Category: Blog

How to Calculate Solar Panel Battery and Inverter

How to Calculate Solar Panel Battery and Inverter?How to Calculate Solar Panel Battery and Inverter?

Before you even decide to buy a solar panel system always make sure that you know how to calculate solar panel battery and inverter. This will give you the ability to be informed of what you’ll get from the solar panel system that you’ll buy. In this article, we will tackle all about that.

The Parameters

To properly determine the calculations, you’ll need to know the parameters. They are the determinants for you to compute them accurately.

  • Knowing the wattage of every load. You need to have an approximation of the electricity requirement of every load. In this way, you’ll know how much capacity you will need. For example that you have a 100-watt appliance that needs to keep running continuously for 10 hours. Then you can use the following formula:

10 HRS x 100W = 1000 Wh

The result will be the absolute power needed to run a particular appliance. So moreover, to know the total wattage needed you’ll need to know your loads individually.

  • Knowing the estimated solar panel dimensions. By doing so, it will give you an idea of the maximum capacity of the battery that you’ll need. To know it, you must do some minor estimation. For example, the panels will about to get 10 hours of sunlight daily. In this manner, you’ll know if the previous watts per hour that we calculated a while ago can be accommodated without any hassles. You can use the following formula:

1000 Wh / 10 HRS of sunlight = 100W Solar Panel

Although this formula is only applicable to the summer season, you can always modify it. When the summer is over you might want to lessen the hours of sunlight in the formula. Is it safe to say that 4 to 5 hours might be a decent estimate for the amount of sunlight that the solar panel can acquire in the winter season. So the amount of wattage requirement might increase twice its amount in the summer season. 

  • Figuring out the battery’s max capacity. This might be a daunting task to do because we are not all engineers, but believe us it is an easy task to do. The maximum capacity of the battery is known as its Ah. It is the standard unit of measurement used to denote the battery’s capacity and we can mostly see it on the label at the back of our phone’s battery when we take it off. 

Just the same with phones, we are checking its Ah before buying it. This will let us know if they can hold a charge for a long time. Just the same with solar panels, we need to know their Ah to know if they will suffice our required electricity consumption. Here is the formula that you can use in knowing the Ah of the solar panel battery:

1000W / 12v = 83 Amp per Hour

However, for it to be applicable for the inverter, you’ll need to add 20 percent tolerance. It will round up the outputs and can give you a 100Ah 12v battery output.

Also, you must take note of the brand of the battery because it must be reliable. This is because you do not want any mishaps to happen while the solar panel is operating. Most probably, if something goes wrong with the battery such as explosions then most probably your solar panel system might be damaged too and you do not want that to happen.

Evaluating the Inverter Specs 

Last but not least is by knowing the specifications of the inverter. The specific capacity will allow you to know the compatible solar panel system that you must have on your property. Compared to the battery’s capacity, knowing the inverter specs is more complex. 

Because we are already aware that 100w is the max load wattage which is the power that it can accommodate in its comfort zone.

So it only means that if you want a solar panel system that will truly be efficient then you must get a best solar inverter that has a rating of 100w. Putting up some extra tolerance will be a good idea just to be sure that all your appliances and devices can be powered up.

As we all know, inverters are used on a wide range of electronics nowadays. This is because of their ability to make certain appliance energy efficient. Just the same with solar panel systems, they tend to utilize the power better leading to desirable results.

Extra Tips

If you have no idea how to check the power consumption of a particular appliance then you can always check the label at its back. Electronics manufacturers do include the specifications on the product’s body mostly at the back. The info about the wattage comes with the model no. and manufacturing date.

Another thing is when buying an appliance, always choose the ones that consume lesser electricity. As a result, you do not need to put a lot of thresholds when you compute the solar panel battery needed to run it. Just be sure that the appliance fits your needs too and the low wattage does not compromise its performance.


Now you know how to calculate solar panel battery and inverter, you’ll have the idea of the best solar panel system for your home. So once, bought it you’ll never have any regrets. Just keep those parameters in mind and you will surely never go wrong on your purchase. 


How Long Does It Take To Break Even On Solar Panels

How Long Does It Take To Break Even On Solar Panels?How Long Does It Take To Break Even On Solar Panels?

There is no doubt that solar panels are a huge investment to make. But its advantages always supersede the expensive cost that it has. Even though it is also better if you will know how long does it take to break even on solar panels? By doing so, you will have an estimate on when you will get your return of investment.

Some Examples on How to compute it

For example, you are just on your 1st year of ownership of your solar panel system. You’ve just spent over 6,000 USD on your solar system panel. It includes all the fees such as taxes.

Over time you are getting the benefits from the solar system that you have bought. It is just like you are earning from it because of the money that you are saving with the use of it.

This is where you can get your return of investment from the everyday usage of the panel. Let us say that you are using the panel daily with just the usual consumption of residential houses. It will take about 6 to 7 years before you can say that you’ve got your investment back. 

So for 25 years imagine how big you can truly save from using solar system panels. It is projected that you might save almost 20,000 USD. It is a big saving for you because after the 6th year you’ll be able to save a significant amount of money without thinking of a capital. Another thing is the solar panel systems usually last for extended periods which is a good thing.

Is it accurate?

Although the said amount is purely estimated, you’ll still get the idea of what you can get if you’ll avail of your solar system panel. This is because getting the exact amount is hard to calculate probably because of the different factors that comprise it such as:

  • The exact hours of the usage of your daily appliance
  • The amount of sunlight available daily
  • How often you are cleaning the solar panels
  • The electricity costs in your area

So the said rough estimate a while ago can decrease or increase depending on the said factors above. 

The Installation Takes a Huge Part too!

There is no contest that solar panels need to be installed by certified professionals. This is because they have complex mechanisms that will hinder ordinary people to install it on a “DIY” manner. So this help from professionals requires money and never comes free except that you know the installer personally that is a rare case.

The good news is every year there is a decrease in the price of materials that are used in the solar panel. This is an advantage for a lot of people who are reluctant in putting up their solar panel system on their property because of the lack of budget. 

Once you already have a budget for the equipment then the next thing that you should save up for is the installation. It nearly makes over 30% of the total cost of the solar panel system.

What is break-even computation?

It is said that several factors comprise the break-even computation. In this part of the article, we will try our best to unlock it.

One important thing that you should take note is that various solar panel manufacturers do have different pricing on their products. Mostly, because of the different laws on every state, you can expect that it will also affect the pricing of the panels. Not only that, services such as installation, repairs, and maintenance.

These are the factors that we used to get that break-even calculation.

  • The climate on the area: It is important to take note of the climate in your area to know how much solar power you can accumulate daily.
  • The placing of your panels: There is surely a certain area in your property wherein it is exposed more than the other. So always do your research and observation on where is the most appropriate place to integrate those solar panels.
  • The rate of efficiency of the solar panel: This factor will determine how good the solar panels were. So it is much better if you do some surveying first before locking a contract with a particular solar panel company. Always go for the most efficient ones because it will let you get your return of investment much quickly.
  • Roof orientation: Always make sure that your roof will allow the panels to have the maximum potential of accumulating more solar energy as much as possible.
  • Time of use: Well, you must be aware that the longer the time of use, the more solar energy you’ll get. In this case, the time of use will be considered as a factor as well.
  • Checking out the cost of fees: Aside from the installation fees, the taxes and electricity costs in your state are big factors. The bigger they are the longer it would take for you to get your ROI back.


Now you have an idea of how long does it take to break even on solar panels, you can start taking actions. Two outcomes might happen, you’ll get a solar panel for your household or not. But the most important factor in your decision is weighing about the benefits that you can get from solar panels and how you can afford its costs.

Solar Energy Advantages Disadvantages

Advantages and Disadvantages of Solar EnergyAdvantages and Disadvantages of Solar Energy

Solar energy is being talked about by everyone from the media to the Obama administration. Why is everyone so interested in solar energy? This article will discuss the advantages and disadvantages of solar energy.  There are many advantages that have so many people excited, but there are also a number of disadvantages. Luckily, many of the disadvantages can be overcome with some know-how if you are willing to put in some work yourself.


Never-ending source of energy

Solar energy comes from the sun so there is no end to the amount of energy that can be generated. The sun is producing energy 24 hours a day, 7 days a week, 52 weeks a year.  There is a limited supply of fossil fuels like oil, gasoline and natural gas, but we won’t run out of solar energy until the sun disappears and by then we’ll have a lot bigger things to worry about than how to run air conditioners!  As we use more and more oil, and oil becomes scarcer and scarcer, the price will continue to rise.  For solar energy, the opposite is true! Solar energy will never run out and as technology gets better and better, the cost of producing solar power will actually continue to go down.

Free energy

As long as the sun keeps shining, energy from the sun will be free. While there is an upfront cost for solar cells and equipment, there is no ongoing cost aside from maintenance of the equipment and possibly battery replacement.  With enough solar panels, you can completely disconnect from the power grid and never again pay an electric bill.  This is called off grid living.  Some people choose to stay connected to the grid, produce more electricity than they use and the electric company actually pays them!

No greenhouse gasses

If you are concerned about global warming, solar power is the answer!  Unlike fossil fuels like oil and gas, solar electricity produces no greenhouse gasses whatsoever.  Want to reduce your carbon footprint?  Solar power is an excellent way to do it.  Solar  electricity generates no CO2 or emissions of any kind.

Reduce dependence on foreign oil

Many people consider dependence on foreign oil to be one of the biggest security threats today.  Solar energy reduces our dependence on foreign oil.  Any electricity produced domestically will directly replace energy that currently comes from foreign oil.  Creating more power from solar electricity is an excellent way to reduce dependence on foreign oil.


Initial cost

Probably the number 1 disadvantage to solar electricity is initial cost.  While the ongoing costs of solar electricity are very small, the initial cost of solar panels can be quite high.  If you have the know-how, you can reduce the initial cost a great deal by building your own solar panels.  This guide can show you how to do it.


You need enough space for solar panels and, in addition, the solar panels need a clear view of the southern sky.  For houses, solar panels are usually located on the roof, but solar panels can be located on the ground.  For maximum efficiency, it is best for the solar panels to be built to turn to face the sun throughout the day.

Works best in areas that receive a lot of sun

In additional to needing space and a clear view of the southern sky, for maximum efficiency, it is best for solar panels to be located in a part of the world that gets a lot of sun.  There are solar maps that show average sun for different areas.  If a solar panel is located in an area with double the score, it will produce, on average, double the electricity with the same size panel.  Just because you live in an area with a low score, it doesn’t mean that you can’t use solar electricity, it just means you will need larger solar panel space to produce the required amount of electricity.

As you can see, there are solar energy advantages and disadvantages.  I think you’ll agree, though, that the advantages far outweigh the disadvantages.  One way to avoid many of the disadvantages is to build your own solar panels.  For a great guide to building your own solar panels, including including diagrams and videos