Check num­bers

Auckland City Harbour News - - OPINION -

Rob, if you are go­ing to com­ment on the re­turns of a so­lar en­ergy in­stal­la­tion, then you do have some re­spon­si­bil­ity to check your num­bers.

I have had a $15000 pho­to­voltaic set on my roof for a year and a half.

The av­er­age elec­tric­ity pro­duced over that time is 11.9 KWh per day.

At the cur­rent Merid­ian pay­back rates that equates to $1.94 per day which amounts to just over $700 a year.

At the time of in­stal­la­tion the re­turn was bet­ter as merid­ian paid the same as it was charg­ing. The re­turn is ac­tu­ally slightly bet­ter still as en­ergy used dur­ing the day while pro­duc­ing a sur­plus is not sold to Merid­ian but di­rectly used, so that is still one for one.

As I have now pro­grammed my hot wa­ter heat pump to only work be­tween 10am and 4pm and I em­ploy my dish­washer and wash­ing ma­chine dur­ing the day, while also load­ing my elec­tric bi­cy­cles in the sun­shine I reckon I save $1000 a year, which means the cap­i­tal out­lay will be paid back in 15 years at stag­nant elec­tric­ity prices and the next 10 years should cough up the in­ter­est and more.

If the Gov­ern­ment and or the pri­vate share hold­ers keep pres­sur­ing the power com­pa­nies to re­duce the re­turns for so­lar elec­tric­ity, then I will be forced to in­vest fur­ther into bat­ter­ies and thereby main­tain my re­turns. Any­way this month’s power bill is $11.80 and that feels pretty good from where I am sit­ting, par­tic­u­larly, be­cause I did not get my so­lar pan­els to make money but to re­duce global warm­ing. It is work­ing too as the in­def­i­nite post­pone­ment of the Denis­ton min­ing is show­ing. Can you please cor­rect the non­sense of a $100 a year sav­ing from a $15000 so­lar sys­tem in your next colum, so that peo­ple are not un­duly put off from mak­ing this switch.

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