Dear Save Green Inc Solar Visitors,
Due to large amount of emails to Save Green Inc. asking “How many solar panels do i need for my home”. We work out an example to teach you how to calculate the figures if you want to order solar panels for yourself use.
We hope it helps. Buy Solar Panels from Save Green Inc – A trustworthy, professional solar technology supplier.
This is the process we followed, when calculating our home’s solar power needs and the investment required.
1 – How Much Power Do You Use Per Day?:
To do this, get your last 12 monthly power bills and calculate your average kilowatt hour (kWh) usage per month. The reason we use 12 is because our power consumption fluctuates with the seasons. The calculation would be to add up the power used over the past 12 months and divide it by 12. But if you do not have all your power bills, then simply use last month’s one.
Now take your average monthly usage and divide it by 30 to work out your average daily power consumption
- Let’s use an example: If our monthly energy usage is 800kWh, then the average daily power used is: 800/30 = 26.7 kWh a day.
- Now if you want to only halve your power bill then you need to produce 26.7 / 2 = 13.4 kWh of solar panel watt power per day.
2 – Calculate The Total Wattage Of Solar Power Needed:
Before you can work this out, you need to find out how many usable hours of sunlight your region gets per day. A simple way to find that out is to have a look at an insolation map – you could just google it to find one.
Now take the average daily kWh calculation and divide that by the number of daily usable sunlight hours, then multiply that by 1.25 (to take into account the wasted energy from wiring, charge controllers. batteries, and inverters).
- Continuing from our example: Our solar panel watt needs equal:
13.4 kWh needed / 5.5hrs of sunlight x 1.25 = 3.045 kW or 3045 Watts a day.
If you want to use 180watts solar panel,you will need 3045/180=17 piece 180watts monocrystalline solar panels.
This indicates that our home solar power system must have the minimum capacity to produce 3045 Watts of power.
3 – Calculate Solar Panel Watt Costs:
Next you need to work out how much it will cost to buy solar panels that produce at least 3045 Watts. Currently the highest average cost for solar panels in North America is $4.85 a Watt.
- Following on from our example, the solar panels will cost 3045 x 4.85 = $14,768 to only halve our monthly power costs. This excludes the cost of wiring, charge controllers, batteries, inverters, and installation fees.
4 – Take Government Rebates and Credits Into Account:
Before we jump the gun and think it will cost us at least $14,768 for 3045 Watts of solar panel watt power, we need to take tax incentives and rebates in account.
2011′s Federal renewable energy tax credits came into effect from the beginning of the year, and coupled with the state-side incentives in places like Connecticut, California, New York and New Jersey, the cost of the solar power system will be much less.
- Using the same example: For a Californian to buy the solar panels, they would receive a state tax rebate of 20% of the cost, and a federal tax subsidy of 40% of the remainder. So, the investment in the solar panels would only be:
$14,768 – $14,768 x (20%) – $14,768 x (1 – 20%) x 40% = $7,089.
Since there are many factors that go into calculating your solar panel watt costs, please only use our steps as a rough estimate. Some things were impossible for us to take into account, such as special offers by solar installation companies, where they offer you discounts on the full installation (including charge controller, inverter, battery, grid-tie electrician costs, etc).
But, from our example it would cost a Californian about $7089 to invest in solar panels that can reduce his electricity bill by only 50%. Shine Solar use very good quality raw materials(solar cells,EVA,junction box,connectors,solar glasses etc) to produce our solar paenls,so if you are looking for really good quality product for resell or selfuse,pls use Save Green Inc Solar Panel!
|
