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  • Off-Grid Inverters  



    Off-Grid PV Power Generation:-


    off-grid plant

    Off-Grid PV power plants are working independent from the grid and they consist of PV panels, as power generator source, and all other B.O.S. system components: string combiners, home run cables, rapid-shutdown, disconnects, critical load panels, surge protection, plus electric power storage system (battery banks or a Power Wall component alike) which will guarantee electric energy supply when natural lighting respective solar irradiation is poor. Since the current generated by the PV power panels is delivered in a DC form (as direct current power output) we will need an inverter to correct the power factor from DC to AC. Thus the Off-Grid Inverter becomes the core of the B.O.S. (Base of System) and is transforming the DC power to AC power. In most of the PV installations, the inverter will work as a battery bank charger along to its main function of generating grid alike power output. In an Off-Grid configuration the PV array it is over-dimensioned in such, during the high irradiation hours both the power supply to load as well as the recharge of the storage batteries can be guaranteed. Off-grid inverters are designed to handle battery banks and external conventional generators, all at the same time.

    Common functions build into Off Grid Inverters:
    >_Charges Batteries While Supplying;
    >_Cleans and Regulates Power Output;
    >_Correlating with an External (Petrol based) Generator Set;
    >_Efficiently Handles Surge Requirements of Electric Motors and Pumps;

    Choosing Off-Grid Inverter requests some of the Inverter specific values to be correlated to the PV array output, the battery bank, and even with an external power generator set. Here is a list of Off Grid Inverter parameters to consider:

    [Tech Support]  Knowledge Base Information for:   Off Grid Inverters  
    Read from Knowledge Base and download a pdf file @  Article:   101 RENEWABLE - OFF GRID POWER INVERTERS 
    Fold | Unfold [ click ]  Read more...  

    Waveform (sine wave vs. modified square wave):-

    Off-grid inverters are sold with two waveform options: sine wave and modified square wave (sometimes called “modified sine wave”). Sine wave output has low total harmonic and is the most commonly used for residential systems. Modified square wave is used in the budget type of installations (remote cabins and observation posts). They do not run some types of loads optimal and they may harm those appliances.

    Total Harmonic Distortion (THD):-

    Is the measure of how closely the waveform matches a perfect sine wave. A THD of 0% is a perfect sine wave, and the larger the percentage, the farther it deviates from a sinusoidal waveform. Sine wave inverters typically show a THD of 5% or less, while the THD of modified square wave inverters may range from 10% to 40%.

    Rated Continuous Output Power:-

    An off-grid inverter must supply enough power to meet the needs of all the appliances running simultaneously.

    Nominal Battery Voltage(s):-

    Each inverter has a nominal battery voltage where it can be connected to. Common off-grid inverter battery voltage options are 12, 24, or 48 volts. Exeltech’s line of inverters, for example, includes models that can connect to 32, 66, or even 108 volts battery banks.

    Output Voltage:-

    In the United States the Off Grid Inverters are designed for 60Hz at 120V or 120/240V appliance (electrical load) voltage. So-called export inverters are designed for 50Hz at 240V or 240V/380V.

    Peak Surge:-

    Some loads (like motors) require significantly more power during startup than they need to run. To start these loads, inverters will briefly “surge” or run at higher than their continuous power rating. Surge ratings include the maximum amperage the Inverter can deliver for a time period at that high power level without sustaining damage or turning off to protect itself. A good number is in a range of 50Amps to 120Amps for 1sec.

    Inverter Peak Efficiency:-

    Efficiency is measured as the ratio of the inverter’s AC power output to the DC power input. Higher efficiency means that the inverter wastes less power while converting DC into AC. Common values are in the range 90% to 98%.

    Stack ability:-

    Some off-grid inverters include the capability to connect several units to operate as a single, larger unit. Stacking options allow 120 V inverters to work together to power 240 V loads.

    The information posted herein has been compiled by Clean Energy Brands from OEM product data and reputable publications. All rights reserved!




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