Use a low-wattage (150W) and high-wattage (370W) example to establish a range (ex: 17-42 panels … The best way to do this is obtaining your historical power consumption from your power retailer, and analysing this to determine the optimal solar power system size. Read from the start, or use the menu to skip to the sections you are most interested in. If you are planning to move on from your property within the next five to seven years, you need to consider whether you will get the expected return on your investment. So it’s important to be realistic. The rate is known as the ‘solar buy-back rate’ in NZ or ‘feed-in tariff’ overseas. The recommendation could be for a solar power system that generates 50% of your average monthly energy consumption. Do your homework. You have a solar system controller, which automates this load shifting. Small solar panels Yet, you can also find panels … Solar Calculator. Before you start shopping for solar installers and debating solar panels, inverters and efficiencies – you should first look inwards. The number of solar panels needed=5000/240=20.8 solar panels. Simply select the type of car or motorhome you have, and select your towing unit if you’ll be using one. Calculate the amount of solar panels you will need to heat your pool. The number of solar panels that you need depends on the system size that you select. She is at home during the day with two kids, and actively works hard to maximise self-consumption by using appliances such as the washing machine, dryer, dishwasher etc during the middle of the day. Those solar panels used for residential purposes range from 150 watts to 370 watts per panel, depending on the panel size efficiency and cell technology. The most important point to remember is that your solar system output should match your consumption habits. Typical questions that will be asked are: For example, my power bill might show that I am using on average 700 kWh (units) of power per month. Let’s consider the Mitsubishi Electric online calculator for solar in New Zealand. I would caution against this type of rough sizing for power hungry residences and definitely for commercial premises. Solar panel type and quality make a significant difference in terms of solar output and efficiency. No matter whether you are a homeowner or a business owner. You should aim to use your solar power, not export it. If you are like me and partial to a Tim Tam, you’ll know there is no substitute for quality. Please, use the update button below the calculator body to update the … As an engineer,  I think there is a place for detail, analysis and optimisation. (2) They are particularly good for our most sunny regions, such as Northland, Auckland, Nelson, Bay of Plenty and Marlborough. Most of New Zealand is suited to PV solar panels with good sunshine hours annually. After rounding it up we receive that you need to buy 21 solar panels. But before you can reap the rewards of solar power, you need to establish how many solar panels you need … This is even easier if you have a smart meter installed; you should be able to see your daily usage either on the bill or by checking you… A good salesperson may sell you on an amazing payback period based upon shifting almost all of your consumption to the sunniest part of the day. If I am in Auckland, using 700 kWh per month and my power company charges me 25c per unit of power – the output looks something like this: The website matches the closest Mitsubishi solar package to a 50% usage target, which in this case is the 3.24kWp package. They will know how previous installations have performed, how much customers they are saving on their power. Finally select all the appliances that will require power. Divide the watts you need to produce per hour by the rating of the panels you want to purchase and round up. Different panels will have different watt ratings, so you have choices about which ones to purchase. In the example above, you would need 24 solar panels to account for 80% of your average consumption (29.6 … If however you are on a prepaid meter (the evil things) then you will need put a power … How much can you afford to invest in a solar power install? This will tell you how many panels to use. This is an increase of 30% over the preceding 12 months and more than double the 5,000-odd installed only two years earlier. From this you can figure out the average daily usage. This method can be inspiring for homeowners, dreaming of generating 50% of their own power usage. Now, where did my wife hide that packet…. This is covered in more detail under solar panel sizing below. Otherwise, you are gambling that your system will achieve your solar goals. This method is often used in conjunction with the ‘rule of thumb’ sizing and is common for solar installers, online solar calculators and panel manufacturer websites. For my example, it looks like I will save $1,184.25 (highlighted). Only a pittance paid for exported power. Now to the actual calculations you need. ... To help people do the maths, it has put a solar calculator on its website. Determine how many solar panels you’ll need One solar panel produces about 1.24 kWh per day. The solar panel calculator can help you work out what equipment you need to fully charge your next camping, caravaning or off-road adventure. How much of your power do you want to come from solar. A standard panel … Also consider the condition of your roof. Residential installations in NZ can vary from a small 1.5 kW installation, up to sizable three-phase solar systems of 8 – 10 kW. … The most important step is to ensure your system is sized correctly in the first place. The chart below from demonstrates a typical residential solar scenario, showing the timing difference between what you generate and what you use. A friend living north of Auckland has solar. The importance of matching generation to consumption is known as also referred to as ‘self-consumption’. A properly sized solar panel … However, you can have a different number of panels for the same size system. Historical usage data from your power meter is reviewed to understand your typical daily and seasonal power usage. A typical American home will need 14-36 … Save Power | Save Money | Save the Planet. Will they care if the solar installatioin is 2kW or 5kW? Your actual consumption, you will be able to see the influence of large energy consuming appliances such as heat pumps, air-con, pool heaters, hot water cylinders and lighting. If you are going off-grid, then a lot more thought needs to go into the sizing decision, coupled with energy efficiency and intelligent storage of surplus energy. In NZ, although you might pay 25¢ for each unit of power you from your power company, if you export excess power during the day you’ll only receive a paltry 7¢ – 8¢ for each unit sold back. A home that consumes 1,000 kWh per month will normally need between 20 and 30 solar panels. Using our tool, we factor in: Improved Shade Analysis – Powered by Google Sunroof data, all estimates consider the shading and irradiance levels of every roof plane, with the panel … Next you choose the auxiliary battery bank size you’ll be running. Based on their experience with other customers and their solar performance, they can recommend a certain size for your installation. All rights reserved. Welcome to SPCNZ - the leading solar power installation company in New Zealand. Minor scratches and scuffs, typical for a used panel. The perfect system size will depend most of all on you. Be it six days or six months. For residential at least. Available 250W and 255W panels from: YingLi. To calculate how many solar panels are needed, multiply a household’s hourly energy requirement by peak sun hours for the area and divide by a panel’s wattage. This will maximise the return on your solar investment and avoid your panels being just an expensive ornament. Use the solar panel sizing calculator to determine the right amount of paneling you will need to heat your pool year round. Or better yet, look at your actual historical consumption and make a fully informed decision. At the end of 2016, there were around 11,000 residential and small commercial solar installations according to the Electricity Authority. Like the oven to cook dinner, TV in the evening, lights when it’s dark and maybe charging the electric vehicle overnight. I work from home during the day, but our consumption remains pretty low apart from the typical evening peak. How Many Solar Panels Do You Need to Power Your Home? What you should aim to determine is the ideal amount of generation you require from your solar power system. There are a couple of options for sizing a solar power system. Once you have this data, you can then make an informed decision whether this load can be shifted (manually, or using a smart controller) to the middle of the day to benefit from solar. Will the new owner pay a premium price to reflect the solar installation? Is it likely to need painting or replacement anytime soon? Which is totally unrealistic for most people. This is why I am writing this article, to help you install the most efficient solar system for you. For the example, if 500-watt … Sizing your solar investment based upon actual consumption is the best way to avoid over or under-sizing. While you used to religiously set you dishwasher for midday, you forget every second day and end up putting it on after dinner. By utilising battery storage (currently not economic), altering your power usage habits, using a smart solar controller or all of the above. Here’s an example from Solar King in Takapuna: For small to medium consumption residential customers, a ‘rule of thumb’ approach can be appropriate in scenarios where some of the following items apply: If some of these items apply, then the risk of dramatically over or under sizing the solar system is pretty low. A 6kW solar panel system produces enough electricity to match the average New Zealand household's consumption of grid produced electricity (which is 7,000kWh a year). Therefore : To ensure the best return on your solar investment, the amount of power you generate must be matched to your power consumption habits. The power output of solar panels is measured in watts (W) and can … Few things about solar panel output efficiency. With solar, if you’re not using the power generated by your panels then it is typically exported to the local power grid for others to use. This allows you to talk specifics with potential solar providers. A 3 kW installation will generate enough energy to make a significant dent in your power bill, while still being in the $10,000 or less price range. There is also a place for trial and error, ‘rule of thumb’ and local experience. This sizing guide is focused on grid-tied solar and helping get the best ‘bang for your buck’. REDARC have a range of solar panels and blankets that are designed to the highest quality to maximise efficiency and integrity. For residences, a system size around 3 kW is popular. If you don’t know what I’m talking about, I’ll back up a moment. Supplied by SEANZ (the official solar association of New Zealand), this solar calculator can help determine the annual savings and payback period you can expect from a solar power system … Next, we need to look at how many solar panels can fit on your property. So, to offset 50% of my 8,400 kWh on an annualised basis I would size my system for 4200 kWh per year. To start with we work out what sized batteries we need and then what size solar panels we need to charge them. The average installed system size is around 3.6 kW. However, matching a system size to your power demands won't eliminate your power … Click here to use our interactive solar power system calculator or to find your local solar panel technician. Well, it’s all the energy generated by the recommended 3.24 kWp package multiplied by 25c electricity price. Panels have been tested and have good output. New Zealand Average Installation Sizes Residential installations in NZ can vary from a small 1.5 kW installation, up to sizable three-phase solar systems of 8 – 10 kW. Disclaimer: These output calculations use sunlight data supplied by the New Zealand Bureau of Meteorology from most New Zealand … This is a basic method, best used at a local level by a trusted solar power installer who has a solid understanding of the local area. So… all I am saying is beware or the small print and assumptions when a solar panel manufacturer or installer quotes you savings and payback periods. The easiest way to figure this out is to look at past electricity bills, which should tell you how much power you've used in the previous month or quarter. To get these numbers, we used high and low panel production … Solar panels are a great way of reducing energy bills while lowering your carbon footprint. For increased accuracy, there must be some input from the home or business owner on their power usage habits to get at least a roughly accurate result. Solar Panel Sizing Calculator For In-Ground Pool Heating. Solar.com has substantially upgraded its solar savings calculator to provide more accurate cost and savings estimates with solar. Solar panels convert the light from the sun's rays into electricity, so you don't need … There may also be some load you can’t shift. Off Grid Solar Calculator -Off Grid Solar in this case refers to battery stored solar panel systems, either connected to utility or standalone. All you do is plug in your location, average monthly power usage and average cost of each unit (kWh) or electricity. Online store by, LOW FIXED FREIGHT FOR ALL NEW ZEALAND ORDERS. “What size solar system do I need?” The size of your solar power system, and therefore the number of solar panels you need, should be informed by your electricity usage patterns and what you want to achieve.. If I used a decent amount of energy on weekdays, payback time falls to 15 years … The second major restriction is often the installed system cost. Lets work out the Watt-Hours we'll be using, our load … Look at whether you can realistically shift load to fully utilise your generation. Which in Auckland equates to around 3 kW of optimally placed solar generation. During the sunny month of February, this was her household bill: What you should notice is that even with her best efforts, during the sunniest part of the day there was still solar power exported. The solar panel calculator can help you work out what equipment you need … Ask them about the assumptions made when they demonstrate a five year or seven year payback period. Once you have determined the generation required from your solar system, the next step is to look at the practicalities of installation and cost. The recommendation could be for a solar power system that generates 50% of your average monthly energy consumption. It’s just not accurate enough, and there is a serious risk of exporting significant power, not being able to self-consume and having a detrimental effect on system economics. A 5kW solar system can be made up of … Solar system sizes are measured in kilowatts and, depending on where you are and which direction your roof faces, each kilowatt of your solar panel … For the most accurate and personalized off-grid system size calculation, call our solar … Let me demonstrate with a real life example. How Many Solar Panels Do You Need? You can't correctly size your solar PV system unless you know how much electricity your home uses. The benefits of solar power panels need to be carefully weighed against the costs, EECA says. I’ll summarise them quickly here, then go into more detail on each below. The typical homeowner will need 28 – 34 solar panels to cover 100% of their energy usage (dependent on location and roof size). One major restriction may be the available, suitable roof area for your solar installation. Canadian Solar… Sizing your solar investment based upon actual consumption is the best way to reliably avoid over or under-sizing. These 250W and 255W solar panels are used and in good physical condition. I’ll guide you through the right ways, and wrong ways, to determine your solar power system size in an unbiased, data-driven way. REDARC solar panels are easy to use, portable and highly efficient, however it can be difficult to work out which type and how many are best suited for your trip. My family is no different, we use most of our power when the kids get home from school, I’m cooking tea, Mrs Power Guy is popping the washing on etc. If you buy more than one panel, all shipped panels will be from the same manufacturer. Test how much power you need to deliver to your appliances every day to keep them charged using the REDARC Solar Calculator. This is kind of handy, but I the stated “Annual Electricity Cost Saved” figure is a total load of rubbish. They will definitely hear about the installations that don’t perform as expected. REDARC solar panels are easy to use, portable and highly efficient, however it can be difficult to work out which type and how many are best suited for your trip. 700 x 12 = 8400 kWh per year. Equally, when sizing the output of your solar power system there is no substitute for actual power usage history. This is the gold standard for sizing a solar system and is especially important if you are using a lot of power, such as a large home or business premises. But realistically, in my experience, most people go back to their old habits after a while. Experienced solar installers will know their systems and their local area and will  get feedback from previous customers on a daily basis. If you encounter any display or technical problems, or have any other feedback regarding the Solar Calculator, please send an email to: power@redarc.com.au. Once you know how much energy you’re using over the course of a year we can begin to work out how many solar panels you’ll need. At the end of 2016, there were around 11,000 … Copyright © 2020 REDARC NZ. Updated December 11, 2020 The amount of solar panels your home needs depends on the amount of energy your home needs, as well as the efficiency of your panels. How many solar panels do I need? Solar System Output Calculator; ... Write down how big your solar system would need to be in kW. It can also be used to provide misleading economics and savings calculations. There has recently been an uproar from solar customers in Australia as their government has moved away from subsidising solar with artificially high buy-back rates. Other factors such as peak load, shade, location, available panel space, and seasonal use need to be taken into account. So back to Australia, they now have an unsubsidised solar environment now very similar to NZ (hence the uproar I guess!). This can be done in a number of ways. The solar panel calculator then estimates how much your total appliance power requirement is per day and suggests products and equipment that will help you meet those needs. This is a really simple calculator that recommends you a solar system size based upon power bill data. Also, note the difference in price between export and import. Ideally, we’re looking for a north-facing roof or elevation, free from shading and at a pitch of between 10 and 40 degrees. For instance, monocrystalline photovoltaic (PV) solar panels are known to be the most efficient solar panels … If you want to install solar panels, you should weigh up the potential costs against the potential savings. Here’s another example from  Energy Matters in Australia, which starts to also consider your home appliances. This ‘50%’ figure is also referred to as the ‘grid offset’, i.e. The area of ‘optimal’ roof space you have available for solar panels. How did they get this figure? Complementing this range are the REDARC Sine Inverters, Regulators and In-Vehicle Chargers, Solar Regulator Cable Kits and other accessories that will create the perfect solar power setup. According to the calculator, the best thing I could do to improve the economics of solar would be to start working from home. As it is a data-driven approach, using your actual power bills, it’s also often the method adopted by online solar calculators and panel manufacturer websites. Buy-Back Rates are (unfortunately) Rubbish, Options for Solar Power System Sizing (in brief), Watch the Small Print & Remember the Importance of Self-Consumption, Your solar goals – personal, environmental and financial, Where you live and how much sunlight you get, and (of course), You are considering a smaller solar installation, There is the ability to shift load such as your hot water cylinder using timers, Appliances such as washing machines can be delayed to start during the middle of the day, and/or. I want to ensure that you get the most out of your solar power system and don’t get ripped off. Not all solar panels are the same. Solar power systems for households rarely go above 10kW in size. You do get paid for this excess energy. 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