PV Environmental Payback Analysis [RE-wrenches]

[Dean T. Newberry]

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Hi Todd,
I found an analysis using Odum's Emergy accounting principles at:  
http://dieoff.com/pv.htm
There are other links at dieoff.com which explain the accounting 
principles.

I probably don't understand the principles very well, but I note that 
the units
in columns 4 and 5 are per year, but most of the inputs are one time 
costs, only
operations and maintenance are recurring costs. My interpretation of
that analysis which leads to an Emergy yield ratio at .48 per year 
discounted by
the O&M costs at 31% of annual Electrical Power Output leads me
to understand that the Emergy payback period would be 3.2 years. This is
consistent with the incorporated energy payback period reported by 
Evergreen
Solar for their modules.

I would really appreciate it if someone can report on that analysis who 
has a
better understanding of the Emergy accounting principles than I do.

Thanks y'All

cul  deant


Todd Cory, Mt. Shasta Energy Services wrote:

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>This is debatable. Odum never considers the life span of a panel, which is as of
>yet unknown as they keep going and going and going.
>
>Todd
>
>
>"Tom Lane, Energy Conservation Services" wrote:
>
>  
>
>> Sorry the truth is there has never been a net energy gain ever in the total
>>embedded energy of manufacturing  a pv module .There never has  been
>>manufactured a  pv module  that will result in a net energy gain   compared
>>to he energy embedded in mining glass aluminum etc --- please review the
>>work of  HowardOdum --- COST RECOVERY in utility savings does equal
>>recovering the embedded cost  from mining to installed module  gator tom
>>    
>>
>
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-- 
Dean T. Newberry
Marketing and Sales

Quantum Energy Group
265 Applegate School Road, P.O. Box 158
Applegate, Ca. 95703

Email:  deant at dcn.org

Cell:      530 867-2392
Office:  530-878-4585
Fax:      530-878-6685 

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