Sun City Solar Energy -Solar Power and Solar Panels http://www.suncityenergy.com Solar specialists since 1983 Thu, 17 Jul 2014 00:59:26 +0000 en-US hourly 1 http://wordpress.org/?v=3.9.1 Solar Power Battery Storage Big Winner http://www.suncityenergy.com/solar-power-battery-storage/ http://www.suncityenergy.com/solar-power-battery-storage/#comments Tue, 06 May 2014 13:01:06 +0000 http://www.suncityenergy.com/?p=5997 Consumers to be big winners in solar power battery storage Consumers are using solar powered battery storage at a much faster pace to look after their own needs and future electric pricing. This may very well result in a reduction in electricity prices for nearly all consumers and finally competition for the utilities. According to […]

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Consumers to be big winners in solar power battery storage

Consumers are using solar powered battery storage at a much faster pace to look after their own needs and future electric pricing. This may very well result in a reduction in electricity prices for nearly all consumers and finally competition for the utilities.

According to Giles Parkinson, this is the scenario being painted to the utilities industry by global consulting firm PwC, which says the sector is about to go an unprecedented and rapid transition as dramatic as that which affected other industries.

Sun City Solar Off Grid 300x194 Solar Power Battery Storage Big Winner

Off Grid

Electricity utilities, it says, are about to face their “Kodak moment” and the key is the emergence of rooftop solar, and its ability provide a cheap source of electricity, as well other “enabling” technologies such as solar power battery storage and smart software.

This, says Mark Coughlin, the power utilities leader for PwC, will fundamentally change the nature of the relationship between utility and the consumer. It will effectively shift the power from the utility to the customer, be they households or businesses, and will challenge the very “right to survive” of the traditional utility.

“This traditional utility model where the company controls the ‘electrons’ and the consumer has little choice is on its last legs – this model is struggling to meet customer needs,” Coughlin says.

“Once a household or a business has a solar panel on the roof or some other power source they are no longer a passive consumer.”

He says that customers are now emerging as competitors to the utilities. “In as little as the next five years consumers will exert unprecedented control over energy supply, usage, service standards and costs,” Coughlin told the Energy Networks Association conference last week.

Hence the emergence of rooftop solar, which is already cheaper than socket-power because it has no delivery costs, and which is starting to challenge some fossil fuel generation, such as rising gas costs, on generation price.

This, coupled with the emergence of battery and other storage technologies, smart meters, and other software that allows energy to be stored and delivered at lower cost on a smaller network, is challenging the traditional business model of the industry.

“Smart grids, smart meters and customer energy management ‘gadgets’ are only the beginning of what is possible,” PwC says in a new report Utility of the Future. Already we can control our home electronics and entertainment via our smart phones and tablets – why not our energy usage on a minute-by-minute basis?”

Coughlin says that these technologies – and new financing structures – will open the door to a flood of new entrants to the industry, be they telco, technology providers, financiers and systems managers, and existing utilities will also rush to form new alliances and joint ventures.

In data, this will include the likes of Google and Apple, in finance it will range from huge investors such as Warren Buffett and Macquarie Group. But PwC says it will also come from local sources. “We expect to see small crowd-funded energy companies emerge in Australia within the next three years,” it predicts.

“Customer energy contracts will greatly favor the customer – suppliers will have little choice in the matter!” the PwC report says, noting that changes to the way services are offered are likely to occur within three years.

“This will mark a major, transformational shift for both the utility sector and customers. “ And it will drive benefits to consumers. “In some cases this will see customers paying more for certainty of supply. In other cases we see the distinct possibility that costs will reduce for customers.”

PwC predicts that the retail market will turn into a “channel fight” focused on costs and choice. The retail sector could be subsumed into other large scale “retail engines” such as data providers and telcos, and other in house service providers. And there is likely to be a big turf war with the network distributor companies over who owns those assets.

“The key will be who has ownership and operational control of distributed generation assets – these will be the swing factor in who can provide the most innovative services for customers.”

Generators will struggle because of the combined impact of falling demand, and rival energy sources, such as rooftop solar. In Europe, nearly $500 billion has been wiped from the value of utility assets – primarily generators – as a result of the impact of new technologies.

“Contracting for long-term demand will become increasingly difficult as time passes given viable alternative sources of supply will almost certainly become available within 10 years,” PwC writes.

 

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Oklahoma Governor Fallin SB1456 http://www.suncityenergy.com/oklahoma-governor-fallin-sb1456/ http://www.suncityenergy.com/oklahoma-governor-fallin-sb1456/#comments Sat, 26 Apr 2014 18:07:30 +0000 http://www.suncityenergy.com/?p=5977 Oklahoma Governor Fallin SB1456 Executive Order Supports Solar Excerpts from Executive Order Governor Fallin signed on April 21,2014: All executive entities shall support all forms of energy, including both traditional fossil fuels and renewable energy sources like wind and solar power, as outlined and mandated by the Oklahoma First Energy Plan. This plan promotes wind […]

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Oklahoma Governor Fallin SB1456 Executive Order Supports Solar

Excerpts from Executive Order Governor Fallin signed on April 21,2014:

All executive entities shall support all forms of energy, including both traditional fossil fuels and renewable energy sources like wind and solar power, as outlined and mandated by the Oklahoma First Energy Plan. This plan promotes wind and solar as  important forms of clean energy which have a significant place in Oklahoma power generation. An essential element of this plan is distributed generation. Senate Bill 1456 must be construed in a manner consistent with the Oklahoma First energy Plan. 

Currently approximately 350 Oklahoma individuals and businesses rely on distributed generation produced by small wind turbines and solar power generators. While these customers will not be affected by this bill, this number will grow significantly in the future. This is an exciting development and one this bill encourages.

This bill requires the Corporation Commission to conduct a transparent evaluation of distributed generation consistent with the Oklahoma First Energy Plan. The intent of this bill is to protect all Oklahoma customers and encourage all forms of Oklahoma energy use.

Further, this evaluation mandates inclusion of all stakeholders, including representatives of the solar and wind industries and utilities. Prior to implementation of any fixed charges, this bill allows the commission to consider the use of all available alternatives, including other rate forms such as increased time of use rates, minimum bills and demand charges. A proper and required examination of these and other rate forms will ensure that Oklahoma appropriately implements the Oklahoma First Energy Plan while protecting future distributed generation customers.

Signed by Mary Fallin, Governor of Oklahoma

See Sun City Solar  on Channel 8 News! Oklahoma Utilities want to tax solar!

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Utilities Fight Against Solar Power http://www.suncityenergy.com/utilities-fight-against-solar-power/ http://www.suncityenergy.com/utilities-fight-against-solar-power/#comments Tue, 07 Jan 2014 16:13:14 +0000 http://www.suncityenergy.com/?p=5858 Utility Companies Fight against Solar The increased installation of residential and commercial solar power systems is causing concern among the nation’s utilities.  Utilities fear solar power may upset the traditional centralized model that has existed since the commercialization of electricity.  Through net metering, utility customers are able to drastically reduce or even entirely offset their […]

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Utility Companies Fight against Solar

The increased installation of residential and commercial solar power systems is causing concern among the nation’s utilities.  Utilities fear solar power may upset the traditional centralized model that has existed since the commercialization of electricity.  Through net metering, utility customers are able to drastically reduce or even entirely offset their electric bills using increasingly affordable solar power systems. As more customers choose to install solar power systems, utility revenue may decrease.  Utilities believe fewer customers will share the divided costs of grid operation and maintenance. However, solar power benefits are not considered by some utilities:

  •  Relieves strain on transmission lines especially during heavy usage in hot summer months or very cold  winters eliminating black outs and power outages
  •  Reduces transmission & distribution costs for maintenance
  • Avoids cost by delaying construction of conventional generation plants
  •  Improves reliability by increasing generation diversity

As the cost of a solar power system plummets, the number of solar power installations  increase. Since 2008 the cost of a PV module has decreased by 80%. In 2013, 30 percent more solar power systems were installed than in 2012.  A 2010 World Energy Council report predicts that in 2100, 70 percent of world energy production may come from solar energy (World Energy Council, 2010). The rapid increase in solar energy deployment threatens electric utilities’ reliance on centralized fossil fuel power plants; Graph shows utility installs in US 300x252 Utilities Fight Against Solar Powerutilities install more solar than commercial or residential customers.

In grid-connected solar power systems, excess power is provided to the grid in a process known as net metering.  In net-metered systems, utilities credit the solar system owner for surplus electric generation the solar power system feeds into the grid. The credit is applied against the power the customer consumes from the grid when the PV system is unable to meet the customer’s electrical demand.  Utility customers pay only for the “net” power they consume from the utility.  As a result of net metering, it is possible for a utility customer to consume grid power while paying the utility little to nothing. Under the Energy Policy Act of 2005, all public utilities are required by law to provide net metering to customers upon request (SEIA, 2013). Currently net metering policies are active in 43 states.

As utility power rates continue to increase and the cost of solar power systems continues to decrease, the cost of solar power will eventually equal the cost of grid power, and even become less expensive. Utilities rely on a top-down business model where power is produced at few, large, centralized power plants and dispersed to grid customers. This traditional model is under threat as the feasibility of power production from numerous solar power systems increases and awareness of the fragility and outdated nature of our existing distribution network is exposed by natural disasters like hurricane Sandy,  Richard Caperton of the Center for American Progress outlines a worst-case scenario he calls the “Utility Death Spiral” in which a feedback loop is established where as more customers install solar power, the cost of being grid connected increases, encouraging more ratepayers to leave the grid (Caperton, 2013).  At Sun City Solar Energy, installations of off grid and grid tie with battery backup increase substantially each year.

The writing is on the wall for US electric companies and they are well aware of the deep penetration solar has had on some other grids (see: Germany).  It is not that utilities are ‘evil’ – in fact if you were to ask any one employee of almost any utility what they thought of solar, their response would almost certainly be positive;  Sun City Solar has installed several systems on employees of utility companies. The utilities whose company culture can keep pace with the ideals of their individuals (and match the expansion of distributed generation) are well suited to participate in the evolving grid through transmission and distribution management. The organizations which can’t respond will most likely suffer the same fate as the record labels that ignored the growth of the Web.

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Why You Must Install Solar http://www.suncityenergy.com/must-install-solar/ http://www.suncityenergy.com/must-install-solar/#comments Tue, 24 Sep 2013 16:09:36 +0000 http://www.suncityenergy.com/?p=5833 Right now is the best time to install solar on your home or building. Why? Technology, efficiency advances and much lower prices. Prices are lower but waiting has some risks. Below are reasons you must install solar now.  1. Increased efficiency, production and lower cost: Solar panels are being produced cheaper than ever. The cost of […]

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Right now is the best time to install solar on your home or building. Why? Technology, efficiency advances and much lower prices. Prices are lower but waiting has some risks. Below are reasons you must install solar now.

 1. Increased efficiency, production and lower cost: Solar panels are being produced cheaper than ever. The cost of a solar panel has fallen from more than $6 to $2.00 a watt. Prices today are less than half of what they were in 2008 and 2009. Solar Power users pay less over time and you own your power.

This chart shows how much your electricity rates increased from July of 2012 to July of 2013.

Residential Cents per kilowatt hour July 2013 July 2012
Oklahoma 9.80 9.05
Arkansas 9.94 9.62
Texas 11.42 10.93
Missouri 12.48 11.23 

2. Solar Power is Cheaper than Grid Power: Grid power is expected to increase a minimum of 3% per year. That means in 25 years your electric rate will be $0.21 per kWh. The cost of solar energy spread over 25 years is $0.16 per kWh BEFORE any federal or state incentives.

 3. Become Your Own Utility have Energy Price Stability:  Utility companies are under constant pressure to make more money. They can’t add new services; they can only make and send you energy and raise their rates. Installing solar power is the only way a homeowner can lock-in their electric rate for the next 40 years, inflation free.  When you install solar power on your home or business, you know how much electricity your system will produce annually. As energy prices skyrocket all around you, you can forecast energy prices for the years to come.  And with net metering, you can actually make money.

4. Be Energy Independent:  Most electricity in the United States is produced by coal. Solar Power is the only energy source made by Americans that isn’t affected by events in other countries.

 5. Dependability: Solar power has no moving parts. The warranty for power produced from the panels is 25 years. The inverter warranty is 15-25 years, but is expected to last longer. 

6. Earn Income: You can get a credit on your electric bill for over producing more solar than you use. This is completely separate from your energy savings. 

7. Solar Employs Americans: The US solar industry employs 120,000 people directly and another 9 million people indirectly. This recently surpassed the coal industry which employs 90,000 people directly and 1 Million in-directly. 

8. Solar Cannot Be Controlled by Government Agencies or Large Corporations: Once you install a solar electric system, the cost of energy from that system cannot be increased by government taxes, or corporate surcharges. You have protected your energy future from outside interference.

9. Incentives and tax breaks: The solar federal tax credit takes 30% off the total cost of your system.

10. Solar is Clean: Most Americans don’t like waste. We like efficiency, and we like getting things done, making things. We prefer a clean, efficient, and effective source of power over something that is wasteful, dirty and inefficient. Solar power produces energy every day without making any noise, without any smell, and without wasting power in transmission. It’s the ultimate American form of power.

11. Increase Building Value:  Whether it’s a home or business, solar installations increase a building’s value.CNN Money reported in 2006 that zeroing out a home’s electric bill with a solar installation could increase the value of a home by up to $20,000. This might be as much as you first paid for your system, but when considering how much you saved in electricity bills while using the solar system and how much it added value to your home at sales time, it’s a sound investment. And the DOE in its publication, A Homebuilder’s Guide to Going Solar says that “Solar homes sell at up to twice the rate of their conventional counterparts”.

12. Energy Reliability :  When you choose to install a solar power system with a battery backup,  solar provides absolute electric reliability, no more blackouts or brownouts when the grid fails. By installing a solar power system you have reliable, predictable power, no matter what happens.

 

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Solar Panel Longevity http://www.suncityenergy.com/solar-panel-longevity/ http://www.suncityenergy.com/solar-panel-longevity/#comments Tue, 07 May 2013 14:27:33 +0000 http://www.suncityenergy.com/?p=5743 Most panels are warranted to be producing a MINIMUM of 80% of their original power in 25 years.  The panel is not going to to turn off at the 25 year mark. Many factors affect solar panel longevity. Many of the early solar panels made back in the 1970s are still running at 80% of […]

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Most panels are warranted to be producing a MINIMUM of 80% of their original power in 25 years.

Sun City Solar Pergola Install1 225x300 Solar Panel Longevity The panel is not going to to turn off at the 25 year mark. Many factors affect solar panel longevity. Many of the early solar panels made back in the 1970s are still running at 80% of their original power capacity. After 40 years, they are producing power well past their predicted useful life, these old panels are still operating efficiently.

The regular warranty for most photovoltaic solar panels is 25 -30 years. Here is how the manufacturers come up with this number: They calculate a loss of efficiency of .8% for every year. At this rate of degradation, after 25 years, the panels will be operating at 80% of their original efficiency. Solar panels should meet a minimum 80% efficiency standard, in order to be effective. Therefore 25 years is the time predicted for these panels to degrade below an 80% efficiency rate.

The Good News, there are crystalline panels that have been running for over 40 years.

What can you do to increase your solar panel longevity?

Solar panels don’t require heavy maintenance. Here are some simple steps you can take to keep them functioning at full capacity for a longer period of time than usual.

  • Pick a manufacturer with a good reputation. For the most part, solar panels are encapsulated in low iron tempered glass and unaffected by the environment. The semiconductor material is isolated from the corrosive atmosphere. If a manufacturer uses sub-standard materials to encapsulate the metal and conductive materials, the panel will degrade.
  • Make sure they have full access to light. Remove any tree limbs or other plant growth that block sunlight. Any shade will have a negative impact on a solar panel’s efficiency – but not just because of blocked photons. The shaded area will be a high-resistance“hotspot”, even, to some degree, with diodes installed. These hotspots can accelerate degradation of the module over time and lead to premature failure.
  • Be sure to keep your solar panels clean. This is doubly true in areas with lots of wind. Keep your panels free of dust, dirt, sand and pollen. In more polluted cities, don’t let smog settle on the panels. In winter, keep snow and frost off the panels when possible.

At Sun City Solar, we find you the “Best Panel at the Best Price”. Give us a call.

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Solar Power Provides Electric Credit http://www.suncityenergy.com/solar-provides-electric-credit/ http://www.suncityenergy.com/solar-provides-electric-credit/#comments Wed, 10 Apr 2013 14:40:02 +0000 http://www.suncityenergy.com/?p=5710 Solar Power Provides Electric Credit Would you like to have a credit on your electric bill instead of a balance due? Solar power is now more affordable than ever and  provides relief from the high summer electric bills we are all used to paying no matter how much they are.  Why continue to send  checks […]

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Solar Power Provides Electric Credit

Would you like to have a credit on your electric bill instead of a balance due? Solar power is now more affordable than ever and  provides relief from the high summer electric bills we are all used to paying no matter how much they are.  Why continue to send  checks to your electric company when today you have a cost effective alternative. Plus, you have a home improvement which adds to your appraisal  and your home is more marketable with low or zero bills. Here is what our customer just wrote us; This could be you!

Tuesday, April 09, 2013 8:50 AM
Subject: My First $0 Empire Electric Bill

Sun City Solar,

Just a brief note to let you know I received my Empire Electric Bill for
March. It was $0 with -271 credits! Sure we have natural gas central heating
so that helps, but I have been monitoring our electric use and knew it was
likely to be very good, but this just confirms it.

Two weeks ago Empire sent an employee out to read our meters and look
everything over. My wife Debra spoke with him and he said they just wanted
to check the accuracy of the new meters and he then left.

A zero Electric bill is quite a rush. I know soon with air conditioning
season approaching things will be different, but still…

Again thanks to you and your crew and I look forward to having fun
monitoring my Sun City Solar Energy installed system.

Doug

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The Power of Distributed Solar http://www.suncityenergy.com/distributed-solar-power/ http://www.suncityenergy.com/distributed-solar-power/#comments Tue, 29 Jan 2013 15:51:18 +0000 http://www.suncityenergy.com/?p=5607 Distributed Solar Power Remember when we relied on Mainframe computers with outlying workstations?  A computer could not process information on its own.  Today, we rely on small portable laptops, I-phones, I-pads and other electronic devices for information, giving us independence and mobility. Just as smaller sized computers enable independence, the same is now true for […]

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Distributed Solar Power

Remember when we relied on Mainframe computers with outlying workstations?  A computer could not process information on its own.  Today, we rely on small portable laptops, I-phones, I-pads and other electronic devices for information, giving us independence and mobility.

Just as smaller sized computers enable independence, the same is now true for electricity.

Distributed energy refers to small modular power generating systems. Power is “distributed” and

russell batteries1 150x150 The Power of Distributed Solar

Solar Power Battery System

“decentralized” because it is placed at or near the point of energy consumption.  Distributed energy is unlike traditional “centralized” power systems where electricity is generated at a remote large scale power plant and then transmitted through power lines to consumers.

Most of us have experienced power outages and know the unreliability of our current “centralized/transmitted power structure. With distributed energy, the quality and reliability of our electric supply is improved.  Homeowners and businesses can implement distributed energy simply by installing a small solar powered on-site battery system.  Solar Power battery systems provide both emergency backup and remote power.

Generators are the most common distributed energy technology in use today for stand-by power. However, generators create significant pollution and noise. Those who used generators during the recent power outages can attest that generators all also very expensive to operate.

There are many benefits to distributed decentralized energy including having a very important role in our nation’s energy portfolio and strengthening America’s energy security.

Grid-connected distributed solar power can and is being used to meet the peak demands of current “centralized” power systems.  These systems can be used to meet traditional base load power and peak demand power in hot summer months. Grid-connected solar adds greater stability to the electric grid, decreases transmission and distribution maintenance costs and reduces the need to construct more nuclear, gas or coal fired power plants.

Solar power can provide power when and where it is needed. Distributed solar power systems are modular and flexible. Solar Power is quiet and non- polluting. Now more than ever, Americans have a choice on where their power comes from; a choice to be independent and have a reliable clean quiet source of power at their location.  Every day, one customer at a time, Sun City Solar Energy empowers Americans a little closer to decentralized energy independence.

 

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Solar Power Testimonial-Making Dreams a Reality http://www.suncityenergy.com/solar-power-testimonial/ http://www.suncityenergy.com/solar-power-testimonial/#comments Tue, 31 Jul 2012 15:44:48 +0000 http://www.suncityenergy.com/?p=5244 Thank you so much for making our dreams of solar a reality. This whole experience with your company, from start to finish, has been wonderful. We felt so taken care of with you and your communications and updates as we moved through the process. This meant a lot to us. It was really fun to […]

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Thank you so much for making our dreams of solar a reality. This whole experience with your company, from start to finish, has been wonderful. We felt so taken care of with you and your communications and updates as we moved through the process. This meant a lot to us.

It was really fun to have you, Garrett, Steve, and Pete here on our property in the mountains. You all have a work ethic that is hard to beat.

We truly are on cloud nine with our solar setup. It feels so good to be able to be comfortable, play music, have lights on when we want and need them- and to know that it all comes from the sun!

We are thankful to have made some new friends and be a part of the Sun City Solar family. We would love to be a part of your reference network to let others know about our great experience with Sun City Solar.

Sincerely,
Lucie Forbes
Rod Nyberg
Eureka Springs, AR
Off Grid Solar Power System
July 28, 2012

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Understanding Solar Panel Power Ratings http://www.suncityenergy.com/solarpanelratings/ http://www.suncityenergy.com/solarpanelratings/#comments Wed, 25 Jul 2012 14:16:01 +0000 http://www.suncityenergy.com/?p=5236 Understanding solar panel data sheets and module direction are important factors to consider when investing in solar power. When shopping for a solar electric power system for your home or business, insist on a system PTC rating . A PTC rating is the efficiency rating of the module in real world conditions not in the […]

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Understanding solar panel data sheets and module direction are important factors to consider when investing in solar power. When shopping for a solar electric power system for your home or business, insist on a system PTC rating . A PTC rating is the efficiency rating of the module in real world conditions not in the factory. STC rated kilowatt-hours per day are not real condition numbers.  When comparing various solar electric applications, be sure you are comparing apples to apples.

STC in an acronym for “Factory Standard Test Conditions,” which is 1,000 watts per square meter solar irradiance, 1.5 Air Mass and 77 degrees Fahrenheit cell temperature. PTC is an acronym for “Photo Voltaic USA Test Conditions,” which were developed at the PV USA test site at the University of California Davis. The PTC rating represents a more real life condition of 1,000 watts per square meter solar irradiance, 1.5 Air Mass, 68 degrees Fahrenheit ambient temperature at 33 feet above ground level and wind speed of 1 meter per second.

The ambient temperature rating is a better standard than factory conditions because silicon solar cells average about 68 degrees above ambient temperature in the real world.  Cell voltage drops as temperature increases. A module’s power output in real life conditions is lower than the power measured at the factory where cell temperature is maintained at a controlled 77 degrees.

Cell voltage drops about 0.08 volts per degree Centigrade in environments that exceed 77 degrees Fahrenheit. Thus, an STC rating of 17 volts can actually become a PTC rating of 15 or 16 volts. Using Ohm’s Law, volts times amps is equal to watts, which equals power, so a reduced voltage means reduced watts.

 Solar Module Compass Direction

The amount of sun shining on the module will be determined based on the direction the system is facing. As the sun moves across the sky throughout the day, from the East in the morning to the West in the afternoon, the compass direction (orientation to the South, Southwest, East, etc.) of the module affects the cumulative energy output.

For this reason, maximum efficiency is gained when panels are installed facing south.  If the module is facing East or West, it will be exposed to less direct sunlight as the sun moves across the sky. There is no loss factor for south facing modules. For example, a southwest-facing module estimated energy output would be reduced by approximately 3%.

Below are several solar panel ratings that you should understand so you know what you are getting when you invest in a solar power system. Understanding and inquiring about solar panel ratings will ensure that you get the most out of your solar system.

Increasing Module Temperature Decreases Power (Temperature Factor)

Module operating temperature increases when placed in the sun. As the operating temperature increases, the power output decreases due to the properties of the conversion material.  Reduction of power output is true for all solar modules. The PV USA Test Condition (PTC) ratings take power reduction into consideration to a limited degree by calculating the PTC ratings based primarily on the specific module temperature characteristics. The PTC ratings are different for each module, and typically vary from approximately 87%-92% of the STC rating. A typical decrease in power output is approximately 12% for crystalline-based solar modules.  This decrease results in an STC rated 100 Watt DC solar module being PTC rated at approximately 88 Watts DC.

Minimum Warranted Power

 Minimum Warranted Power is a manufacturer rating. Essentially, manufacturers will guarantee that their panel’s actual power rating will not be less than a specified amount coming out of the box. This may have several names including peak tolerance rating, minimum warranted power, and negative tolerance rating. Regardless of the name, this means that a 200-Watt solar panel, with a negative tolerance rating of 10% (or a minimum power rating of 90%) is only warranted for 180 Watts out of the box.

Remember to look for the highest minimum warranted power rating and/or the lowest negative tolerance rating. Both are saying the same thing with different numbers.

STC vs. PTC Rating

 California and many other states require solar panel manufacturers to submit operating specifications for their products. These products are then further tested by an independent laboratory. In California, the agency approved to do this is PV USA. The results of PV USA tests are referred to as a panel’s PTC rating (PV USA Test Conditions). Therefore every panel will have both an STC rating (standard test conditions) and PTC rating. The PTC rating involves more extreme, real world test conditions, so you’ll find it to be lower than the STC rating and more accurate of how a solar panel will hold up. So the higher PTC rating, the better the panel.

Also, the state uses the PTC rating to calculate system rebates (i.e., expected performance). So if the STC rating for a panel is 175 Watts, and the PTC rating is only 160 Watts, the PTC rating of 160 will be the benchmark for your cash rebates — an important tip when figuring expenses and payback period for your solar system.

Efficiency Ratings

 This is the rating we’re all familiar with and the one that gets so much attention these days as solar panel developers and researchers struggle to create the highest efficiency solar panels. Efficiency rating is vital because the higher the efficiency, the more power you’ll get per square inch of panel surface. In other words, the higher the rating the less area you’ll have to use to achieve the same amount of power production. Be sure to review the factory printed specification sheet that lists solar module efficiency (not simply solar cell efficiency), along with the PTC and STC ratings described above.

At Sun City Solar Energy, we constantly research the solar panel market to offer our customers the highest producing modules available.  You can be assured that our products meet or exceed your expectations.

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Solar Grid Tie Battery Backup Converted to Off Grid http://www.suncityenergy.com/solar-grid-tie-battery-backup-converted-to-off-grid/ http://www.suncityenergy.com/solar-grid-tie-battery-backup-converted-to-off-grid/#comments Sat, 28 Apr 2012 16:42:42 +0000 http://www.suncityenergy.com/?p=5173 Fifty solar panels make this Ranch in Oklahoma energy independent. While this Sun City Solar  project began as a Solar Grid-Tie with Battery Backup, the customer decided Solar Off-Grid was the way to go. This solar system runs the Ranch home as well as a 1,200 square foot underground shelter with kitchen, bathroom and more. […]

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Russell Ranch Off Grid 300x178 Solar Grid Tie Battery Backup Converted to Off Grid Fifty solar panels make this Ranch in Oklahoma energy independent. While this Sun City Solar  project began as a Solar Grid-Tie with Battery Backup, the customer decided Solar Off-Grid was the way to go.

This solar system runs the Ranch home as well as a 1,200 square foot underground shelter with kitchen, bathroom and more. russell off grid 2 systems 300x193 Solar Grid Tie Battery Backup Converted to Off Grid

 

 

Solar panels are installed on the barn and the home with 11.5 KWh of power, six charge controllers,  four inverters and 36 AGM Rolls batteries.

In addition to this system, this Sun City Solar Energy repeat customer has installed solar on two other homes.  Both homes boast Grid-Tie with Battery- backup and PV Powered Solar Hot Water.

PV Powered Solar Hot Water will be installed on this Ranch as well.

When you are ready to be energy independent, give Sun City Solar a call and never have an electric bill again!

 

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