12 volt differential controller [RE-wrenches]

[Darryl Thayer]

Is not a differencial controller a comparator with
hysterisis?  A Schmitt trigger?  That is a simple
circuit to build, have you thought of building your
own? 
Daryl

--- "Carl Emerson, Free Power Ltd."
<freepower at freepower.co.nz> wrote:
> Kurt,
> 
> I would like to swap to this approach but I suspect
> that it would take 
> some time to optimize the threshold or insolation
> level that the pump 
> comes on at.... or do you not bother.
> 
> Also the pump will continue to run when the water is
> fully up to 
> temperature unless there is a thermostat control as
> well.
> 
> Maybe a combination of the two is needed and would
> be more efficient.
> 
> Carl Emerson
> Free Power Ltd.
> Auckland. NZ
> 
> sunwise wrote:
> 
> >Greetings Mark,
> >
> >I'm not going to be much help regarding the 12 volt
> controller but I
> >will mention a trend I see in the industry that
> does away with
> >differential controllers completely.  Instead of
> using such a
> >controller, a small (20 watt) solar panel is wired
> directly to a 12 volt
> >circulating pump (typically a Hartel HEH10).  When
> the sun is shinning
> >on the flat-plate collectors it is also on the pump
> panel, etc.  These
> >systems work great, especially in off-grid homes.
> >
> >Kurt Nelson
> >  
> >
> 
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> 


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