making solar easy

solar combined system

© SOLARZONE New Zealand Ltd 2012


5a Arko Place

Paraparaumu, Kapiti Coast

Wellington, New Zealand

+64 (4) 297 3062

These are illustrative figures to give a ball park estimate of costs and benefits. It’s important to have your particular property assessed for its suitability

and to get an accurate estimate of costs and benefits. Costs may vary according to the type of roof and its accessibility.

Benefits may vary according to the amount of usable, generally north facing, unshaded roof area, as well as the electricity retailer you decide to use.

We will happily provide this assessment at no cost. Just contact us.



Req’d roof area

Sq. Meters

Energy savings

kWh equiv.

Annual savings     

At today’s’ electricity prices

Annual return

% on net investment

CO2 Savings

kg’s per annum

3.0 kWp

solar electric

$ 14000



$ 978



2 X CR110  300 L

solar hot water

$ 8800 (Net)



$ 680




$ 22800



$ 1658





Last but not least

As electricity prices increase, as they surely will, the capital value of energy efficient buildings will increase.

Overseas studies show that the increase in value can be roughly 15 times the annual electricity saving. For example if you are able to save $500 on your electricity bill you could add $7500 to the value of your home.

This trend is not yet fully evident in New Zealand but it’s reasonable to expect rising electricity prices will see New Zealand home values follow suit.

Certainly installing a solar hot water system will protect the investment in your home.

At the very least installing a solar electric and/or solar hot water systems will protect your investment in your home.

Of course annual savings and the annual return will increase as the price of electricity increases above today’s level. The chart shows the increase in average residential retail prices over the past 10 years ( about 8% p.a.) - we leave you to  draw your own conclusions as to future increases.

How it all works

Solar electric + solar hot water systems

In an energy neutral home, the amount of energy provided by on-site renewable energy resources is equal to the amount of energy used by the building. For the electricity requirement this means that whatever electricity is imported from the grid will be balanced by electricity exported to the grid.

All strategies to achieve energy neutrality should start with reducing demand – from the smallest things like turning out the lights when not in use, through to ensuring your home is adequately insulated.

Beyond this point, generating your own energy is necessary to approach or achieve an energy neutral goal.

Solar hot water systems will help out with the energy used to heat your hot water. Click here for more

Grid connect solar electric systems will help by replacing some or all of the electricity you consume during the day and offsetting the electricity you use at night. Click here for more

The Value Propositions for both systems are similar – but the roof area required to mount the systems are significantly different.

Solar hot water collectors produce annually just over 3 times the amount of energy per sq m as that of solar electric modules.

So where roof area is limited, as it often is, the two technologies work well together to approach an energy neutral goal.

The following example, typical of several recent installations, produce /saves 6197 kWh annually. That equates to 87 % of the annual energy consumption of our average Wellington home. Click here for more

To achieve the same energy savings with solar electric alone would require about 57 sq. M of roof space.