Pv for s/h/w..... [RE-wrenches]

[john at gosolar.co.nz]

Hi guys,

Thanks for the input but it appears that no-one has given this any serious
thought, to date.

1) What could be easier - a 1 to 2 Kw array connected to a dc heating element
via a MPPT controller.  No inverter necessary, no water pipes on the outside of
the house, no battery bank, etc.

2) It also appears that no-one reads R.E.W. (Renewable Energy World) where they
recently had information on this on the tail-end of an article on s/h/w systems
- p119 to be specific.  Although I have heard of this concept before, it is the
first time I have seen it in print. They also quote the original study done on
it, for the academics in our midst.

3) Although this concept cuts across the grain of the s/h/w guys; to quote Joel,
"..........nothing gets better without change"

                            thanks for that,                    John V

--------------------------------------------------------------------------------

"Tom Lane, Energy Conservation Services" wrote:

> Don't use PV power to heat hot water or Einstein will roll over in his
> grave. It violates the basic laws of thermodynamics and entropy.  Also make
> direct use of the sun energy.  Solar Thermal is 75% efficient - solar
> electric systems used on Earth are 15% efficient - then you have to change
> electricity into heat
> You can freeze a banana and use it to drive nails, but it is better to use a
> hammer.
>
> Gator Tom
> ----- Original Message -----
> From: <john at gosolar.co.nz>
> To: <RE-wrenches at topica.com>
> Cc: "x_Michael Welch" <michael.welch at homepower.com>
> Sent: Thursday, May 09, 2002 6:55 AM
> Subject: Pv for s/h/w..... [RE-wrenches]
>
> > Have any of the US wrenches contemplated using pv direct for hot water
> > systems yet?
> >
> > I believe that the break-point price wise to be economical is approx
> > $1.90 to $2.00/w (US$)
> >
> > Anyone done it yet or about to do it?  It will be great when we can
> > break into that market.
> >
> >                         regards,                    John V
> >
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