote:
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 & Service
802-272-0004*
On Tue, Sep 15, 2020 at 10:29 AM Dave Angelini Offgrid Solar
<[email protected] <mailto:[email protected]>> 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/ e-mail [email protected]
<mailto:[email protected]> text 209 813 0060*
On Mon, 14 Sep 2020 23:49:35 -0400, Howie Michaelson
<[email protected] <mailto:[email protected]>>
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 & Service
802-272-0004*
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