Whanganui Chronicle
  • Whanganui Chronicle home
  • Latest news
  • Sport
  • Business
  • Opinion
  • Lifestyle
  • Property
  • Death notices
  • Classifieds

Subscriptions

  • Herald Premium
  • Viva Premium
  • The Listener
  • BusinessDesk

Sections

  • Latest news
  • On The Up
  • Sport
  • Business
  • Opinion
  • Lifestyle
  • Property
    • All Property
    • Residential property listings
  • Rural
    • All Rural
    • Dairy farming
    • Sheep & beef farming
    • Horticulture
    • Animal health
    • Rural business
    • Rural life
    • Rural technology

Locations

  • Taranaki
  • National Park
  • Whakapapa
  • Ohakune
  • Raetihi
  • Taihape
  • Marton
  • Feilding
  • Palmerston North

Media

  • Video
  • Photo galleries
  • Today's Paper - E-Editions
  • Photo sales
  • Classifieds

Weather

  • New Plymouth
  • Whanganui
  • Palmertson North
  • Levin

NZME Network

  • Advertise with NZME
  • OneRoof
  • Driven Car Guide
  • BusinessDesk
  • Newstalk ZB
  • Sunlive
  • ZM
  • The Hits
  • Coast
  • Radio Hauraki
  • The Alternative Commentary Collective
  • Gold
  • Flava
  • iHeart Radio
  • Hokonui
  • Radio Wanaka
  • iHeartCountry New Zealand
  • Restaurant Hub
  • NZME Events

SubscribeSign In
Advertisement
Advertise with NZME.
Home / Whanganui Chronicle

PV means you can go off grid or sell excess power

By Chris Northover
Whanganui Chronicle·
15 Jul, 2013 08:37 PM4 mins to read

Subscribe to listen

Access to Herald Premium articles require a Premium subscription. Subscribe now to listen.
Already a subscriber?  Sign in here

Listening to articles is free for open-access content—explore other articles or learn more about text-to-speech.
‌
Save

    Share this article

Should I buy solar panels?

Several people have asked me if I think it is worthwhile putting solar panels on their roofs. It could cost a lot of money, and they don't want to waste this very scarce resource.

Now, I am not a financial adviser, or even particularly good with finance generally, but I do believe that putting photo-voltaic panels on your roof is likely to be a good investment.

Solar panels are springing up on roofs all over the district. Some of them only heat your water, but some of them (photo-voltaic cells) generate electricity.

You can use this electricity in your home and, if there is any excess you don't need, you can send back to an electricity company and be paid for it. When the sun isn't shining your system can automatically draw electricity back from the grid.

Advertisement
Advertise with NZME.
Advertisement
Advertise with NZME.

Some people store the excess electricity in batteries for use at night or when the sun isn't shining, and can go "off the grid" entirely.

There are even some dinky little hybrid systems which heat water and generate electricity. They can do this because the water is used to cool the PV cells - the heated water is used for your domestic shower etc, and the electricity runs your lights, freezer or whatever. You could probably be better off by more than $1200 a year in power that you don't have to buy from the power company, or money they will pay you for power that you sell them.

One company will pay you 17 cents per unit, and another will pay about 27 cents, but only for the first five units each day, and thereafter the price more than halves. You need to calculate carefully which company you would go with.

Advertisement
Advertise with NZME.

If you wanted to sell your house, one New Zealand study indicates that it could be worth an extra 15 times the annual saving in power costs - say, $15,000 to $18,000 extra. Most PV panels will last a good 25 years.

The only problem with this exciting technology is how to store your energy for when the sun isn't shining. Batteries are expensive and just a tad cumbersome; "grid-tied" systems are good because they are based on an easy-to-understand financial formula - the householder is paid for their excess power by the power company per unit, and buys power back at night from the same company. The rates vary, but one company charges about 50 per cent more for the power it supplies back to you than it pays you for the power you supply it.

This form of "storage" is cheaper and easier than batteries.

It makes sense for the country because if enough people convert to solar generation, we may not have to build another hydro station and kiss goodbye to another river so that we can run our computers, freezers and spa pools all day. They aren't making any more rivers.

As you will have noticed, the main problem with generating electricity from the sun is that you have to be able to store some for use at night.

Good news - there is an Israeli invention that will produce hydrogen from water when sunlight hits a cell containing a thin film of rust (ferrous oxide). It will be possible to store the hydrogen for later use and the system promises to be inexpensive.

It is not known how long it will be before this rust-powered energy factory will be available for you and me, but my bet is that we shouldn't wait for it as it could take many years to develop.

If it were me, I would seriously consider installing photo-voltaic panels. Today.

Save

    Share this article

Latest from Whanganui Chronicle

Whanganui Chronicle

'S*** happens': Injured motorcyclist's gracious response to being hit by car

11 Jul 08:00 AM
Whanganui Chronicle

Why Ruapehu voted against bigger water model

11 Jul 05:02 AM
Whanganui Chronicle

Search for missing man continues after car pulled from river

10 Jul 11:09 PM

From early mornings to easy living

sponsored
Advertisement
Advertise with NZME.

Latest from Whanganui Chronicle

'S*** happens': Injured motorcyclist's gracious response to being hit by car

'S*** happens': Injured motorcyclist's gracious response to being hit by car

11 Jul 08:00 AM

A moment’s inattention by a driver at an intersection led to severe consequences.

Why Ruapehu voted against bigger water model

Why Ruapehu voted against bigger water model

11 Jul 05:02 AM
Search for missing man continues after car pulled from river

Search for missing man continues after car pulled from river

10 Jul 11:09 PM
Community group seeks to manage historic reserve

Community group seeks to manage historic reserve

10 Jul 06:00 PM
Solar bat monitors uncover secrets of Auckland’s night sky
sponsored

Solar bat monitors uncover secrets of Auckland’s night sky

NZ Herald
  • About NZ Herald
  • Meet the journalists
  • Newsletters
  • Classifieds
  • Help & support
  • Contact us
  • House rules
  • Privacy Policy
  • Terms of use
  • Competition terms & conditions
  • Our use of AI
Subscriber Services
  • Whanganui Chronicle e-edition
  • Manage your print subscription
  • Manage your digital subscription
  • Subscribe to Herald Premium
  • Subscribe to the Whanganui Chronicle
  • Gift a subscription
  • Subscriber FAQs
  • Subscription terms & conditions
  • Promotions and subscriber benefits
NZME Network
  • Whanganui Chronicle
  • The New Zealand Herald
  • The Northland Age
  • The Northern Advocate
  • Waikato Herald
  • Bay of Plenty Times
  • Rotorua Daily Post
  • Hawke's Bay Today
  • Viva
  • NZ Listener
  • Newstalk ZB
  • BusinessDesk
  • OneRoof
  • Driven Car Guide
  • iHeart Radio
  • Restaurant Hub
NZME
  • NZME Events
  • About NZME
  • NZME careers
  • Advertise with NZME
  • Digital self-service advertising
  • Book your classified ad
  • Photo sales
  • © Copyright 2025 NZME Publishing Limited
TOP