If you are keenly interested in how to change your home to solar energy system and also curious in a grid(network of lines tied photovoltaic) system you need to calculate system size according to you energy needs. Also get knowledge of yours state as well as federal tax concessions and know how to source components.
Instructions and Information
First look out how much your electric consumption annually; take average of your electric consumption in KWH. After that you will get the result and then divide it with 150 (monthly hours) if you live near the coastal area, it can be 155, if you live in a mountains area then it can be 160. It will provide you a rough size of solar energy system. lets say for example if your monthly average monthly use was 450kWh per month and you were living near the coastal area then you will need a 3KW PV system to offset 100% of your consumption.
Establish and settle your incentive level. The New York Solar Initiatives provides incentives on state level. The incentives and concession level OR survey are different depending upon the use such as residential, commercial nonprofit or government entity (qualities and relations). The other states California and Texas are also having great discount in tax incentives. federal Government provide a 30% federal tax credit for you can get information from your accountant to check if you are eligible for the tax credit or not.
In many cases deductions in sum and tax credit both offset roughly 40 to 70 percent of the cost of the solar energy system installation, it will be more cost if you do the installation yourself in other words it will take more expenditure in the installation of this useful system. Commercial system are eligible for MACRS (Modified Accelerated Cost Recovery System), it’s also known as accelerated depreciation (allowance made in estimation). utility rates are different by location so there can not be any exact information for the payback . Anyhow it’s usually about 8 to 15 years if installed by the a contractor, it is a monthly finance and then compared this to your monthly electric bill.
For commercial user’s the payback can be from 3 to 6 years. There is another thing need to know is that when calculating payback is the estimation value of the system to your home/building, `insulation from future electric rate hikes, and when you to paid off the system installation, you have free electricity. In majority of cases the system will be worthily after the payment of all depreciations or tax credit. And today almost all modules are warranted for 20 to 25 years. There is necessary value of energy being produced from the sun heat instead of coal or natural gas and you will get fruitful return from your investment. For more information about that contact your local utility provider.
If your electric need is 3 KW, then it is required to find out the amount of modules and the right size of inverter. There are much places available on internet so can find all these information on internet before buying this requires system. Buy branded modules for example Sharp, Sun power and many other because these companies have been working since many years. And they have also warranties on their products.
You will pay a premium (sum additional to interest) If you need cheap modules for installation then you will search for companies who provided these utilities the companies are Sun tech and Canadian Solar they have best quality products. Most of manufacturers in the industry make modules it is a same product’s which are produced many other’s There is less different among their products. But you will search a good quality products because these companies provide less warranty you must take a clear step about to buy these products.
Grid tied inverter will be needed also for that SMA Unites States, SEIA and FSLR inventers are the standard industries. If you want to install all these by yourself then you will need an AC disconnect and DC disconnect properly sized according to the National Electric Code.Then you will also need to know about the size wire, conduits and connectors you will need to run from the modules to the DC disconnect , to the inverter, to the AC disconnect and to your main electrical service. You will also need racking and Standoff for that try Prosolar or Uniarc. prosolar is cheap than Uniarc. You will need an extra breaker also for your electrical panel.
After to collect all your materials which are used in the preparation of solar energy panels, then you will need to calculate your result then decide what type of modules and inverter you will need for, for this reason you will also need PV Watts V2 calculator using different quantities of the modules you are selecting until you obtain a KWh output which is roughly 90 to 100 % of your current consumption. Modules are rated in DC watts, so you will need to expect less result as subjected by the manufacturers because power is being change to AC before it reached your main service panel. A 210-watt modules will provide 198 watts after conversion and losses also.
There are local codes regarding to this installation. Which is enforced and proposed by the inspectors so should consult with an electrician. There are different locality so you will need all of these materials according to your needs. because some require fire borders around the modules while other may need extra double, triple grounding for your system. Talk to an inspector if possible at your city or country development department. May be he concerned department provide your a clear cut details and guidelines for your area. You will also need to know and should consult with your local utility provider “interconnection” or “net metering” department.
Department like these will provide you a great details and other useful information or guidelines about the entire process, and also forms online on the internet. You must meet these three entities such as local permitting agency second local utility and third your local rebate administrator. All will be having paperwork and guidelines that, if not stick with all of them, if not vigorous slow any building momentum. You must be prepared before meeting with all of them, review all your needs and have all question answers regarding to installation instead of that you will waste countless hours making corrections, paying for additional reviews and possibly get a less rebate (tax) than expected.
Taking all of these there ate so many differences to go over all the steps of how to size every different kinds of system for that to get a solar design book. For that “Solar Energy Magazine” is good source in which you will learn about all the concerned design and source of people who had installed their own system are published. And other related issues. here is a quick review of the things you should know: building permit requirements, inverter string size, wire and conduit sizing, building permit requirements, interconnection requirements, fire department requirements and building code requirements.
You should have to take first the rebate paperwork because is is a multi step process than other requirements. You should first reserve the rebate after that install the solar energy system and then claim the rebate. The rebate reservation will expire and become void if the system is not installed within a reasonable and moderate amount of time. Always make follow up call to ensure that the rebate paperwork arrived.