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This web page provides the free online resources available with The Solar System ebook

It is well known fact that converting a home, business or RV (Recreational Vehicle / Caravan) to use solar energy can save on utility charges or hook-up fees, is greener and is something many of us can do to reduce global warming.

What many people do not know is how to correctly size a solar system to meet their energy needs.

If your aim is to reduce your energy charges and save money; then having a solar system that is sized/designed to meet your requirements as closely as possible will not only reduce your installation costs but it will also help you to recoup the installation costs quicker. If a solar system is larger than required not only will it increase the installation costs but it will also substantially increase the payback period.

In order to use the calculator please log in using the log in details provided when you ordered your The Solar System ebook. If you have not ordered your copy yet please Click here to get your copy. The The Solar System ebook contains important information you need to know about different solar systems and how to use the calculator to correctly size a solar system to meet your needs. If you have your log in information please Click here (you can also request a new password if required).

Welcome to the online solar system calculator for the The Solar System ebook

As detailed in the ebook that you ordered there are numerous ways to connect up a solar system. Some of the options are more efficient than others. Here we assume that you will be using one of the most efficient options where the solar panels are connected to a MPPT charge controller that will be connected to one or more inverters and an optional battery(ies). This option tends to be more efficient than a system where DC solar energy is converted into AC and then converted back into DC to charge any batteries.

The calculator is divided into a series of steps. Starting from establishing your energy usage and solar irradiance at your installation location to finding how many solar panels (and optionally how many batteries) and other components are required.

Some of the steps include information relating to solar systems directly connected to the grid. If your system is not directly connected to the grid this information will provide you with an indication of the savings in relation to a grid tied system.

If you need independent help or advice on a new solar system or to improve an existing solar system click here to contact us

The steps are:-

The grayed steps require previous steps to be completed or confirmed.

There are also some optional settings such as displaying detailed help tips / information under each input field making it easier to use for first time users.



Settings and options

Changing the options and settings is optional however displaying the tips is recommended for new users, with touch screen devices.

This page includes additional help information and tips for the various steps and the data input fields. Where a More... button is shown detailed information can be displayed by clicking ot tapping the More... button. This can be hidden by clicking on the More... or Less buttons. Additional tips for most input fields are available for most input that on devices with mouse/trackpad can be displayed by hovering over the red ?. For devices with a touch screen you can tap on the red ?. Note on some devices this also scrolls to the top of the page. If your device scrolls to the top of the page each time you tap on a red ? check the Show tips check box and click on the UPDATE button to show the tips under the fields.


      ?Check this item to show the advanced mode. In this mode the user can change some of the more advanced settings


      ?Check this item and update to display the detailed step information


      ?Check this item and update to display the input tips under each field. Recommended for touch screen devices


      ?Check this item and update to reset the data to the default values. Only do this to clear all data input. This option automatically clears after use.


      ?Check this item and reload the data from the last saved settings. This option automatically clears after use.


      ?Uncheck this item to disable the automatic save feature.


      ?Check this item display the CSV (Comma Seperated Values) data. This data can be copied and pasted into a spread sheet application for further analysis.


?Select normal text size. The current size is 18










Step 1

Estimate the energy usage per month from annual usage

Note, skip this step if you have the actual monthly energy usage. Click here to go to Step 2

If you do not have specific energy usage for each month of the year. This calculator will estimate the monthly variations based on the hemishere and some typical usage.

?Select the installation hemisphere (North or South of the equator)




?Input your total energy usage per year in kWh. If you use multiple elergy types such as Gas and Electricity either add the kWh usage together for each type or if you just want to consider using solar system to replace the electrical usage eneter just the electrical usage. Typical values range from 8400 to 24000 (US) (Small user to Larger user respectively). This information can normally be found by adding the usage from your utility bills for a 12 month period. If you do not have a full years information find the average monthly usage and multiply it by 12 as a best estimate. Where possible use actual usage from the meter readings and not utility estimates which may vary significantly from the real usage.


The current total energy usage for an average houshold is 14900 kWh (2900 (Electricity) + 12000 (Gas)) per year (UK) and 10524 (Electrical) (US).


?Select the approximate percentage of your energy bill that is used on heating and cooling (air conditioning). The average figure for a USA houshold is 50%. Use zero if you do not spend anything on heating or cooling.




?Select the approximate percentage of your heating and cooling bill that is due to heating in the winter. If your heating and cooling require about the same amount of energy the use 50%. If you use more energy on heating use a figure of 55% to 100%. If you use less on heating use a figure between 0% to 45%




Note, Clicking on the CONFIRM / UPDATE button will automatically calculate and update the estimated Monthly energy usage data in Step 2




Step 2

Monthly energy usage

If you have the actual energy usage per month then input the values below. If you do not have this information use the form above (Step 1) to generate some estimated values from your annual usage and the heating and cooling percentages.

Please note, if you use more than one energy source you can either design the solar system to replace just the electrical energy or the electrical and other energy usage. There are two ways to input the current usage data. Option 1 is to enter the total monthly usage in the Input your total ELECTRICAL energy usage in kWh for each month. Option 2 is to set (check) Show the Gas (or other) energy usage fields in the Settings and then enter the other energy usage in the Input your total GAS (or other) energy usage in kWh for for each month that is displayed below when Show the Gas (or other) energy usage fields is checked. In either case the solar system will be based on the total monthly energy usage provided.

Monthly electrical energy usage

?Input the ELECTRICAL energy usage for Jan A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Feb A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Mar A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Apr A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for May A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Jun A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Jul A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Aug A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Sep A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Oct A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Nov A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




?Input the ELECTRICAL energy usage for Dec A typical average figure is 877 but it is important to input ralistic figures for each month in the year to ensure that the winter and summer variations can be correctly accounted for.




Daily energy variation

?Typical energy usage varies not only as a result of the seasons but also day by day. This means that more than the average monthly usage will be used on some days. While often there are things that can be done to reduce the peak daily usage there will inevitably be days that require more energy. In order to design a soler system to accomodate the maximum daily usage you can provide the percentage peak daily usage over and above the average daily usage for the month. To cater for the peak daily usage input the percentage variation above the average value. Set to zero if you only want to cater for the average daily usage. A typical average figure is about 10 to 40 percent but it is important to input a realistic value related to your energy usage variation. If you have the daily kWh usage. You can alternatively input the daily usage values seperated by a space to have the variation percentage automatically calculated. If providing a series of values, the Daily energy percentage variation percentage will be based on one standard deviation of the values provided.


If you wish to allow for daily energy variations over the average, set to the percentage over the average to be allowed for.






To view the next step, check and the information in step 2 and click on the CONFIRM/UPDATE or UPDATE button for step 2

Note, if you do not have the Monthly energy usage information required for step 2; compleate the fields in step 1 and click on the CONFIRM/UPDATE or UPDATE button for step 1.

Then after checking the information in Step 2 click on the CONFIRM/UPDATE or UPDATE button for step 2.



Additional information

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