Hi Russell,

Looks interesting. The Contact page does indicate an Auckland address.

I've been wondering how long it would be before someone managed to
import some Chinese evacuated tube solar collectors - it was something
I was thinking of looking into myself.

Prices on inverters and batteries (and solar panels) don't look to be
excessive either.

Thanks for the info.
Richard P



On 10/06/06, Russell McMahon <apptech@paradise.net.nz> wrote:
> NZ supplier of solar thermal and photovoltaic, diesel alternator, wind
> and other 'energy converters'.
>
>        http://www.whatpowercrisis.co.nz/
>
> APPEAR to be Auckland based.
>
> Their solar thermal systems would seem to be competitive with mains
> electricity, which is somewhat of a surprise to me.
>
>        http://www.whatpowercrisis.co.nz/shw_lowpress.html
>
> 4 m^2 evacuated tube solar heater for $NZ1100.
> You still have to plumb, pump and control it, but even then the price
> looks good.
>
> In Auckland NZ the mean kWh per m^2 per day is about 2.5 in Winter and
> about 8 in Summer.
> Allowing a low mean of 3 kWh/m^2/day, efficiiency of 50% thermal
> recoverable and electricity at $0.12/kWh (conservative and getting
> worse) that gives an energy output $ value per year of  4 m^2 x 3
> kWh/m^2/day x 365 wioy x 50% x $0.12 ~~= $250/year for the panel
> alone. The 50% efficiency figure affects this linearly. Even adding
> own labour and other costs that looks like a payback of under 10 years
> using a proper DCF analysis which is better than what I'd expect.
>
>
>        Russell
>
>
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