12 volt differential controller [RE-wrenches]

[Darryl Thayer]

Tom
The collectors are to be Heliodyne, Gobi collectors,
either 4x8 or 4x10 The roof has room for 6 wide, but I
will use only 4 or 5.  The waste heat will be used in
the outdoor hot tub.  Or dumped into the ground source
heat pump loop.  
Daryl  

--- "Tom Lane, Energy Conservation Services"
<solar8 at ehostingbiz.com> wrote:
> TELL ME WHOSE SOLAR THERMAL COLLECTORS YOU ARE USING
> the total area and I
> will list the parameters for the voltage and
> amperage required for two
> different D.C. pumps  gator tom
> ----- Original Message ----- 
> From: "Darryl Thayer" <daryl_solar at yahoo.com>
> To: <RE-wrenches at topica.com>
> Sent: Saturday, October 18, 2003 1:00 AM
> Subject: Re: 12 volt differential controller
> [RE-wrenches]
> 
> 
> > Hi Mark
> > What is the pump and what size and type pump do
> you
> > use?  How big is the SDHW, and what type.  I ask
> just
> > for myself and other wrenches that normally do
> just
> > 110 volt AC DHW.  I have a customer that wants
> both
> > DHW and PV installed, so I am thinking of doing
> 2kW PV
> > and to steal some DC for the SDHW.
> > Daryl
> >
> > --- "Mark Downing, Hurshtown Alt. Power"
> > <solarman4 at yahoo.com> wrote:
> > > 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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