This is the third and final part of the “Sizing Your Solar Energy Panels” series. Have you done some calculations for your future solar power system yet? If you have been doing those mini exercises, you’ll most likely find a suitable solar panel for your home by now.

The next step requires us to find an appropriate-sized battery bank, inverter and charge controller. Let’s look at each of these:

1. The Inverter

The inverter you choose has to be sized according to the demands of the alternating current (AC) side of the circuit. Therefore you will choose a specification according to the loads in your house (with a little buffer in case you increase your loads over time). Pretty straightforward.

2. The Charge Controller

You’ll at least need a basic charge controller to begin with. Until you get fussy about how advanced you want this component to be, more affordable models will do just fine. You’ll need to get a specification that fits the output current (Amps) of your solar panel arrays. If you intend to scale up your solar power generator, you’ll do better with a larger charge controller with room to accommodate more solar panels than with two smaller-sized ones.

3. The Battery Bank

The size of your battery bank depends on how you want to use your solar panels. You can size your battery banks such that it can get you through thick clouds that pass by, or you can size them so you can get through three solid days of solar eclipse and a power outage at the same time. It really depends on you. But take note that over-sizing isn’t always realistic. You have to take into consideration the space they occupy and the how much they’ll cost you.

If your home is grid-tied, provided there aren’t frequent power outages, the size of your battery bank isn’t critical. Just size it to take care of cloudy days will do. You can still maintain your lifestyle by drawing power from the grid.

When you design your battery bank, you’ll have less power loss (through wires) if the voltage is higher. If you are able to design a 48-volt system, you can conserve more power than when you use a 24-volt or 12-volt system.

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There are obviously costs involved in setting up residential solar panels. Today, we’re going to look at these and balance them up with the financial gains you’ll experience. It’s a busy day, so let’s get right in:

Cost #1: Equipment.

Equipment forms the largest part of the entire solar power setup. These are PV panels, inverters, battery bank, regulators, et cetera. Equipment cost can be spread out over time if you want to expand your solar power generator over time. Perhaps your goal is to be able to build up one more solar panel every weekend. Thus your cost really spreads out over time. It can really be less taxing on your wallet this way.

Cost #2: Installation

If you want to do the installation yourself, you won’t have to worry about this cost. But if you want to get a professional or contractor to do it for you, remember o budget for this as well.

Cost #3: Interest

If you took up a loan to pay for your PV panels and other photovoltaic components, the interest is going to build up and this must be factored into the overall cost as well.

Cost #4: Permits, Fees and Taxes

In some locations, you’ll need to pay for permits and fees when you install solar panels over your roof or on your property. Generally, most states let you install solar panels without imposing taxes on them. But be sure to check with your local authorities so you know if you need to pay for any taxes.

Cost #5: Clearing Refuse

If you need someone to clear out any refuse for you, you may need to pay for their service.

Now these are all costs…how about the benefits, I hear you ask. Well, here are the financial gains you’ll enjoy:

Benefit #1: Lower Energy Bills

The most obvious benefit is the reduced (or eliminated) electricity bills. If you are adding solar panels gradually to your collection of “solar harvesters”, your energy bills will gradually reduce and may finally be eliminated.

Benefit #2: Hedge Against The Rising Cost of Energy

The cost of energy is set to rise as inflation and scarcity forces its price upward over the long term. We all experience this effect — everything seems to get more expensive! Yet when you’re tapping energy from the sun, it doesn’t get more expensive then when you first bought the photovoltaic equipment. Therefore while the rest of the world pays for electricity through their nose, you can quietly enjoy cheap electricity using solar panels.

Benefit #3: Appreciation

The price of your property will probably appreciate because you installed an asset. Depending on the valuation, you may get back what you paid for. This mean you’re really using all the energy for free through the years. If you built your own residential solar panels, you’re definitely going to get back more than you invested in equipment and other photovoltaic components.

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Why do people want to buy a used solar panel? The answer is obvious. Consumers choose to use solar energy for two main reasons – to cut down on energy bills and to preserve the environment. Therefore they want to spend the least money on the panel that gives them the most power output. The best candidates for this criteria are pre-owned photovoltaic panels. It is also environmentally friendly to reuse (or recycle) photovoltaic panels as much as possible.

Pre-owned solar power generators maintain up to 90% of their efficiency as when they were new. This is true even though the panels may be more than 10 years old. This often means you’ll get more wattage output for a lower price tag.

The only disadvantage is that new panels have better aesthetics, are lighter and take up less space. This is due to improved product design and better materials used. Also, the lifespan of used solar panels will obviously not be as long as brand new ones.

Pre-owned panels can be bought on eBay or from an agent. The source of these panels comes mainly from corporations that want to replace their panels with newer, more efficient ones. Others come from residential buildings. Whatever the source is, you’ll have to perform simple checks to make sure you’re not buying a lemon.

Most importantly, you need to be convinced that the used panel you buy is worth the price you pay for. Having this in mind, the cost per watt (for a used panel) has to be at least 20 to 30 per cent cheaper than brand new panels. Otherwise you’ve paid too much. This is a helpful guideline that can help you differentiate between the good buys and the bad ones.

You’ll also need to visually inspect them to see if there are any loose connections or rusted parts that need to be replaced. Remember to check the bypass diode as they are frequently burnt. This is often the reason photovoltaic panels are discarded. Simple faults like this can be immediately rectified with new components and a simple soldering iron.

While shopping, you may also have observed that some used solar cells have turned brown. This is because older cells contain a plastic substrate that becomes tinted after years of exposure to sunlight. However, electricity output is in no way reduced because of this.

If you want to buy used solar panels, the tips above can help you save a lot of money by buying the right panel that can serve you for years.

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As you shop around for solar energy panels, there may perhaps be that occasional doubt about its benefits. Many consumers have similar experience. At some point in time, they take the leap of faith to supplement their household energy requirement with solar energy. As a result, their utility bills decreased dramatically. Most are delighted to sell their extra supply of electricity back to the grid.

As energy cost increase over the last decade, more and more homes are installing solar panels on their property. Although it takes some upfront investment to own solar panels, they really pay for themselves after some time.

Theoretically, it takes about 12 years for you to make back your investment in solar panels. But many states are now offering rebates, so the final cost of your investment is really much lesser than it seems to be. Rebates vary from state to state, so be sure to check out what you’re entitled for. The government also offers other incentives to encourage you to use renewable energy for your home.

Over the past 30 years, the price of solar panels have fallen to only 10% of what it used to be. It was practically impossible for folks to get a good return on their investment in the past without very high solar exposure on their property.

However, solar panels are much more efficient than they used to be. Therefore they also generate much more power than before and they need minimal maintenance. Best of all, these maintenance can be done by yourself with very little time. Modern solar cells are also much lighter and compact. Thus they can be installed on your roof with little modifications to its structure. As solar cells become more reasonably priced, adding solar power to your home is a brilliant, long-term solution to expensive utility bills.

But before you go shopping for a solar energy panel, there are a few basics you need to find out. These will help determine what types of solar energy panels you’ll require:

1. Know Your Energy Consumption. You need to know how much power you consume – the average, the highs and lows. This information helps you size up your system so you can figure out how many panels you need and what design is most suitable for you.

2. Find Out How Many Sun Hours You Receive At Your Location. This is obvious, but even the most efficient photovoltaic panels cannot generate enough power if there is insufficient sunlight. It would be impractical and costly to pay for gigantic solar energy systems that produce trickles of power.

3. Decide Whether You’ll Be Going Off-Grid. On-grid and off-grid systems have their own advantages and disadvantages. Most homes will stay on the grid because they can tap extra power (especially during winters) when they need to and when they generate additional power, they can sell it back to the grid. If you’re located in a remote region, going off-grid may be practical. You’ll thus need a storage system such as a battery bank to store energy so you can use during the night.

4. Find Out The Rebates And Incentives Available To You In Your State. This is important as it helps you find out the true cost of your solar generator. This may be an important factor that helps you decide if using solar energy is worth it after all.

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In general, there are 3 major types of solar panels – portable, residential and commercial solar panel systems.

Portable solar panels are very small products that can supply low voltages (and limited power) to handheld or portable gadgets. There are rollable solar chargers, foldable solar panels and small, thin-film panels. The type of solar panel to be used depends on your application.

Residential and commercial solar panels are made using either crystalline silicon, thin-film or string-ribbon technology. They are much larger than portable solar panels and require inverters to convert direct current to alternating current. This conforms the electricity supply to the requirements of the household or commercial electricity supply.

Choosing a suitable brand is another major consideration. Purchasing from leading solar panel brands ensure that you have the service and advice that will most likely serve your needs. When it comes to repair and maintenance, spare parts and labor are adequately catered for – more so in larger companies than in smaller mom and pop shops.

Here is a list of leading solar panels brand: BP Solar, Evergreen Solar, General Electric, AEE Solar, Kaneka, Mitsubishi Electric, Kyocera, Sanyo, SunWize, Suntech, Sharp and Uni-Solar.

There are professionals in these companies that can help you size your solar power system. With your average power consumption figures and number of sun hours at your location, they can determine the specifications you need for your solar panels and other related components.

Depending on your budget, you may be advised to install as many solar panels as is required to supply all your household electricity needs. Or you can install the solar panels in stages. The specifications for each option are different and it is important to purchase a system that fits your requirement so you’ll not spend more money than necessary.

Along with solar panels, other necessary components for a home solar power system are inverters, batteries and mounts. These, too, have different specifications and you’ll need to choose one that suits your need.

Another consideration when buying solar panels is the warranty period. Companies offer different warranty periods and it is important to check that this period is much longer than the calculated payback period.

Keeping these pointers in mind as you shop for solar panels, you are better equipped to buy solar panels that can serve you for decades and put money back into your pocket.

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