12 volt differential controller [RE-wrenches]

Mon Oct 20 18:20:50 PDT 2003

If there are two 4x10's or two or three 4x8's I suggest the March 809 12 VDC
pump with a 20 watt module, hopefully, 15 to 16 volts, but no more than 25
watts. Use 30 to 40 watt modules 17 to 19 volts with Ivan Labs EL SID PV 20.
----- Original Message ----- 
From: "Darryl Thayer" <daryl_solar at yahoo.com>
To: <RE-wrenches at topica.com>
Sent: Saturday, October 18, 2003 8:44 AM
Subject: Re: 12 volt differential controller [RE-wrenches]


> 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
> > > >
> > > >
> > > > __________________________________
> > > > Do you Yahoo!?
> > > > The New Yahoo! Shopping - with improved product
> > > > search
> > > > http://shopping.yahoo.com
> > > >
> > > > - - - -
> > > > To send a message: RE-wrenches at topica.com
> > > >
> > > > Archive of previous messages:
> > > > http://www.topica.com/lists/RE-wrenches/
> > > >
> > > > List rules & etiquette:
> > > > http://www.mrsharkey.com/wrenches/etiquete.htm
> > > >
> > > > Check out participant bios:
> > > > www.mrsharkey.com/wrenches/index.html
> > > >
> > > > Hosted by Home Power magazine
> > > >
> > > > Moderator: michael.welch at homepower.com
> > > >
> > > >
> > >
> > >
> > > __________________________________
> > > Do you Yahoo!?
> > > The New Yahoo! Shopping - with improved product
> > search
> > > http://shopping.yahoo.com
> > >
> > > - - - -
> > > To send a message: RE-wrenches at topica.com
> > >
> > > Archive of previous messages:
> > http://www.topica.com/lists/RE-wrenches/
> > >
> > > List rules & etiquette:
> > http://www.mrsharkey.com/wrenches/etiquete.htm
> > >
> > > Check out participant bios:
> > www.mrsharkey.com/wrenches/index.html
> > >
> > > Hosted by Home Power magazine
> > >
> > > Moderator: michael.welch at homepower.com
> > >
> > >
> > >
> >
> > - - - -
> > To send a message: RE-wrenches at topica.com
> >
> > Archive of previous messages:
> > http://www.topica.com/lists/RE-wrenches/
> >
> > List rules & etiquette:
> > http://www.mrsharkey.com/wrenches/etiquete.htm
> >
> > Check out participant bios:
> > www.mrsharkey.com/wrenches/index.html
> >
> > Hosted by Home Power magazine
> >
> > Moderator: michael.welch at homepower.com
> >
> >
> >
> >
>
>
> __________________________________
> Do you Yahoo!?
> The New Yahoo! Shopping - with improved product search
> http://shopping.yahoo.com
>
> - - - -
> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
> List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
> Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
> Hosted by Home Power magazine
>
> Moderator: michael.welch at homepower.com
>
>
>

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at homepower.com

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

TOPICA - Start your own email discussion group. FREE!
http://www.topica.com/partner/tag02/create/index2.html
--^----------------------------------------------------------------