Thermal - PV and diff controller? [RE-wrenches]

[bbassett at rockisland.com]

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Conrad,

The Tekmar 155 is specified to require 24v AC for power. I've never 
found anyone there who can tell me if it will run on 24v DC. Do you know 
if it will?

Thanks,
Brad 
AEE Solar


Conrad Geyser wrote:
> 
> Hey Ian, Kurt, Todd, Geoff et all,
> 
> Nice to hear those solar thermal topics.
> That Art-tec controller is a lot less $ than a Tek-Mar!  The Tek-Mar is
> really nice for versatility though.
> 
> In my testing of solar thermosiphon HX, I found that the temperature
> differential needed to drive the domestic side of the HX was adding 
> another
> 30 degrees to the soar loop temperature and lowering the efficiency.
> Anybody else?
> 
> cheers,
> Conrad Geyser
> Cotuit Solar
> 
> >
> >
> > Related topics:
> >
> > We just installed a March pump in a PV-direct SDHW system here, and
> > it's quite noisy (inside house in an open loft with the tank). I'm
> > going to try an El-Sid pump instead. Any feedback on noise? Choice of
> > pumps? Noise suppression?
> >
> > I'm just about to test a new DC control for PV-direct systems. See
> > http://www.arttec.net/dtc/. This should improve system efficiency by
> > avoiding pumping when the collector is colder than the tank.
> >
> > Best,
> >
> > Ian
> >
> > -- 
> >
> > Ian Woofenden <ian.woofenden at homepower.com>, Senior Editor
> > Home Power magazine; Subscriptions: $22.50 per year, PO Box 520,
> > Ashland, OR 97520 USA
> > 800-707-6585 (US), 541-512-0220, or download free sample issue at
> > <http://www.homepower.com>
> >
> >
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> 


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