[RE-wrenches] Another pump quesiton

[Ray]

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 
>> <offgridsolar at sti.net <mailto:offgridsolar at 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/ e-mail offgridsolar at sti.net
>>     <mailto:offgridsolar at sti.net> text 209 813 0060*
>>
>>     On Mon, 14 Sep 2020 23:49:35 -0400, Howie Michaelson
>>     <Howie.Michaelson at gmail.com <mailto:Howie.Michaelson at 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 & Service
>>>     802-272-0004*
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> -- 
>
> *Allan Sindelar*
> allan at sindelarsolar.com <mailto:allan at sindelarsolar.com>
> NABCEP Certified PV Installation Professional
> New Mexico EE98J Journeyman Electrician
> Founder (Retired), Positive Energy, Inc.
> *505 780-2738 cell*
>
>
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