[RE-wrenches] DC to DC converters

[Mike Kocsmiersky]

I've had good luck with both the SureSine from Morningstar and Exeltech for
inverters.  Couldn't tell you the noise output.

Also, you may want to try Solar Converters Inc, or Samlex for DC to DC
converters.

 

 

Mike Kocsmiersky

Principal

Phone: 413 883-3144 

Spirit Solar

www.SpiritSolar.net

 

 

From: Ray Walters [mailto:ray at solarray.com] 
Sent: Monday, March 28, 2016 6:47 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] DC to DC converters

 

What about building a 30 vdc system (5 x 6v batteries in series)  and adjust
the settings on a Midnite Classic to work with that?  How tight does the 30
vdc output need to be?

On inverters, I've had  trouble with the Suresine, basically not working
with GFCI outlets.
I keep trying different models of GFCIs, but they keep randomly tripping on
2 different systems. 
Morningstar's list of "approved" GFCIs doesn't list any currently
manufactured models, while calls to their tech support yields "Oh, that
shouldn't be a problem, it should work with all GFCIs..."
Way too many free trips out trying to fix this, so I may have to abandon
GFCI protection, or replace the inverters.  
My suggestion for that small load: Exeltech 125.  Better than grid waveform,
and I recently pulled one out of corroded outdoor enclosure almost 15 years
old: it looked terrible, but was still working fine.  It would also be lower
cost and fit in a smaller enclosure.



R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer, 
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 3/28/2016 2:24 PM, Dan Fink wrote:

Hi William; 

30VDC is kind of odd, but 36VDC is common. The folks at Solar Converters
might be able to fix you up with a custom one, or perhaps 36V is within the
sat unit's input range.

As for the inverter, I've never gone wrong with the Morningstar SureSine.
Slick little unit.




Dan Fink 

Adjunct Professor of Solar Energy Technology, Ecotech Institute

IREC Certified InstructorT for: 

~ PV Installation Professional

~ Small Wind Installer

Executive Director, Buckville Energy

NABCEP Registered Continuing Education ProvidersT
 <tel:970.672.4342> 970.672.4342


 

 

On Mon, Mar 28, 2016 at 1:44 PM, William Miller <william at millersolar.com>
wrote:

Friends:

 

I am designing a satellite data interface for a large off-grid system for a
state highway department facility.  We will be using the Outback Optics data
capabilities along with equipment manufactured by Control by Web.

 

I'd like to run the satellite system on a battery power source so I can hope
to use it when we need it most, when the power is down.  We have a separate
24 volt battery bank remaining from a previous generator control system.
The satellite system operates on 30 VDC at 2 amps.

 

My first choice is to find a DC to DC converter from nominal 24 volts.  Do
any of you know of one that you could recommend?

 

My second choice is to use a small inverter.  Can anyone suggest one at this
small wattage?  I don't know how good the power supply is at rejecting
waveform distortion so I presume an inverter needs to be somewhat close to a
sine wave.

Thanks in advance.

 

William Miller

 

 

Gradient Cap_mini
Lic 773985
millersolar.com <http://www.millersolar.com/> 
805-438-5600

 

 






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