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Electric energy has become a necessary part of modern life, and it is not easy for the common man to live without basic electrical appliances. With such a high penetration of electricity into daily life, the reliability of electrical power networks plays a vital role. If the electrical supply network is weak or unreliable, the continuity of one’s power supply is affected. Solar energy-based electrical systems for local loads come to the rescue for ensuring the continuity of electrical power in any adverse situations.
You will be able to understand after reading this article how many watt-hours of energy a 1000-watt solar panel produces as well as how long will it take to charge a battery using a 1000-watt solar panel.
A single solar panel of 1000 watts is still not manufactured due to how large the size requirements for such would be, but we can still install a 1000-watt solar energy system by using a combination of smaller-sized solar panels instead. We can easily run fans and lights, and we can also charge basic electronic gadgets, on a 1000-watt solar panel setup in parallel with charging 150Ah batteries to use as backup during the nighttime, too.
How much energy does a 1000-watt solar panel generate?
Solar panels are designed to give maximum output with 1000 W/m2 of solar irradiance. If we say that the system is installed to generate 1000 watts, this means that at 1000 W/m2 irradiance, the system will give us 1000 watts of instantaneous power. So, to calculate the amount of energy, if we consider 5.5 hours (on average) of sunshine:
1000 watts x 5.5 hours = 5500 watt-hours = 5.5 kWh
Therefore, a 1000-watt panel setup for solar power will give us 5.5 kWh of energy or 5.5 units of energy per day (on average) and around 170 kWh of energy per month.
In the market, a solar panel of 1000 watts is not currently available, but you can instead use any number of combinations of different wattages of solar panels to get your 1000 watts of solar energy. Let’s look into the calculations and other parameters necessary to be aware of in order to select the best combination of solar panels and other components of such a system in the following subsections, then allowing you to build the best possible system for running your common household appliances.
Selecting solar panels for a 1000W solar energy system
By having multiple solar panels of power values less than 1000 watts and in combination with each other, you can easily achieve 1000 watts or 1kW of solar energy. Nowadays, 540-watt solar panels are the most commonly used solar panels and work well for this setup.
540-watt solar panels
You can install two 540-watt solar panels to achieve your 1000-watt solar energy system. However, the issue with using 540-watt panels to make a 1000-watt system is that if you were to install two panels in a series, the open-circuit voltage will be around 100 volts. If you install these two panels in parallel, the current will be around 30 amperes. The most commonly used charge controller and inverter have limitations when it comes to voltage and current, and they can handle neither such a high voltage nor a high current.
With this being the case, you’ll have to choose smaller solar panels with either lower voltages and/or lower currents. If someone wanted to install a 1000-watt solar energy system using only 540-watt solar panels, the charge controller and inverter should have a current rating of 40 amps and an input voltage rating of 50 volts. Generally, an inverter with such specifications is not available.
280-watt solar panels
You can use multiple 280-watt solar panels to accomplish putting together your solar energy system of 1000 watts. A combination of four such solar panels will provide 1000 watts of power on a clear day. The open-circuit voltage of 280W solar panels is 21.6 volts and their maximum current is 8 amps. If you install all four in parallel, you would need a 40-amp inverter or charge controller to regulate the power. Additionally, series panels will increase the voltage level.
The combination of two panels in series and two such combinations in parallel will give around 18 amps and 70 volts as its output. Most commonly, one would install 280-watt solar panels in parallel with a solar inverter that can handle 40 amps of input current. These solar panels are often recommended and installed for those desiring a 1000-watt solar power system.
160-watt solar panels
The second most commonly used solar panels for smaller-sized solar energy systems (< 3kW) are the 160W solar panels. For a 1000-watt solar energy system, seven of these solar panels are used to reach approximately 1000 watts of power. Similar to the 280W panels, these lower wattage panels have an open-circuit voltage of 21.6 volts and have a maximum current of around 7 amps. So, with a 40-amp inverter or charge controller, four of such panels can be installed in parallel with two strings of four panels (40 volts open-circuit).
Charging batteries with a 1000-watt solar panel
1000-watt solar panels can charge a reasonable amount of energy-storing batteries. As previously discussed, this type of setup generates around 5.5 kWh per day, so let’s see how many batteries it can charge each day.
A 12-volt, lead-acid, deep-cycle battery is commonly used as an electrical backup with a solar power energy system. A 200Ah battery contains 12V x 200 Ah = 2.4 kWh of energy. So, a 1000-watt solar panel can charge two 200Ah batteries during the course of a day. If the inverter or charge controller have ability to charge at 24 volts, two series of 200Ah batteries can be charged during the entire day.
Two 200Ah batteries can provide a reasonable amount of backup power to run basic household appliances during the hours when the sun is not present and able to provide energy via the solar energy setup. These batteries can run four ceiling fans for about 10 hours, which is a pretty good backup option for the average household. With three fans and eight LED lights (each being 7 watts), these batteries can provide the same amount of backup power time for these as well, so you will be able to enjoy green energy for free in your home during the nighttime hours, too.
An essential component of daily life is mobile phone charging. You can easily charge your mobile phone with a 1000-watt solar energy system. Even during the day when your solar energy panels are charging the batteries for use as your backup power source, you can charge eight mobile phones and run five LED lights (10W each) in parallel with battery charging. You can also run three fans in parallel with charging two of your 200Ah batteries with no problem.
Lighting using a 1000-watt solar panel system
An average LED light bulb used within a home consumes about 7 to 10 watts of energy. During the day when sun is shining bright, you can run up to about 100 of such LED lights on a 1000-watt solar energy system.
Running fans on a 1000-watt solar panel system
A common household ceiling fan consumes 80 watts of power when running at full speed. If you wish to run fans on a 1000-watt solar panel system, assume 100W of power per fan (adding all the losses of conversion and power transfer). You can easily run ten ceiling fans on a 1000W solar panel system at full speed without any interruption, by these calculations.
Different combinations of market-available solar panels can be used to make a 1000-watt solar panel energy system. The best choice for this is using solar panels that have 36 solar cells and have a maximum current of 7 amps. This combination is primarily chosen because of the market-available inverters or charge controllers and their maximum ranges regarding voltage, current, and overall power.
A 1000W solar energy system provides enough energy during the sunshine hours to run appliances that are necessary over the course of a day for a medium-sized home. It can easily charge two 200Ah batteries for backup power later on during the nighttime hours. This system can also run 10 ceiling fans or even 100 LED lights, but you’ll need to find suitable combinations of electrical loads so that you can run all of the necessary appliances on your 1000-watt solar panel setup and save some energy to use during the nighttime hours, too.
The best and most suitable combination according to experts is that your charge two 150Ah batteries and run three fans, ten 7-watt LED lights, and three mobile chargers during the day. The batteries will give you enough backup during the night, and this combination will help you enjoy basic household life using green and free energy.
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