Sizing your solar power system requirements,pdf of solar power system kit,solar panel rebates louisiana,home solar power systems india - PDF 2016

Published : 29.09.2014 | Author : admin | Categories : Solar Panels Home
One of the biggest challenges in modern solar system design is how to properly design a stand-alone solar system. For everything that uses electricity in an “off-grid” solar system, there needs to be an estimate of the average number of hours per day it will be turned on and drawing power, as well as the number of watts it will use. To size the solar array based on the average daily electric load obtained earlier, you will need to know how much sunlight hits your site on a daily basis.
The section titled “Sun Hours” can be used to find the available solar resource for a location for any orientation. There is a very good reason that having back-up power lets you get away with a much smaller solar array.
With the daily load in watt hours and the solar resource in sun hours, the solar array size can be calculated. If the average daily load in Watt hours has been calculated already from the section “Load Estimation”, then the only factors that need to be obtained are the days of autonomy and the maximum depth of discharge. The days of autonomy represents the longest amount of time the off-grid solar array will have to deliver power for your loads while you are unable to charge the batteries. Another reason to set a maximum depth of discharge is the chemistry of deep cycle batteries. As a consequence of this, you need to be aware of where you plan on locating the batteries for a stand-alone system. In addition to continuous loads, sometimes there are “surge loads” that your inverter will need to be able to accommodate. Affordable Solar is committed to helping solar contractors grow their business by offering innovative financing and credit solutions, giving the best value on high quality solar energy system components, and providing business solutions that enable installers to increase their local market share.
Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Note: Typical power output is based on 6 hours charging per day and will vary at different times of the year, by location, and with varying weather conditions.
Tens of thousands of Victorian solar households participating in the State’s Transitional Feed In Tariff will need to take action soon! Such a huge reduction will be felt by many via increased electricity bills in just a few months from now. As we’re now in the second half of 2016, Victorians who will be affected really need to start planning and taking action as the remaining months will fly by. For personalised and obligation-free advice, call our friendly Victorian solar team on 133-SUN.
4) After December, will my electricity tariff and contract conditions change – and if so, what are the changes? Remember there’s nothing stopping you from shopping around for an electricity retailer that is more solar-friendly.
It’s also important to bear in mind while some electricity retailers may offer a higher solar feed-in tariff rate, there may be other charges or conditions that make the rate less appealing – so always check the fine print. New generation battery systems can enable you to make the most of your valuable rooftop-generated electricity; reducing the amount of mains-grid supply consumed and minimising solar electricity generation exports to the grid.
Starters Range – the new Enphase Battery is a modular solution, enabling you to expand your storage system as needed. Advantage Range – Sonnen battery systems and Telsa Powerwall are perfect for more demanding storage and power requirements.
High Power Range – Fronius Solar Battery and Sonnen are very robust solutions for situations where extra discharge and storage capacity is required. Discover more about home energy storage – call our friendly experts on 133-SUN – or try our new, easy to use solar + battery calculator for information on the level of energy independence you could attain. Currently, a very popular system capacity is 5kW – and such a system can be purchased at around the same price a 2kW system did just a few years ago.
With solar pricing now so low, it may be a great opportunity to install more solar panels and upgrade your inverter – make the most of your rooftop real estate! A 5kW solar power system is also a great choice if your plan is to install energy storage at a later date.
For pricing enquiries, request a quote online or call our friendly team on 133-SUN for further details.
We’ve assisted tens of thousands of Australian households and business reap the benefits of generating their own electricity through harnessing the power of the sun.


Call our friendly team on 133 SUN to discover more about Energy Matters and how we can help you make the most of your system after the 25c Transitional Feed In Tariff ends. All variations of off-grid solar power depend on solar electric panels and store electricity in a bank of batteries.
Sizing Your Offgrid Solar System - Based on your existing use of electricity, figure out how many panels your off grid system will need to produce. Load Evaluation Worksheet - If you are building an off-grid home, this will help you estimate how much electricity you will need. While AC off-grid solar power systems are more expensive because of the cost of the inverter, the appliances you are able to use are less expensive and there are more kinds of appliances to choose from. Small off-grid DC solar power systems can power tele- communications electronics in locations which are far away from power lines. Unlike a grid-tied system, a solar system with batteries consists of three separate systems all working together to create, store, and deliver energy for your electric loads. By multiplying watts times hours, the total amount of energy that it will need for the day is found. The “Kill A Watt” monitor can be used to find out how much power is being drawn at any specific moment, or how much energy is being used over time in watt hours.
Power is the amount of electricity being used or created at any moment in time, while Energy is the amount of electricity that is used over time.
If you have not read “Sizing Grid-Tied Solar Arrays”, it is recommended that you do now because this will directly reference its sections on sun hours and system efficiency. Calculating the number of sun hours your site will receive, PVWatts outputs a table of results with values for every month as well as an average for the year. If you don’t have anything backing up the solar system, then the only thing keeping the batteries charged are the solar panels.
You may notice that this is much lower than the ones used for sizing grid tied solar arrays.
It comes from properties of the deep cycle lead-acid batteries that are used in renewable energy applications.
As you drain a battery, the acid in each cell becomes less and less acidic, and its freezing point rises.
If they will be somewhere where it could reach 0 degrees or less and if they are discharged below 60% they will freeze and you will have to buy a whole new bank of batteries. Unlike in grid tied solar arrays, a battery-based inverter is physically providing the power for your electric loads.
A surge load occurs when starting an electric motor or pump, usually for air conditioning units, well pumps, or shop tools. Technically, we can say this but practically it has space requirement as good as Thin Films because when we are installing CPV, we must have dual axis tracking. The scheme pays existing participants with small-scale solar power systems of five kilowatts capacity or less a minimum credit of 25 cents per kilowatt hour for surplus electricity fed back into the grid. From the beginning of next year, the feed in tariff rate will be dramatically reduced to as little as 5c per kilowatt hour! We also advise to not just focus on the feed in tariff rate offered, but also other contract conditions as the devil can be in the detail.
Energy Matters’ extensive experience installing battery systems in Melbourne and across Victoria can assist you in choosing the right solution for your requirements. As premises and consumption profiles vary, your premises will require an assessment and any savings will vary according to your own circumstances (which may change over time).
The addition of an inverter allows this system to convert DC electrical current coming from the batteries into AC or alternating current. You need to ensure each component is properly sized for your specific energy needs and environmental conditions. For an entire house, there are a lot of things drawing power at once, a lot of calculations that need to be done to determine the total load. It is an excellent tool to use for finding your average daily electric load, and highly recommended for any battery based system sizing. At this point, you will need to know if you plan on using a source of back-up power in addition to the solar array.
Since the batteries are the critical component of any off-grid system, it is very important that their charge be maintained or you risk over cycling them, drawing them down too far, or otherwise overworking them so that they prematurely age and require replacement in 2-5 years rather than 10-15.


This is because of the addition of a battery bank and charge controller, and the differences in inverters between grid tied and off-grid systems.
With a grid tied solar array, there wouldn’t be any issues because the electric grid is there as the ultimate free battery bank. A complicated discussion on these properties could follow here, but suffice to say that the less you use batteries, the longer they last. A fully charged flooded battery might not freeze in 0 degree weather, but a fully discharged one most certainly will. For more information on battery banks and their maintenance, read “Extending Battery Life”. So, if you have 3000 watts of lights you need to run at once with your stand-alone system, you will need an off-grid inverter rated for 3000 watts or higher.
These surges can be 2-5 times higher than the continuous load, and the inverter has to have extra capacity to start it. Our online Calculator, Simple Sizing Chart or Solar Sizing Worksheet will provide you with Go Power! That being the case, any savings in your situation will likely to be different to any estimates shown. This will explore sizing a stand-alone solar system based on an average daily load in watt hours that will be calculated from your usage habits. A good way to keep track of everything in is to use Affordable Solar’s Off-Grid Load Estimator.
This distinction is important for sizing the three discrete components for a battery-based solar system.
Without something external to bail out the solar system when the days are short, you need to size the solar array for the absolute worst case scenario or you’ll find yourself without enough power in winter. Charge controllers will lose between 1-5% of the power that goes through them, more if they are not an MPPT controller.
However, since this is a stand-alone system, the batteries have to be sized to handle the possibility that there won’t be any other power available for days at a time. By setting an arbitrary point for when you stop draining batteries, you help preserve them and they will hold a charger for longer than if you fully discharge them. When sizing an inverter for your loads, it’s best to come up with a “worst case scenario” where the most appliances, lights, and other loads will be running at once.
Fortunately, most modern battery-based solar inverters have a “surge rating” for 1-10 seconds that is twice as high as their continuous rated output. The solar array and battery components are both sized based on the amount of energy that is required, while the inverter and power panel are sized based on the amount of power that will be used at once.
This is a very important question to ask, because it greatly affects the eventual size of the solar array. Winter is a challenging time for any battery-based solar system, for more tips on making it through read “Suriving Winter With a PV System”.
For most systems, a value of 2-3 days will cover almost all scenarios and give you a sufficiently large battery bank. It adds all of them and gives the number of watt-hours that need to be delivered every day by the system. If you are using a source of back-up power for your system, then you can size the solar array based on the average daily sun hours for the entire year just like a grid tied solar array. If you live somewhere with consistent cloud cover or long winters, however, you may want to design a larger battery bank to accommodate them, one that can deliver power for 4 days or longer. Most systems are designed to a 50% depth of discharge, which is enough to give you 7-10 years of life from your batteries.
If you will not have anything besides the solar array, you need to use the month that has the lowest value of sun hours for the year.
For more information on MPPT charge controllers and their benefits over conventional charge controllers, read “Maximum Power Point Tracking (MPPT) Charge Controllers”.



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