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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