Posted by Eeyore on November 29, 2008, 11:31 am
Assumes 5.3 hours per day equivalent peak insolation.
NY gets about 2.7 in winter, so if it's to work all year round multiply your
figures by 2.
Posted by Eeyore on November 29, 2008, 11:09 am
Why ? Are you off grid ? If not, don't waste your time and money.
Looks like you're in New York. Don't expect much useful insolation there !
Posted by Eeyore on November 29, 2008, 11:21 am
Use solar thermal for that and heat the water directly.
Have you ANY idea how many sq metres of panels, batteries, charge controllers
and inverters that would take ? And how much it would cost ?
A 1 sq metre panel would power it for about 1 hour in NY assuming no system
losses. And not at all on a cloudy day. You'd pay about $000 for that approx.
If by 'all day long' you mean say 12 hours multiply accordingly ($2,000).
If you care about energy use get a less thirsty computer. Low power CPUs and
chipsets are available in modern computers. Plus Linux won't need as powerful a
PC as Vista by a LONG way. And get an LCD screen. And insulate your home
Posted by Eeyore on November 29, 2008, 11:24 am
And WHERE on that page does it state how much power it will deliver ?
Probably reportable to the FTC for fraud.
And to think you write software ! I just hope it's not safety critical if you're
Posted by Eeyore on November 29, 2008, 11:41 am
Oh here !
"One Uni-Solar 32-watt amorphous-silicon PV module, 12 volts: $80.00
First, the 32-watt amorphous silicon PV module. I chose amorphous silicon, as
opposed to crystalline silicon, for its superior performance in low light
conditions, since youíll want to capture every ray of sunlight you can. Itís
nominally rated at 32 watts, but for reasons too complicated to explain here, the
most power youíll ever see it produce with a standard charge controller is
watts. This peak production will be for the two or three hours that straddle
when the sun is highest in the sky. Though output varies with the seasons, this
small module will produce between 0.15 and 0.20 kWh of power each sunny day;
considerably less during cloudy periods."
How much do you expect to run on 32W when you have 2.7 hours of insolation ?
That's less than 0.1 kWh !
"So, in a reasonably sunny climate, you should be able to count on about one kWh
energy per week, give or take. What can you do with that much-or that
ONE kWh of energy per WEEK ? Worth what ? maybe 20c ? So you get $0 worth of
electricity per year for an outlay of $00.
Even assuming your money earns no interest that would be a payback period of
But it's worse than that because after 60 years you will probably have had to
replace the batteries at least SIX times.
Two Deka 92 amp-hour sealed batteries, 12 volts: ($30.00 each) $60.00
That's another $560. In short it'll never pay for itself and its total
environmental impact will be WORSE than using grid electricity.
Oh and after 60 years that panel might be down to 2/3 output or worse too.
Unquestionably if they think you can power the stuff they mention on it.
This stuff is all 'green propaganda' TRASH.