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9,500 kWh of production in first year - Page 5

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Posted by Bob on May 6, 2008, 5:24 am
On May 5, 10:37 am, d...@02.usenet.us.com wrote:

5% would be great.  The meter on the inverter measures total output
from the photovoltaic system, not the net power produced by your
system, I think.  That's one reason they sell optional, bidirectional,
kWh meters.  There is some AC current going into your system (standby
tare loss) when there is no sunlight or when the inverter powers up in
the morning.  This reverse flow into your system adds up over the
year, kilowatts not watts, (but if the system stays within its specs,
it should not be too high, percentage wise).

Does anyone have a second, separate, utility grade meter to measure
the net output of their photovoltaic system, and how does that compare
to the reading from the inverter meter?

'my edit'

Posted by Kitep on May 4, 2008, 1:01 am

Pardon my interruption, but what do you mean by "runtime"?

Posted by dold on May 5, 2008, 5:33 pm
The hours that the Fronius reports that it was running that day.
Before official sunup, The Fronius seems to start at about 90 watts AC
output.  After sundown, it quits somewhere around 30 watts output.

Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

Posted by Bob on May 6, 2008, 3:55 am
 Hi Clarence, thanks for your reply.  A few questions:

On May 3, 2:48 pm, d...@02.usenet.us.com wrote:


Using your link, PVWATTS version1 for Sacramento (the closest city on
the PVWATTS v.1 map), 4.5 kW DC system (assuming they mean STC) and
using the defaults for the other inputs, I get the result AC energy
kWh 6297 per year.  What inputs did you use to get the result 6777?

I agree with the figure for the 20 year fixed.  But  $0,000 @ 6.250
*  7yr fixed equity = $95 a month.
What was the cost of your 4.5 kW system, before and after rebates?
Tax deductible interest would help, of course, but that is another
subsidy in addition to the already existing federal and state

Posted by dold on May 8, 2008, 9:33 pm
San Francisco has a higher projection than Sacramento.

That's the payment on a 7 yr equity. There would be a refi at 7 yrs.
That's the way the bank quotes it.  

$ 34529
PG&E -10593.27
The installer credited the PG&E rebate, so my payment was $3975.
There was a Federal Tax Credit of $000.  Out of pocket $1975.

Subsidies, especially tax deductions, are something you can chose to ignore
in your financial calculations or justifications, if you wish.  They are
part of my financial picture.  I don't get to ignore the cost of subsidies
that I pay.

Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

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