low voltage pump [RE-wrenches]

[Greg Egan]

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Kurt,

You can get a dc/dc converter from solarconverters.com. You can get them 
set at the factory to regulate at a certain voltage. The last one I 
bought was a EQ 12/24-20 R13.5. I used it to output up to 20 amps from a 
24 volt batt bank, at 13.5 vdc.

Best,

Greg

sunwise wrote:
> Greetings all,
> 
> 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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