Free power calculation tool

Brief Instructions for the System Sizing Estimator. Use this estimator to get a pretty good idea of how many Solar Panels you will need to generate electricity and how many Storage Batteries you will need to store that electricity. The estimator lets you make simple choices and then calculates the WattHour usage based on typical configurations. After you see how the estimator works, you can figure your own system size much more accurately by determining the wattage needed for each of your appliances and then manually calculating the required WattHours.

This procedure is explained under the details of the Estimator's Calculations below. Just click the 'Calculate' button below to see the pre-selected default settings which approximate the typical usage for a small household of 2 persons. Or, select the choices that apply to you from the drop down lists then click the 'Calculate' button below.

Select size in cubic feet. With an icemaker, select the next larger size. Add wattage of lights in all rooms. This section allows you to add power usage from 25 to watts for extra items or items not included above. The batteries are assumed to be standard 12 volt amphours.

Step 1 is to calculate the daily WattHour usage of each item. This is done by multiplying the item wattage by the number of hours used each day.

Sometimes only the voltage and amps example 1. No problem. Simply multiply x 1. The more times you open the door, the longer they run. In the Estimator, this is figured into the equation. Step 2 is to add up the WattHour results for all of your appliances. This will give you the total daily WattHours required. Step 3 is to assume that you want at least 3 days of operation before the batteries need to be recharged.

So you multiply the total daily WattHours by 3. In practice, you will only have to be concerned about this in bad weather or winter. See Meters and Monitors for more about keeping an eye on things. In other words, the tilt of your solar panels is equal to the latitude of your place. Round up the calculated value. You have chosen your system voltage to be 12V and your solar panel to be Watt for the 12V solar system.

After rounding it up we receive that you need to buy 21 solar panels. Please, use the update button below the calculator body to update the calculated results if those results are not updating automatically. Using the off-grid system solar panel calculator. You need to sum the wattages of all the electrical devices you use on a daily basis and therefore you want your off-grid solar system to support.

Each device has its wattage on its back label. So, please enter the sum of Watts your electronics consume daily. You should decide for how long you have all these devices plugged in every day so that the solar system will be able to power them. Here you need to enter the average daily hours of operation rather than the maximum ones.

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More Topologies. PowerEsim's Sponsors More Electric energy is transformed to be the engine of any power supply. This kind of electronic system converts electric energy to mechanical energy from the source to a given load.