Sustainable and Renewable Energy with Solar

Now is the future where you can eliminate your power bill and reduce your carbon footprint with a sustainable renewable energy system.  Esolar.co.nz can design and install an off the grid or grid connected solar panel system to meet your energy requirements and budget. By utilizing photovoltaic solar panels, you will no longer be susceptible to ever increasing power prices, while at the same time reducing your environmental impact. It’s a win-win situation so why wait? Call now for a free quote.

How they work

Photovoltaic solar panels use the energy from the sun, to generate sustainable electrical energy to power your home or business. The energy generated can be fed back into the national grid (Grid Connected system) to offset your energy costs or you can be totally independent of the grid (Off the Grid system) and store the energy in batteries.

How do Solar Water Heating systems work?

  • ­Water from the bottom of the hot water cylinder is circulated by pump through the Heat Exchange Manifold at the top of the collector and back to the cylinder.
  • The pump is controlled by a difference thermostat controller which has temperature sensors in the heat exchange manifold and in the top and bottom of the cylinder.
  • The pump is activated when the temperature of the collector is greater than the water temperature at the bottom of the cylinder.
  • The controller can be set to suit your individual needs.

Evacuated Tube Technology

The Solar Technology Sunsaver uses Evacuated Tube Heat Pipe technology which in conjunction with a Heat Exchange Manifold offers exceptional performance superior to any other type of solar collector.  Higher heat efficiency is due to a combination of the advanced heat transferring style of the Heat Pipe, Selective Absorbent coating and high vacuum heat preservation state.  As sunlight enters the Evacuated Tube it strikes the selective absorbent coating and turns to heat.  Heat is transferred to the heat conduction fluid contained within the copper Heat Pipe. This fluid has a low boiling point and quickly shoots up to the Heat Pipe Condenser Element contained within the Heat Exchange Manifold.  Water passing through the Heat Exchange Manifold absorbs this heat and simultaneously cools the heat conduction fluid causing it to fall again, ready to restart the process.sustainable_and_renewable_energy

How Do Grid Connected Or Grid Tied Power Systems Work?

A PV Solar Grid Connected System

  • Photovoltaic solar panels mounted on your roof, or on a ground mounted frame, use the sun’s solar radiation to generate DC (Direct Current) electricity.
  • The electricity travels to a grid tie inverter, usually located near to the switchboard which converts the DC electricity into 230 volts AC (Alternating Current) as used in your home.
  • The energy generated can be used within the home or business first and any excess electricity is fed into the national grid. If there is little or no solar energy available because of bad weather or at night, energy is sourced from the national grid.
  • A two way (Import/Export) meter is installed in place of your existing meter, to measure the energy you feed in and take from the national grid.

How Do Off Grid Power Systems Work?

A PV Solar Off Grid System

  • Solar generation solar PV panels mounted on your roof, or on a ground mounted frame, use the sun’s solar radiation to generate DC (Direct Current) electricity. (Wind and water turbines are sometimes used as alternative to, or in conjunction with, solar generation.)
  • The solar controller – The voltage and current generated from the solar panels is controlled by a solar controller. This ensures the batteries are charged at the correct voltage, and prevents damage to the battery bank.
  • Battery bank – The DC electricity being generated is stored in a battery bank for use as and when required. The battery bank is sized so there is enough storage for at least 3 days without any solar generation.
  • Inverter / charger – An inverter/charger converts the DC energy stored within the battery bank into 230volts AC (Alternating Current) as used in your home.
  • Back-up generator – If there is little or no solar energy available for a number of days, the inverter/charger will automatically start a backup generator and re-charge the battery bank so that you are assured plenty of power.
  • Optional monitoring. It is possible to set up remote monitoring of the system, if required.

For a residential ON GRID power system

SystemProduces
2kwp2,600 – 3,000 kwh per year
3kwp3,900 – 4,500 kwh per year
4kwp5,200 – 6,000 kwh per year
5kwp6,500 – 7,540 kwh per year

For a residential OFF GRID power system, we recommend

For aWe recommend
Bach/small daily power load2kwh system
Small home/low power load3.5kwh system
Standard home/average power load5.5kwh system
Above average power load8kwh system

Solar installers throughout New Zealand

Solar Electric Technology Ltd is one of New Zealand’s leading solar companies.

We offer complete energy solutions for homes and businesses. We cover all of New Zealand and provide an all in one design installation and customer care service. Our website can streamline a quote for you, we offer the required information and system specifications and downloads for obtaining a building consent and drawing the system information into the plans.

Solar panels can be easily installed on your roof and is fast becoming popular as a way to offset energy costs. Whether you want to go off the grid or remain connected we can sort out your individual wants and needs.

The price of photovoltaic solar panels has dropped considerably so now is the best time to invest in sustainable energy.
New Zealand is a fantastic country to utilise solar energy, let’s look at the statistics.

In Northland well over 1900 sunshine hours are recorded annually. Auckland records well over 2000 sunshine hours annually. The Waikato records well over 1800 sunshine hours annually. The Bay of Plenty and Gisborne record the sunniest at over 2300 hours annually. The Hawkes Bay over 2200, Manawatu and Wanganui over 1900, Taranaki over 2000 and Wellington over 1800 hours annually. Then in the South Island Malborough records over 2200 sunshine hours annually, the Tasman is sunniest at over 2500 sunshine hours annually. The West Coast 1800, Canterbury 1900, Otago 2200 and Southland 1600 sunshine hours annually. That’s a lot of sunshine.

Let’s look now at the benefits of PV and thermal systems. Price is a big benefit; module prices have fallen dramatically while energy prices continue to grow at a rate of 7.5% per annum on average. After installation commissioning maintenance is hardly needed. The solar modules are stable and extremely durable and have a long performance guarantee of 25 years. Solar energy has the highest long term potential of all renewable energy sources. Environmental benefits are of course huge. New Zealand is a front runner in being environmentally friendly.

New Zealand is a sunny country as has been shown so utilising the sun is easy. It is regenerative and economical. It is possible to provide very exact forecasts of the yields to be expected. So it’s a win win, save money and the environment, what’s not to love. Call us now or use our online quote system, you won’t be disappointed.

To find one of our New Zealand Installers in our area, please visit our contact page and click on the map for your relevant area.

The Future Is Here With Battery Powered Homes

So what is next for our homes in the future? The answer? Battery powered homes. Many have been making the transition to solar power which is fantastic, the next step in getting away from fossil fuels is in batteries. It is expected that over a million homes in Australia will have a battery powered home in the next five years. We have battery powered cellphones, battery powered cars are taking off so the leap to battery powered houses is the next obvious step, and it is already being taken.

 

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We are talking about the lithium-ion battery which supplies 24 hour renewable power. Solar panels can only do so much and you still have to rely on the grid however the battery has 8kw hours of usable stored power. The unit is about the size of a beer fridge and holds the battery, an inverter to make it usable for the house and energy management system controls in a little display on the door of the unit. The software tells the unit when to flow and where. The first house using one gets a large 53% of power from the battery, 44% from the solar panels and 3% from the grid.

 

Lithium-ion is the lightest metal and was first made in the 1980’s but it easily combusted so lithium cobalt oxide was found, this went into electric cars and is what is now entering our homes. Thus giving the option of three scenarios, for those that are sick of power companies and/or want to be off grid altogether they need to buy a big enough battery to survive a cloudy week. Scenario two is living mainly off grid just using it for a backup. The third scenario is using the battery at night to avoid the expensive peak time power prices.

 

What about cost? Well in early 2015 a 7k battery plus inverter installed would be about $15,000. However already in six months that price has dropped by about a third. Companies are leaping on board seeing the future heading there. For example in Adelaide homes are offered a $5000 rebate if a battery is installed. You see on the grid there is little power stored, the power stations are turned up or down in response to use, but if there is a sudden spike in use power stations have to turn to small stations to help supply the need. So batteries can help the grid running smoothly by the main stations buying power from a battery in homes which is why the big companies are getting on board.

 

What about apartments or strata housing, how would it work with them? The strata would install them, the tenants would pay strata for electricity and strata would supply it. Whole suburbs can work with this new technology, Alkomoz beach is building and will have enough battery power to power 100 houses for 24 hours. They work on a grid credit system, they make power during the day then buy it back at night with the credits.

 

Where to from here? Even better batteries are being invented like the zinc bromide battery which has two electrodes, a coin cell and a gel on top instead of liquid. This makes the battery charge faster, it’s bendy and won’t crack and has a longer lifetime that lithium. Builders want to put them into walls to power the home.

Watch this space….

Looking For A Solar Solution For Your Business?

solar_systems_for_businessYou have solar on your home and are aware of the benefits and are enjoying enormous savings on your power bill. So why not apply the same benefit to your business through a solar solution? Solar can help businesses lower energy expenses just as much as on a residential property, if not more.

 

Esolar can help you to find a solar solution for your business no matter what your requirements or how big or small your business is. Whether you are looking for a grid connected application or an off grid system, we can design a system that can perfectly fit your needs.

 

More than 95% of business solar installations we do are grid connected systems. The benefit of this is because if your business does not use all your generated power, it can be sold back to the grid.

 

Off grid is also an option, however, if you business is situated in a remote area or you would like to be fully independent from the power grid. We have helped a number of businesses all around New Zealand to find an off grid solution that works for them.

 

For more information on solar for business, visit our solar systems for business page.

What does PV or Photovoltaic mean?

Photovoltaic (PV) essentially means electricity from the energy of the sun and is derived from the words “photo” with the Greek meaning light and “voltaic” meaning voltage. The term “photovoltaic” is used to describe a process known as the “photovoltaic effect” the process by which a material such as silicon converts sunlight into electricity.

 

PV cells are laminated to a thin sheet of glass. Sunlight in the form of photons strike the PV cells, exciting electrons in the silicon. An electric current is generated when the electrons are collected by wiring that is incorporated into the PV cells.

 

photo_voltaic_panelsA solar panel consists of multiple PV cells, the amount will depend on the output voltage and current required of the solar panel. Solar panels range in size from around 5 to over 400watts peak output and produce DC (direct current).

 

Multiple solar panels are connected in strings, to build a solar array. The size of the array will depend on how much energy is required to be generated, generally up to 10kWp for a standard domestic installation in New Zealand.

 

The DC energy from the solar array can be stored in batteries and then converted to AC by an inverter as when required or you can convert the solar energy directly to AC with a grid connected inverter and feed any excess energy into the national grid for credits.

 

 

 

Heat Your Water With A Heat Pump

How can a heat pump water heater help you? Did you know that up to 50% of your monthly power bill goes to just water heating? It might be hard to comprehend but it is generally the biggest single power consumer a house will have. Naturally, this is then the first point to address if you are looking to save power.

 

Heat_Pump_Water_HeaterA heat pump water heaters can save you up to 75% on your hot water heating bill. Our heat pump water headers deliver the highest seasonal efficiency of any water heater available.The best part is that they can also be used in conjunction with a solar system, meaning not only is your water heated for free, but it’s done so in a very efficient manner so that you have hot water for longer.

 

The Econergy heat pump water heater has been rated number one in Consumer Magazine’s heat pump water heater test. Econergy is being recognized as one of the best water heating options for your home, and solar PV panels can provide energy from the sun to power the heat pump.

 

If you are interested in an Ecoenergy heat pump for your home, visit our heat pump water heating page and give us a call today!

 

Do You Go With Grid Tied Or Off Grid Solar?

When designing a solar system for your home, the biggest decision you need to face is whether you go with an off grid or a grid connected system. There are various factors that will determine your decision in this instance.

 

grid_connected_or_off_grid_solarWhat dictates which system you go with? A major factor will be firstly whether there is a mains power connection. In a rural area without mains power, the only option will be the use of off grid. However in suburbs and city areas, both systems can be used, though generally a grid connected system is used. Other factors include how much power you require, whether you can store the power generated or you’d rather feed it into the mains power and always have power on hand whether or not your system produces enough.

 

If you can’t decide and would need some advice, give us a call today to discuss which option is best for you!

Get Hot Water With Solar And Save!

One of the greatest costs in energy to the average household is that of water heating. On average, water heating accounts for a third of your power bill. So what can you do to reduce this and save that 33%?

 

Solar_hot_water_heatingSolar hot water heating is the solution to saving every month on your power bill. For a small investment upfront (to purchase and install the system), you can free yourself from the monthly burden of paying your energy bill.

 

Many people have started switching to solar hot water heating and have seen the results that solar can bring in terms of saving energy and providing an alternative solution to heating your water. An efficient, properly designed and built solar water heating system should be able to fully heat your water without any external support, meaning completely free water heating!

 

If you are interested in heating your water with solar, talk to us today!