This is the amount of power you wish to produce every month. This value is listed in your power bill.

This is the amount of power you wish to produce every hour.

What voltage would you like your system to run at? Your batteries will store power at this voltage.

This is the average amount of sun that your location gets everyday. This value is a yearly average.

This value is required because temperature has a significant effect on battery dynamics. The temperature has to be taken into consideration if an accurate estimate is to be made.

This value specifies how deeply you wish to drain your batteries. It is recommended not to go above 50%.

The resistance in wires causes a small amount of voltage to be lost. This has to be taken into consideration when determining what type of wire would be best for your requirements.

The longer the distance the more the amount of voltage that will be lost. This has to be taken into consideration when determining what type of wire would be best for your requirements.

What is your monthly bill amount? it will be found on your electric bill.

Solar Calculator

Please enter proper zip code

Enter the amount of power in KWH that you would like to output




Select Your Panels

Select Your Batteries

Select Your Inverter

Select Your Charge Controller

You will need 33 solar panels which will cost $9,405

The panels will need to be connected in parallel

You will need 44 batteries which will cost $14,960

The batteries will need to be connected in strings of

You will need 1 inverters which will cost $2,150

You will need 4 charge controllers which will cost $2,420

Total = $0

You will also need 20 ft of4/0 Gauge wire (not included in total)

If you have been starting to piece together a way to transition your energy consumption from an electric company to that of solar energy but have no idea where to start or what you would even need, this solar calculator is the answer. Unlike other solar calculators that merely estimate the cost and provide you with carbon and savings statistics should you change, this app takes the transition a step further. By implementing a database of solar energy products, it pieces together a system that will meet your specific energy needs while aiming to save you money.


The database itself contains four kinds of products necessary to build a functional solar power unit: panels, batteries, inverters and charge controllers. Each of the four then have stored values for capacity related to their specific function within the machine. Panels list their voltage current, power and the size of an individual panel in square feet. Batteries store their voltage, amp hours and size in square feet. Inverters track the input voltage and maximum power output. Finally, the charge controller track the maximum current.

To retrieve your estimated price, simply enter in the requested variables. The calculations will run and match you with the cheapest items that meet the specifications. The sun zone is also taken into account as the amount of sunlight received in a region greatly affects how the solar panels should be set up. Once that is done, the price is displayed with the corresponding parts and their basic information including price and capacity. You will also have the ability to edit each individual part to test out price differences if what is chosen is not what you want.


  • Step 1: Database The information is entered. For this example, you need to produce 600kwh per month to supply your home with an ample amount of energy. This variable is then combined with the sun zone variable. The sun zone is the average amount of sunlight you get per day as determined by solar insolation data of US cities. Finally, the system voltage is determined to be 24 and the discharge 50%.
  • Step 2: Component Compatibility The calculator takes the four variables and then runs the numbers through the database, sorting and finding all components that match the specifications. Since the system voltage is 24, the inverter must accept a 24 volt input. The solar panel’s voltage must always be higher than this, so all panels with a voltage less than or equal to 24 are thrown out. Similarly, so too are any panels that have a voltage much higher than the input (for instance a 36 for a 12 volt input would be too much and end up wasting a lot of energy).
  • Step 3: Calculations Now that parameters have been determined, the variables undergo a few calculations in order to produce the necessary data.


For the 600kwh that were mentioned in step one, they are divided by 30 (representative of the number of days in a month) to come up with a daily necessity of at least 20kwh. Once converted to watts per hour per day, the home needs 20000. This is further broken down to determine exactly how many watts are needed per hour, equaling out to each panel needing to produce 6667 watts every hour.

Since you have a limit of a 24 volt input, the database has found a panel that is just a bit higher at 35.77 volts and 8.53 amp. The system can only bring in a maximum of 24 volts. This is multiplied by the 8.53 amps to come up with how much power is produced per panel: 204.72 watts.

Now that the system knows how many watts each panel will bring in, it can determine how many panels your home will need. Since the house requires 6667 watts per hour, divide that by how many watts one panel brings in per hour and you’ll find that you need at least 33 tiles to produce the needed amount of energy.


As discovered earlier, your home will need to store about 20000 watts per day. The batteries found in the database each only hold 6 volts with 4 batteries in a series hold 24 volts. The 20000 watts are divided by the series’ 24 volts to produce the fact that 833.33 amps need to be stored daily. This is then multiplied by 2 to achieve 1667, the number of additional amps required to power the house for two days without sunlight.

The depth of discharge, or the state of the battery’s charge, was denoted to be 50%. 1667 is multiplied with this and then that number is multiplied by a temperature modifier to come up with 4667 amps that need to be harvested per day. Divide this by the battery amp hours (in this case, 428) and you have the number of battery packs of 4 that you need to buy. In this example, 10.9 packs of 4, or 44 batteries, are required.


The inverters are an absolutely integral part of the solar power system since they take the DC and convert it into AC to be used by the house and stored in the batteries. In our example, the database finds an inverter at 4400 watts. When you take the 833.3 watts needed to power the house daily and divide that by 4400, you get 0.19. Since only about 19% of the possible 4400 watt max will be accessed daily, having one of this kind of inverter is more than enough.

Charge Controller

Used to regulate the batteries and keep them from overcharging as well as to regulate the voltage and current, the charge controller is the last main component calculated by the app. It takes the total number of amps that come in per hour and divides it by the chosen controller’s maximum amp rating. Since the total amps incoming with an additional 20% efficiency is 333.36 and the chosen controller’s max amp rating is 94, 4 controllers are necessary to manage the incoming currents.

Additional Considerations

On top of the four pieces of the solar power puzzle, the calculator determines the circular mills area for ease of choosing the proper wiring as well as the necessary square feet of both the panels and the number of batteries.


The numbers of each of the four components are finally multiplied with the listed price, and the amounts are added together to provide you with an accurate estimate of just how much it will cost to transform your home into one that runs completely off of green energy.