How to choose a solar charge controller
Solar charge controller: How to choose it
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Finally SOLARIX has arrived, the Mppt Solar Charge Controller that is able to increase the energy efficiency of photovoltaic systems up to 30%!
With this program you will be able to size correctly the electric cables to connect battery and inverter of your photovoltaic system.
Easy and free!
You need a charge controller for your photovoltaic system but you don't know which one to choose? The market offers different types of solar charge controllers at different prices. But what is the right one for you? It is therefore very important to know their characteristics and how they work in order to make a purchase safe and durable. Mppt Solar has selected for this market two of the best charge controllers for solar panels and has created this information page to help you in choosing the right charge controller for your photovoltaic system based on the type of panels and battery want to install. If during the planning of your PV system to the island you have decided to choose certain panels instead of others is good to know that this choice may suggest a regulator rather than another. Our charge controllers are of two technologies: mppt and pwm.
Where to use a mppt solar controller and where to use a pwm one.
As we said, the choice of technology of the charge depends on the type of panels that have or want to install both the battery bank. The controller pwm normally costs less than an MPPT controller, but the controller mppt is able to take full advantage of a solar panel with voltage well above the batteries bank and therefore enables the production of more energy compared to a regulator pwm. If the voltage of the panel is slightly greater than that of the battery (typical case of a panel to 12V and 12V battery 30 cells), the controller pwm is recommended because it has a daily yield in this case similar all'mppt. Below so we made a very simple table where you will find the technology of the charge controller to use based on:
1) Number of cells that make up your panels
2) Voltage of the battery bank that you want to charge.
How to understand the voltages of the panels as a function of their cells.
30 cells Panels --> Rated voltage = 12V Open circuit voltage = 18V
36 cells Panels --> Rated voltage = 12V Open circuit voltage = 21V
48 cells Panels --> Rated voltage = 18V Open circuit voltage = 30V
54 cells Panels --> Rated voltage = 18V Open circuit voltage = 33V
60 cells Panels --> Rated voltage = 24V Open circuit voltage = 36V
72 cells Panels --> Rated voltage = 24V Open circuit voltage = 42V
120 cells Panels --> Rated voltage = 48V Open circuit voltage = 72V
144 cells Panels --> Rated voltage = 48V Open circuit voltage = 84V
What is the behavior of the two solar charge controllers technologies?
And now we see two photos we took to show the behavior of the current in the pwm charge controller PR3030 and mppt charge controller Solarix. As we used a panel solar panel 100W monocrystalline silicon. The angle of the panel was not exactly perpendicular to the sun's rays needed for a "photographic". The battery is a 12V Lead-acid Fiamm battery.
1) Pwm solar charge controller PR3030
As can be seen from the picture, leaving the panel we have a current of 1.60 A, which is used almost entirely by the controller pwm (1.57 A) to charge the 12V battery. The solar charge controller PR3030 can withstand currents of up to 30A and also presents the display function of the percentage of battery charge. In this case, informs us that the battery is charged to 76%.
2) Mppt solar charge controller Solarix
Unlike the regulator pwm which considers only the current to the end of charging, the regulator mppt Solarix considers all the power of the photovoltaic panel (then voltage and current). In fact the difference between the voltage delivered by the panel (example 36V) and the necessary voltage to the battery at that moment (example 14V) is not lost but is transformed by the current regulator mppt useful to the process of charging. From the picture it is seen that the output current from the panel is of 1.68 A, but the current that goes to the battery is even of 2.07 A. With the mppt solar charge controller Solarix use all the power of the panel!
Discover the wonderful advantages that solar and wind power makes us available:
1 free energy
2 clean and inexhaustible energy
3 energy accessible from all over the world
4 energy available at night through the ability to store it in batteries.
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Maximum Power Point tracker solar charge controller ( MPPT ): MPPT charge controller. Paperback: 72 pages
Solar II: How to Design, Build and Set Up Photovoltaic Components and Solar Electric Systems. Paperback: 194 pages
Low Cost Solar Charge Controller: A Design for Solar Home System at Reduced Price. Paperback: 84 pages
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