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Plug in grid tie systems advice? - Page 2

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Posted by BobG on February 23, 2009, 2:23 am
On Feb 22, 8:12pm, m...@privacy.net wrote:

Seems nutty to have a 250 watt inverter and 45 watts of panels. Thats
why I mentioned getting a couple of 120 watt panels.

Posted by Mel on February 23, 2009, 10:17 am
me@privacy.net a crit :

Before you plug anything in, even a "beginner system" you really need to =

check out legal requirements for grid connection where you live. Most
places in the world it i illegal to use "plug and play" grid connected
pv systems, because you need to go through a heap of permitting stuff.

Posted by vaughn on February 23, 2009, 2:50 am

First: add up the cost of your proposed system.

Second: come up with a real-world idea of the power you might expect to
produce in a day.  (figure 80% of the advertised output of your panels,
times perhaps 10 hours per day of full sunlight, and then expect to net
something less than that.)

Finally:  Look on your power bill to find out what you pay for a Kwh, and
then do the math to figure out how long it will take your proposed little
system to pay itself.  Having done that, you will do what I did...leave the
money in the bank.


Posted by BobG on February 23, 2009, 3:43 am
 On Feb 22, 9:50pm, "vaughn"

If this guy wanted to buy an ice cream maker, would you tell him to go
find out how much a quart of ice cream costs, and how long it will
take to recoup his investment? Maybe he just wants a hitech toy. If
you buy a $000 tv instead of a $00 tv, is there a formula to see if
you are getting three times the pleasure of viewing? What is it with
pv that turns engineers into crabby old grinches? People dont ask if
your car is ever going to pay back. Its just a frivolous impulse
purchase based on look and feel. Let him buy his darn pv panels in

Posted by Tim Jackson on February 23, 2009, 8:21 am
 BobG wrote:

The answer to your non-rhetorical question is, in a word, advertising.

When I see home energy / insulation systems being promoted as energy
saving, cost saving, carbon saving or whatever, that actually can never
recover the initial investment they are asking you to make, in any
realistic way, yes this engineer does turn into a crabby old grinch.

And yes I do ask if my car pays back and it does, in about a year. Else
I wouldn't have one.

I've nothing against big boys toys, but they shouldn't be confused with
anything important.

Tim Jackson

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