Posted by *Joesepi* on September 5, 2009, 2:47 am

It would be interesting to hear what the actual losses are, financially,

after a few years of running a large installation like these.

*> posted this before*

*> but here is the largest private one in Wisc*

*> http://www.dlwhite.net/projects/solarbarn/ *

Posted by *BobG* on September 5, 2009, 3:02 am

*> It would be interesting to hear what the actual losses are, financially,*

*> after a few years of running a large installation like these.*

==========================

=====================

Pure guesstimate: 11kw system at about $/watt, looks like about a

$0K system. If juice cost $.15/kw up there, and he generates about

40kw a day, or $ or so, it will take about 32 years to get into the

black. Longer if juce is cheaper or system costs more. Seems like a

looong time. Not so long compared to the age of the barn though.

Posted by *philo* on September 5, 2009, 5:39 am

BobG wrote:

*>> It would be interesting to hear what the actual losses are, financially,*

*>> after a few years of running a large installation like these.*

*> ==============================================*

*> Pure guesstimate: 11kw system at about $/watt, looks like about a*

*> $0K system. If juice cost $.15/kw up there, and he generates about*

*> 40kw a day, or $ or so, it will take about 32 years to get into the*

*> black. Longer if juce is cheaper or system costs more. Seems like a*

*> looong time. Not so long compared to the age of the barn though.*

Though I did a "quick calc" once and came up with 20 years or so...

he claims 15 (which I honestly think is over-optimistic)

However my question is: how long will the solar panels last?

Posted by *Joesepi* on September 5, 2009, 4:17 pm

$0K (initial outlay only) x 5% per annum financial investment losses / 365

days = $.58 per day in lost investment interest or loan interest.

He could never break even at those grid rates and we haven't considered any

maintenance costs or the financial market making a comback.

I hope he didn't mortgage a house or cash a pension for this expensive

hobby.

*> It would be interesting to hear what the actual losses are, financially,*

*> after a few years of running a large installation like these.*

==============================================

Pure guesstimate: 11kw system at about $/watt, looks like about a

$0K system. If juice cost $.15/kw up there, and he generates about

40kw a day, or $ or so, it will take about 32 years to get into the

black. Longer if juce is cheaper or system costs more. Seems like a

looong time. Not so long compared to the age of the barn though.

Posted by *AES* on September 5, 2009, 4:41 pm

*> Pure guesstimate: 11kw system at about $/watt, looks like about a*

*> $0K system. If juice cost $.15/kw up there, and he generates about*

*> 40kw a day, or $ or so, it will take about 32 years to get into the*

*> black. Longer if juce is cheaper or system costs more. Seems like a*

*> looong time. Not so long compared to the age of the barn though. *

---------------

*> $0K (initial outlay only) x 5% per annum financial investment losses / 365 *

*> days = $.58 per day in lost investment interest or loan interest.*

*> *

*> He could never break even at those grid rates and we haven't considered any *

*> maintenance costs or the financial market making a comback.*

*> *

*> I hope he didn't mortgage a house or cash a pension for this expensive *

*> hobby.*

----------------

Additional factors that need to be considered in these kinds of

calculations -- especially for residences that actually use the solar

generated power to substitute for utility grid power, rather than

selling a lot of it:

1) In many areas residential rates are steeply tiered: start at 10+

cents/kwh, rapidly jump to 20+ cents, then 35 cents.

2) And are likely to increase (sharply?) in future years.

3) And are paid with after-tax homeowner dollars, whereas that "lost

investment interest or loan interest" would likely have been taxable

income, one way or another.

4) And, there's a reasonable chance that some fraction of the initial

investment will be recovered on eventual resale of the residence. (No

guarantee of this, of course -- but my guess is there's a good chance of

this.)

> posted this before> but here is the largest private one in Wisc> http://www.dlwhite.net/projects/solarbarn/