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

[Drake]

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;
 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
303 505-8760On 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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Re: [RE-wrenches] Reliable 48 to 24 V DC to DC reducer

[John Blittersdorf]

I went a more expensive route but never regretted it as I want a stable
power supply for my SunFrost and 12V DC Pumps.  I have an Iota AC to 12v DC
charger/power supply which works with or without batteries.  I have kept a
12V battery attached as it gives me 2nd level redundancy when my main bank
hits low battery cutoff the DC equipment starts with a full battery.
 My 48V Outback is on all the time anyway and the small AC to DC loss is
insignificant it my system and also when I monitor the outback system with
Optics, I see all my loads, including the 12V DC Loads as one measurement.
I have been using this system for about 10 years with no problems. Most of
the time the Iota is just coasting but if I need surge capacity, it can
handle  30 amps.  Also I left my 12V system in tack so I have some DC
lights and anything else I want to plug into 12v (ie, charging a car
battery, 12V laptop power cord) it is available.  My 2 L16 batteries on the
system are vurtually dead right now, probably no water in them, but the
surface charge works with the Iota and no negative affects.

On Sat, Sep 15, 2018 at 10:58 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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Re: [RE-wrenches] Reliable 48 to 24 V DC to DC reducer

[Drake]

There are certainly many options I didn't know 
about. You guys are an incredible resource!


On the LED drivers, do you bypass the transformer 
and rectifier and wire in directly to the DC leads inside the box?


Thanks,.

Drake



At 11:31 AM 9/15/2018, you wrote:
I have had great luck using cheap LED 
drivers.  They say 110-240 vac input but they 
rectify the input to DC.  I have used them to 
run 12 and 24 volt stuff off of 48 vdc and even 
400 vdc. They operate down to about 35 volts dc. 
They are available in a variety of output 
voltage and current. And they are isolated. 
  And they only cost a few dollars.Â

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F152134115704
David Katz

On Sat, Sep 15, 2018 at 7:58 AM Drake 
<drake.chamber...@redwoodalliance.org> 
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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Re: [RE-wrenches] Reliable 48 to 24 V DC to DC reducer

[Ray]

SCI was that Canadian company.  Samlex does make a 48 v to 24 v 
converter modelIDC-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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Re: [RE-wrenches] Reliable 48 to 24 V DC to DC reducer

[Sindelar Solar]

While not as inexpensive as David's solution, I have used Mean Well 
converters with success. This manufacturer supplied the DC-DC step-down 
converters used by Wattsun for their tracker drives, so there's a pretty 
long history with them. Check out 
https://www.trcelectronics.com/View/Mean-Well/RSD-200C-48.shtml.


Allan

On 9/15/2018 9:31 AM, David Katz wrote:
I have had great luck using cheap LED drivers. They say 110-240 vac 
input but they rectify the input to DC. I have used them to run 12 and 
24 volt stuff off of 48 vdc and even 400 vdc. They operate down to 
about 35 volts dc. They are available in a variety of output voltage 
and current. And they are isolated.   And they only cost a few dollars.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F152134115704
David Katz

On Sat, Sep 15, 2018 at 7:58 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. Samlex 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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--

*Allan Sindelar*
al...@sindelarsolar.com 
NABCEP Certified PV Installation Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*

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

[David Katz]

I have had great luck using cheap LED drivers.  They say 110-240 vac input
but they rectify the input to DC.  I have used them to run 12 and 24 volt
stuff off of 48 vdc and even 400 vdc. They operate down to about 35 volts
dc. They are available in a variety of output voltage and current. And they
are isolated.   And they only cost a few dollars.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F152134115704
David Katz

On Sat, Sep 15, 2018 at 7:58 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/
>
> ___
> List sponsored by Redwood Alliance
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> --
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[RE-wrenches] Reliable 48 to 24 V DC to DC reducer

[Drake]

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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