12 volt differential controller [RE-wrenches]

Mark Downing, Hurshtown Alt. Power solarman4 at yahoo.com
Mon Oct 13 04:16:21 PDT 2003


Yes I've thought of building my own, but not designing it.
I was given a tip that Ivan Labs makes the controller I need, and I am for
the time being going to see about getting one of these.

--- Darryl Thayer <daryl_solar at yahoo.com> wrote:
> 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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