DC-DC Conversion questions [RE-wrenches]

[Ezra Auerbach, DragonSun Consulting]

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Hi Allan,

Over ten years ago I changed my home's basic voltage from 12 Vdc to 24 Vdc
to accomodate bigger inverter - an early SW Series I believe.  I installed
a Vanner battery equalizer for the eixisting 12 Volt loads in our home. 
The loads were all pretty simple ones, Sunfrost, lights, entertainment
system.  I've since changed most of the low voltage circuits over to 120
Vac but still maintain a few  DC fixtures and plugs in the nome.  The
Vanner has worked flawlessley with nary a glitch  (well...sometimes the
Vanner will have some effect of TV reception or CFL balast noise).

New Years wishes to all.

Ezra Auerbach

----- Original Message -----
From: Allan Sindelar <allan at positiveenergysolar.com>
Sent: Thursday, December 23, 2004 12:01:41 PM
To: New wrenches posting <RE-wrenches at topica.com>
Subject: DC-DC Conversion questions [RE-wrenches]

>  
> 
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> 
> Wrenches,
> I know that this will come up more and more, and I haven't seen addressed
> here yet. From time to time we are asked to do major system upgrades on
> older off-grid systems. In many cases the best upgrade solutions involve
> raising the nominal system voltage, especially when we are replacing an
> inverter with a modern sine-wave model. This is especially true with old
12V
> systems, but now I even see cases where jumping from 24 to 48V would be
> desireable, such as the recent job I posted about (re adding input
breakers
> to a PSC500) where the client wants 4kW of array on an existing 24V
system.
> 
> How successful have you been running existing motor and compressor loads
> through DC-DC stepdown converters? I am specificially asking about DC Sun
> Frost fridges, and 12 and 24-volt Shurflo 2088 and 9300, and Flowlight
> Booster pumps. I'm asking for real-world, "yeah I did it 48-24 and it's
> worked well for two years" feedback, please. Any failures, notable
> efficiency losses, weird glitches? What brand converter: BZ, Solar
> Converters, Zane, others?
> 
> Thank you.
> Allan at PosE
> 
> Your free subscription is supported by today's sponsor:
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> ** Get Your Own Support-a-Cure Yellow Bracelet for $1.99 **   
> Show your support for finding cures for both AIDS & Cancer. 
> Get yours for just $1.99. This bracelet makes a difference.
> http://click.topica.com/caacVlObz8QcsbAlphCf/Penn Media
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