[RE-wrenches] Reliable 48 to 24 V DC to DC reducer

[Ray]

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.

Ray Walters
Remote Solar
303 505-8760

On 9/17/18 8:16 AM, Drake wrote:
> Ray,
>
> The pumps you recommend seem like very solid units. Have you had 
> problems with the El Sid pumps?
>
> My concerns are that the TACO and Grundfos 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?
>
> Thanks,
>
> Drake
>
> At 02:53 PM 9/15/2018, you wrote:
>> Content-Type: multipart/alternative;
>> Â boundary="------------E0BC4714B0DAF20D8F5FC6FF"
>> Content-Language: en-US
>>
>> SCI was that Canadian company.  Samlex does make a 48 v to 24 v 
>> converter model IDC-100C-24.
>>
>> However, I would consider skipping the El cid pumps and going to the 
>> new TACO or Grundfos ECM drive circulators.
>>
>> Ray Walters
>> Remote Solar
>> 303 505-8760
>> On 9/15/18 8:58 AM, Drake wrote:
>>> 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.
>>>
>>> I need to step down power from a 48 V battery bank to power El Sid 
>>> pumps for an offgrid hydronic  heating system.
>>>
>>> Thanks,
>>>
>>> Drake
>>>
>>> Drake Chamberlin
>>> /Athens Electric LLC
>>> OH License 44810
>>> CO License 3773
>>> NABCEP Certified Solar PV
>>> 740-448-7328
>>> /http://athens-electric.com/
>>>
>>>
>>>
>>>
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