Back to the future with DC? [RE-wrenches]

[Joel Davidson]

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Hello Jay,

Amen. I understand Nextek's reason for promoting DC, but it seems like the 
new generation at EPRI is rehashing some of GE's 1979 study. Even that study 
concluded that self-sufficient stand-alone PV systems were less preferable 
than utility-connected PV systems. Off-grid DC PV served us well in the 
1970s and 1980s, but Heart/Trace changed the game. As you say, small DC PV 
(from calculators to cabin systems) makes sense as do larger DC systems for 
mobile applications (forklifts, cars, etc), but "big" stationary DC PV for 
other than remote comm systems has become as rare as Edison cells.

Joel Davidson

----- Original Message ----- 
From: "Jay Peltz, Peltz Power" <jay at asis.com>
To: <RE-wrenches at topica.com>
Sent: Tuesday, August 15, 2006 6:39 PM
Subject: Re: Back to the future with DC? [RE-wrenches]


>
> Hi Joel,
>
> I find it pretty hard to recommend going DC at all anymore,.
> Lights are few and expensive,
> DC plugs? then dual wire the house,
> AC fridges are as efficient as DC ones are
> DC appliances, poor choices, bad quality
>
> For small systems, then yes I do it often, but for larger systems,  its 
> just not happening.
>
> jay
>
> peltz power
>
> On Aug 15, 2006, at 6:09 PM, Joel Davidson wrote:
>
>>
>> See http://mydocs.epri.com/docs/CorporateDocuments/WhitePapers/ 
>> EPRI_DCpower_June2006.pdfA for an interesting Electric Power  Research 
>> Institute (EPRI) white paper "DC Power Production,  Delivery and 
>> Utilization." Charge your portable electronics with an  inductive 
>> charging pad. Use your hybrid Prius as an emergency home  generator. 
>> Operate your computer data center more efficiently? For  wrenches it's 
>> been there done that. Has anyone done a mostly DC  loads PV system in the 
>>  >2 kW array range lately or has Outback and  other off/on-grid inverters 
>> put larger DC residential systems to rest?
>>
>> Joel Davidson
>>
>>
>> -
>
>
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