Tag Archive | "inverter"

Buying and Maintaining a Solar Electric PV System

PV Solar has the ability to make a positive impact on you and your home and your family in many ways.  But, there are some key components to buying and then keeping up your solar system that everyone should understand.

As we have talked about in previous articles, you want to receive several bids from several different solar contractors in your area before deciding on one.  This is going to be an expensive purchase, and one that is a long term investment, so take your time with this phase of the decision making.

You should seek a contractor who details the warranty and maintainence schedule on the proposal prior to making any final decisions.  Specifically, you want to make sure your contractor will be there to fix any problems that arise with the installation of the solar panels or the inverter or any other parts of the solar electric system.  A properly installed solar electric system should have very little maintaining needed, in fact, many owners of solar electric systems can go over ten years without needing to do a single thing to their properly installed system!

As for warranty information, be sure to figure out exactly what the warranty information is going to be on the solar panels and the inverter and any mounting gear that is part of the solar electric system.  Most solar panel makers offer a 20 year warranty, and usually the minimum warranty for solar electric inverters is 10 years, so make sure your contractor explains that to you.  Just so you understand as well, most local solar contractors have partnerships with local or national wholesalers of solar equipment.  They may even call themselves “authorized dealers” of certain types of solar electric equipment.  With this potentially being the case, they will know exactly the warranty information on the solar electric equipment.  If they do not know the warranty information, that might be a GREAT sign that you are dealing with an inexperienced “solar professional” and my advice would be to seek other options for your needs.

How to clean your Solar Electric System:

This is something that is simple. Usually, the rain will take care of all needed cleaning of the solar system, so you don’t need to worry about doing anything yourself.  Actually, in most cases, homeowners who try to get ontop of their roofs to “clean” their solar panels often cause more damage than good to the panels, so it is advised not to do much cleaning other than making it rain.

Another related article is about buying a 3 to 4 kw solar system

Posted in Buying SolarComments (1)

Solar is a longterm plan right?

Is Solar the Right Thing to Do, quick answer is yes.

But, this is a rather loaded question.

After being involved in the residential solar energy field for quite some time now, I thought it would be beneficial for me to put together some information for the typical homeowner who is considering going solar.

There are many different things to think about before getting a solar professional involved ( they are sometimes referred to as “installers”).

Here is the first question everyone should ask themselves: why am I looking into solar right now, what are my reasons for wanting solar power?

Once you have asked yourself that, and come up with some answers that are true answers, you can begin to find out if solar is a good idea for you.

Let us get right to the point,
in the hundreds of interested homeowners I have talked to over the year, everyone wants to know what the investment in solar looks like. Before breaking into other points about solar, let us address the costs and returns you can expect from a solar system.

Please realize that if you are the type of person who is currently having a hard time paying your electric bills, car payments, mortgage etc… solar is probably not going to be possible until you have some more disposable cash. Systems usually run between $20,000-$40,000 prior to any incentives. After incentives, the systems can cost quite a bit less, but you are still going to need to find many a thousand of dollars.

If you are still with us here, let me tell you some of the bright points of solar. It lasts a very very long time, systems should be on your roof working well for over 25 years. That is one of the most important things to realize, they will be with you longer than most of your neighbors!

What Size Solar System is right for you? It depends on what percentage of your electric bill you want to have covered by solar.
Also, it depends on how much available space you have, you may want to cover all your electricity with solar, but if you only have enough space to cover half, then there you are… For the purpose of getting you on your way to understanding a solar system’s size, I will assume that you have good access to the southern skies, and no shading from trees or other buildings.
Here is the math:
take the total number of kilo watt hours you purchased from the utility company the past twelve months. That number will be your kwh annual total. Next take that number and divide it by 12 to get your monthly average.

Next, take that number and divide it by 30 to get your daily average.
So this number is the number of kwh’s that the solar system would need to produce on average per day per year to meet your 100% needs.
At this point to figure out exactly the size system you need, we would need to know your location on the planet, as that will dictate how many sunlight hours you receive on average per day per year. This number is between 3.5 to 7 depending on where you are in the country. These hours are hours that the solar panels can operate at optimal efficiency, you may think you have 15 hours of sunlight some days of the year, and you do, but all sunlight hours are not created equal. For example, when the sun is coming up in the morning, it does not operate the panels at 100% efficiency. Take weather changes, clouds, and seasonal differences, and you will be between 3.5-7.

Back to the math,
to get the system size you need, take your daily total kwh use and divide by average daily sunlight hours. That will end up being the output the Solar System will need to have per hour in AC (Alternating Current) per hour to meet your 100% electric needs. Since Solar Systems are in DC (Direct Current) you should multiply the number you just got by 1.2 to bring your system size to a DC number. This is the system size you would need to meet your electric needs. What would something like that cost? Well, right now, the national average for residential Solar System installations (grid tied PV systems) is just about $7.00 per watt prior to incentives. That would mean that if you came up with a number of 6 from the math above, that would equal 6000 watts, and when multiplied by $7/watt you are at about $42,000 for that size system after shipping and installation.

Because the initial investment in Solar Power Systems can be expensive, it is feasible to think about the ways in which the costs can be reduced. If a person is technically oriented or very good at home improvement, it is possible that they might consider building their own solar system. The amount of electricity or heat that can be generated is directly influenced by the wattage of the solar panels, as well as by the intensity of the sun light that touches their surface. First, of course, it would be important to learn how solar panels work, what materials are required, the cost of the raw materials and the availability of them, and finally the difficulty involved in assembling and installing them. In the long run, will your effort be rewarded with a solar system that will serve you for a reasonable period of time?

Posted in Saving MoneyComments (3)