cost per kWh [RE-wrenches]

[matthew tritt]

Daryl,

Your study seems to follow the manufacturer's warranty limits virtually to
the letter. At 1% efficiency loss per year, we can expect our 1kW systems
installed in 2000 to be 800 Watt systems in 2020 minus another 6% for
inverter conversion losses. So, 750 Watts output (assuming of course you're
still getting that 1000 Watts per M/sq) and assuming the inverter company is
still in business and able to supply repaired units, the actual costs per
kWh will probably not be able to keep up with utility pricing escalation.

If the 1% loss per year continues at a linear pace (we can only hope it
won't), it's reasonable to expect a 30 year system life for PV, just in time
for a new roof!

Matt T
----- Original Message ----- 
From: "Daryl Thayer" <daryl_solar at yahoo.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, May 29, 2003 6:43 AM
Subject: RE: cost per kWh [RE-wrenches]


> I did a study on a almost 10 year old system with
> three 5kW inverters and 1990 era solar modules, the
> inverters are still functioning, the panels had lost
> about 1% per year in performance (power on the AC
> grid). (The reason was not investigated, perhaps they
> are building up a dirt layer.) The modules were of the
> multi-crystalline type. (old Mobile Oil technology)
> The system is still functioning without cost, never
> even cleaned, however the monitoring system is not.
> Daryl
>
>
> --- EH Roy <ehroy at solar-works.com> wrote:
> >
> > Matt,
> >
> > Maintenance costs and equipment replacement costs,
> > for starters. Not many
> > inverters are going to last 30 years.
> >
> > E. H. Roy
> > Solar Works Inc.
> > 64 Main Street
> > Montpelier, VT 05602
> > 802 223-7804 x306
> > ehroy at solar-works.com
> >
> >
> > -----Original Message-----
> > From: matthew tritt [mailto:solarone at charter.net]
> > Sent: Wednesday, May 28, 2003 7:57 PM
> > To: RE-wrenches at topica.com
> > Subject: Re: cost per kWh [RE-wrenches]
> >
> >
> > Jeff,
> >
> > But, if I understand the Ca. incentives correctly,
> > the maximum the program
> > allows with direct refunds and State income tax
> > breaks (except accelerated
> > depreciation) is 50% of the installed cost. 50% of
> > $00.17 is $00.085, right?
> > What am I missing?
> >
> > Matt T.
> > ----- Original Message -----
> > From: "Jeff Oldham" <starpower4u at juno.com>
> > To: <RE-wrenches at topica.com>
> > Sent: Wednesday, May 28, 2003 11:34 AM
> > Subject: Re: cost per kWh [RE-wrenches]
> >
> >
> > >
> > > This is a simple approach but it gives a pretty
> > good idea. Based on
> > $7,000/kW installed, a 1kW system will see about .72
> > kW at the AC bus x 5hr.
> > Iso x 365 (days/yr.)x 30 (industry standard for PV
> > life and conservative) =
> > 39,420 kWh. 7,000/39,420 = $0.1775/kWh over 30 yr.
> > life. This is w/o
> > incentives. You can plug in your incentives and
> > install costs and get there.
> > Here in CA for a business paying PG&E around
> > $0.18/kWh I can deliver
> > installed PV power AFTER all incentives State and
> > FED. at $0.04/kWh over 30
> > yr. in most cases with typical install logistics.
> > >
> > > -jeff o
> > >
> > > >From the Solar, Wind and Hydro powered office of
> > Jeff Oldham
> > >
> > >
> >
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