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New PV System being considered - Page 3

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Posted by bealiba on August 31, 2008, 11:17 pm

Solar as a replacement for the grid is hardly ever an economic
proposition. If you are on the grid your first move is to reduce your
energy use as much as possible.

Solar where a grid connection is difficult, expensive or impossible is
an option that can be very worthwhile economically and practically.

The biggest problem is where a person sets out to continue an energy
wasteful lifestyle and hope that they can reduce the dollar cost of
their waste by using solar. Solar power is free, the equipment to use
it as electricity is a longways from being free.

8k for a system. Sounds about right for the industry. As a grid
connect? Well, if he has the readies and wants to give it to somebody
else that's his business. Mind you, 8K would buy a lot of energy
saving technology that will work 24/7

Posted by Eeyore on August 31, 2008, 11:55 pm

bealiba@gmail.com wrote:

PV solar

lot less

get an



replacing every

much on


roof ! Fill

enough is

and winter.


He didn't

1.5 kW 24/7.


attached inverter

I agree without reservation and have made several such suggestions.


Totally agreed again. This is what I call 'tokenism'.

Agreed on the energy saving ! He could be as snug as a bug in a rug.


Posted by adela on September 1, 2008, 4:02 am
 This won't work 24/7. It will generate a lot less kW during the rainy
days and in winter. You might want to consider the length of payback
period so you can figure out how quickly you'll recoup your initial
investments into the PV. Most PV systems have lifetime of around 20 -
25 years but everything depends on the average number of sunshine hrs/
year in your region.

Posted by Eeyore on September 1, 2008, 3:33 pm

adela wrote:

You mean my plan you totally snipped so I have to go back and forth to
check it ?

I know. Just when you want it. The numbers were so absurd I didn't bother
even starting to look at that.

Total insolation is a far better measure and it's 900kWh/m2 where the OP
is. Not frankly a lot. As opposed to 2500 in some parts of the USA.

And you didn't mention how many batteries would be required to cover a
week of cloudy days either.


Posted by Eeyore on August 31, 2008, 11:12 am

Phil wrote:

Chances are at best that it PEAKS at 1.5kW for a couple of hours a day.

Since you have missed out the most important data i.e. how many *kWh* you want
then you're going to be led by the nose up the garden path by unscrupulous


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