12 volt differential controller [RE-wrenches]

[Allan Sindelar]

Mark,
The Goldline GL-30 differential controller may be satisfactorily powered by
24V DC. To do so you must solder leads to the circuit board, or else tap two
unused pins (Pin 4, 4th from top is 24vdc+, and Pin 5, 5th from top is
24vdc-) on a terminal strip. It probably voids the warranty, but it works
fine. Then you could use a 12-24V step-up converter to supply power. It's
not the most elegant solution, but it will work.

E-mail me off-list if you'd like me to fax a diagram of the solder points.

Allan at +E

----- Original Message ----- 
From: "Mark Downing, Hurshtown Alt. Power" <solarman4 at yahoo.com>
To: <RE-wrenches at topica.com>
Sent: Monday, October 13, 2003 5:16 AM
Subject: Re: 12 volt differential controller [RE-wrenches]


> 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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