Harness free energy from the Sun and "go green", save money and reduce or eliminate reliance upon electricity suppliers.

How does solar energy/electricity work?

Photovoltaic solar panels harness the Sun's light converting it to electricity by passing it through special silicon crystals. Solar panels are arranged in groups or arrays - the more panels in an array the more electricity can be generated.

The electricity generated by a solar panel is Direct Current (DC). Residential electricity operates on Alternating Current (AC) so the generated DC electrify must be converted to AC using a electronic device called an Inverter. Once converted the electricity is available for use in your home.

Solar energy systems can be Grid-tied or Off-grid.

A Grid-tied system supplements the electricity supply from your electricity retailer. Some electricity suppliers will allow you to "sell back" excess electricity you generate further reducing your monthly electricity bills. A Grid-tied system can also be paired with a storage battery to harvest excess electricity. Warm and Cool are agents for Sonnen grid-tied batteries.

An Off-grid system replaces the role of an electricity supplier making you electricity self sufficient. An Off-grid system requires an electricity storage battery to achieve this making electricity available outside of daylight hours and accommodates electricity consumption at a rate higher than the generating capacity of the installed array of solar panels. Warm and Cool are agents for Redflow off-grid solar batteries.

Returns better than a bank investment... and tax free

In a period of record low interest rates, returns for bank investors are historically very low. Use the simplified calculator1 below to compare a bank investment with an investment in solar energy.

Mostly at home
Mostly out

This calculator is intended as a guide only. Actual savings will vary according to exact household and sunshine hours experienced.

Solar electricity production is calculated from average sunlight hours for a central Dunedin location (data supplied by the NZ Bureau of Meteorology).

System costs are not intended as an offer and INDICATIVE ONLY. Contact Warm and Cool for current pricing.

No allowance has been made for the buy back of any exported electricity as availability and rates vary across electricity retailers.

Solar panels

Canadian Solar Photo Voltaic Panels

Warm and Cool supplies panels manufactured by Canadian Solar. Founded in 2001, Canadian Solar is a global energy suppler with representation in 19 countries across 6 continents. With state-of-the-art manufacturing facilities in Canada, China, Brazil and South East Asian countries, Canadian Solar is a global player having delivered more than 33 GW of premium photo voltaic modules to customers in more than 150 countries. Canadian Solar’s solar panels are manufactured to the very highest standards and are designed to deliver continuously high performance in the most testing of environments.

Warm and Cool chooses Canadian Solar’s KuPower High Efficiency Poly Gen 3 panels which typically offer higher power classes than equivalent competing panel sizes, with an efficiency of up to 17.15%. Efficiency relates to how much of the sun light hitting the panels can be converted to electricity. The Gen 3 panels are well engineered and suitable for heavy snow and wind loadings, coming with a 25 year linear power output warranty and 10 year materials and workmanship warranty.

Solar arrays can be mounted on the roof of your home or on ground-mounted frames. If you have a roof area with a northerly aspect, you will also need to check to see if your roof has suitable space available, as arrays are quite large. Canadian Solar’s KuPower High Efficiency Poly Gen 3 panels measure 1675mm high x 992mm wide (1.662 m2 each). A typical 2.0 kilowatt array includes 8 panels, needing a 13 m2 area.


Enphase micro inverters

For solar generation, the most efficient type of inverter technology is micro-inverter. A micro-inverter differs from a conventional setup which shares an inverter across a "string" of panels, by instead utilising a small (micro) inverter attached to each panel in and array. The advantage of this is that each panel in the array can operate at its most efficient output according to the lighting conditions it is currently experiencing and not the conditions of the lowest performing panel. For example if one panel in a conventional setup is in shade, and therefore producing less electricity than it could when in direct sunlight, then the electricity generated by all other panels sharing an inverter will be limited to the output of the shaded panel. Using micro inverters instead will allow all panels to maximise their output independent of what other panels are achieving.

Warm and Cool chooses Enphase Micro-inverters which offer the most advanced inverter technology on the market, resulting in higher production, greater reliability, and unmatched intelligence - Enphase inverters are paired with sophisticated monitoring software which allows you to easily gauge performance and detect faults with the aid of automated alerts.

System Capacity

Most urban houses will find a 2.0 or 3.0 kilowatt per hour system is suitable. We can install as small as 1.5 kilowatts or as big as your situation allows.

Capacity 2.0 kw 3.0 kw 4.0 kw 5.0 kw
Panels 7 11 14 18
Area Required 18 m2 20 m2 23 m2 30 m2

Future Proofing for Solar

Whether you are intending to go solar now or are undecided, talk to us about how to future proof your new build for solar energy.

For more information about Solar Energy solutions please contact us today

Servicing Otago, Southland & Canterbury























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