low voltage pump [RE-wrenches]

Allan Sindelar allan at positiveenergysolar.com
Wed Oct 8 15:48:51 PDT 2003


Kurt,
I am walking a fine line here by replying on-list, because we make the SETH
hydronic controller. I can post to this list as a Wrench, not as a
manufacturer's representative. But your question is of benefit to many, so
let me be short and to the point.

The 10HEH is bigger than you need for most single-zone applications. We use
it for PV-direct solar thermal applications. Don't try weird voltages unless
you want to be the only person in the state who knows how the system works.
And while it's fairly easy to make a 24-18 PWM converter (I'd recommend BZ
Products, as we have worked with them on a bulletproof 48-24V unit. Multiple
motor loads bring ripple that can overload a standard unit.), I would avoid
any more complexity than you need. If an 18V solution fails, you freeze
until a replacement is shipped in and you make a second trip back to change
it out.

Check out http://www.positiveenergysolar.com/hydronic.html. The top photo is
my home system, also 24V, with 5 zones now and a sixth for a hot tub
someday. I used a March 809BR24 for the primary loop, 24V Ivan solid state
zone pumps, and a SETH Stout to control it all. Works beautifully.

Hope this helps.

Allan at Positive Energy

----- Original Message ----- 
From: "sunwise" <sunwise at cheqnet.net
>
> I have three systems going into new homes that are built with in-slab
> heating systems.  In systems I have done that have solar going into the
> slab I have used Hartel HEH10 pumps very successfully.  My question is
> how to pump fluid directly off a 24 VDC battery, with one pump per zone?
>
> Operating a Hartel pump at 12 VDC by tapping off half the battery and
> using a battery balancer tends to run the pump too slow (it likes
> something closer to 20 volts).
>
> Is there a 24 VDC circulating pump that is as efficient and long lived
> as the Hartel?
>
> Is there a battery balancer that would allow one to tap three of the
> four six volt batteries in these systems (18 volts)?
>
> Would there be a voltage regulator or DC/DC voltage converter that could
> provide 18 to 20 volts at somewhere around 1.5 amps per pump from the 24
> volt battery?
>
> Any thoughts greatly appreciated -- Kurt Nelson
>
>

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