OutBack AUX output with March Pump [RE-wrenches]

[Kirk Herander, VSE]

I like the diode w/inverter control relay idea to limit circulator voltage,
as I'm about to use the March 809HS DC pumps in an off-grid radiant system.
But I've decided to use a dc-dc converter with a regulated 26.0 vdc output.
I don't want an inverter failure / repair send-away to knock down the
radiant heat system(this is an existing SW4024). I would rather have DC
voltage regulation independent of the inverter(either converter or external
voltage controlled relay w/ diodes). Otherwise, it sort of defeats the
purpose of using DC circulators, doesn't it?

Kirk

Vermont Solar Engineering
North American Board of Certified Energy Practitioners
Certified Solar PV Installer TM
Xantrex Certified Dealer Charter Member
Kirk Herander
PO Box 697
Burlington, VT. 05402
www.vermontsolar.com
www.backeastsolar.com
800.286.1252 - 802.863.1202
fax 802.863.7908

----- Original Message -----
From: "Christopher Freitas --- OutBack Power" <cfreitas at outbackpower.com>
To: <RE-wrenches at topica.com>
Sent: Tuesday, February 10, 2004 9:11 AM
Subject: OutBack AUX output with March Pump [RE-wrenches]


>
> sunwise wrote:
> >Using a double throw relay, how about having the pumps run battery
> >direct when below something like 27.6, and than at 27.7 the fan comes on
> >along with the relay coil which then has the diodes in series to the
> >pumps?  This way we wouldn't be running the pumps at even lower voltages
> >than the then low winter/nite time voltages our systems sometimes see in
> >Nov and Dec.
>
> Excellent idea - simple but effective.  We have been finding lots of
> ways to have the AUX output on the inverters do "double duty" for
> situations like this...
>
> Christopher Freitas
> OutBack Power Systems, Inc.
> cfreitas @ outbackpower.com
> www.outbackpower.com
> Arlington WA USA
> Tel 360 435 6030
>

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