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<p>As many other folks have noted, the El Cid pumps are very low
flow rate, so it can be very hard to get air out of the system.
These air pockets can build up and keep the fluid from flowing at
all in some loops. No flow, no heat. Besides being half the
power draw , the ECM pumps are variable speed so their power draw
can be reduced even further. At initial start up they can be run
at full power (roughly 40 watts) and then once the air is purged
from the system, they can be throttled back to even lower power
draw. I have not heard of either company doing anything DC. I've
found that when involving the other trades (plumbers, house
electricians, well service, etc) that the closer it is to being
how they normally do it, the better. Using these ECM drive pumps
for instance, is just a matter of specing the pump. It plumbs and
wires in just like a regular model.<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 9/17/18 8:16 AM, Drake wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20180917141657.AAD22105A82@pdx1-mailman03.dreamhost.com">
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Ray,<br>
<br>
The pumps you recommend seem like very solid units. Have you had
problems
with the El Sid pumps?<br>
<br>
My concerns are that the TACO and
<font face="Helvetica, Helvetica">Grundfos </font>pumps I've
found are
over 80 W each, running on AC. If the El Sid are reliable, I'd
prefer to
stay with the low power usage and DC. Do either of these companies
make
any low wattage DC pumps?<br>
<br>
Thanks,<br>
<br>
Drake <br>
<br>
At 02:53 PM 9/15/2018, you wrote:<br>
<blockquote type="cite" class="cite" cite="">Content-Type:
multipart/alternative;<br>
boundary="------------E0BC4714B0DAF20D8F5FC6FF"<br>
Content-Language: en-US<br>
<br>
SCI was that Canadian company. Samlex does make a 48 v to 24 v
converter model IDC-100C-24.<br>
<br>
<font face="Helvetica, Helvetica">However, I would consider
skipping the
El cid pumps and going to the new TACO or Grundfos ECM drive
circulators.</font><br>
<br>
<pre>Ray Walters
Remote Solar
303 505-8760</pre>
On 9/15/18
8:58 AM, Drake wrote:<br>
<blockquote type="cite" class="cite" cite="">Since Solar
Converters seems to
have evaporated, I'm not sure where to look for a 48 to 24 V
DC to DC
converter. Samplex has 24 to 12. It seems like someone
mentioned a
Canadian company that makes these. <br>
<br>
I need to step down power from a 48 V battery bank to power El
Sid pumps
for an offgrid <font size="2">hydronic</font> heating
system.
<br>
<br>
Thanks,<br>
<br>
Drake <br>
<br>
<a name="_MailAutoSig" moz-do-not-send="true"></a>Drake
Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
740-448-7328<br>
</i><a href="http://athens-electric.com/"
moz-do-not-send="true">http://athens-electric.com/</a>
<br>
<br>
<br>
<br>
<br>
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