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Planning a Standalone PV System
Stand alone or perhaps autonomous devices are not coupled to the grid. A few stand alone devices known as PV-hybrid systems or perhaps island system, may also include another source of power, wind turbine, bio-fuel or diesel electrical generator, etc . A stand alone system varies in proportions and type, but 20Wp - 1KWp are quite prevalent. The stand alone system is also called an off grid system. Stand –Alone system (Off-Grid systems) make use of a photovoltaic program to supply electricity to a customer unit immediately or with a battery, � independently of other powers. These devices are suitable for little devices and equipment certainly not close to a great electricity source (e. g. street light, water pumps, radio and signal equipment). Stand-Alone System Design Method
There are a few methods that need to be considered when designing a stand-alone program and pursuing are the steps: 1 . Determine the Load
FILL: - Look at a system which in turn draws an average of 25W pertaining to 24 Hrs per day for 24V DC. The current pull is installment payments on your 09A. -- Load calculation can be down in two ways: either computed on a daily basis or weekly. 1 . Decide Electric battery Storage
In order to handle the burden and enabling 5 days of battery storage area, for the above mentioned load the battery storage space (Ah) will be calculated as 2 . 09 A x 24 h x five days sama dengan 250. almost 8 Ah
Watt-Hours = V x Amplifying device hours.
So , for the 12 v battery, 12-VOLT @ 250. 8Ah = 12 times 250. almost eight = 3009 Watt hours or (3. 009kWh) 2 . Determine sun radiation pertaining to the site location
Consider a web page where the program will be established. Then receive the average regular monthly solar light falling on the horizontal planes in that place. The data could possibly be obtained pertaining to the location from the nearest weather condition station. several. Approximation of Array Size - If the system is likely to be used throughout the year and the strength requirement is fairly constant in that case, Array Size (Wp) sama dengan Daily strength requirement in Watt Several hours [Wp] as well as Average Daily PEAK SUNLIGHT HOURS as well as System Effeciency. Array Size [Wp] sama dengan = 187. 2Wp
Solar power panels
Charge Control mechanism
Mains Electrical energy
Battery Traditional bank
Components of a stand alone solar PV system.
Solar Panels (PV) Modules
The DC electricity produced by the solar panel or perhaps module(s) can be used to demand batteries with a solar impose controller. Any DC kitchen appliances that are connected to the battery will have to be fused. � DC signals are normally coupled to the charge control mechanism. Any AIR CONDITIONING UNIT appliances happen to be powered through an inverter connected right to the battery packs. Inverters utilized in grid tie and standalone systems vary and should not really be interchanged. Configuration
The solar panels have to be configured to match the system POWER voltage, which is determined by the battery. Program voltages are normally, 12V POWER and 12-VOLT DC, bigger systems will operate by 48V POWER. The working voltage of the solar panel within a stand-alone system must be high enough to demand the batteries. For example , a 12V power supply will require 16. 4V to charge it. The solar power must be capable of deliver this kind of voltage towards the battery following power losses and volts drop in the cables and charge controller and in conditions in which the solar cells operate in a high temperature. A solar power electrical with a Voc of about 20V is required to dependably charge a 12V electric battery. Charge Controllers
A fee controller is designed to protect the battery and ensure it has a lengthy working life without impairing the system effectiveness. Batteries must not be overcharged and the function in the charge control mechanism is to make certain that the power supply is not over incurred.
Charge remotes are designed to work as follows:
safeguard the power supply from over-discharge, normally called low volts disconnect (LVD) that disconnects the power supply from the load when the electric battery reaches a certain depth of discharge (DOD). protect the battery from over-charging simply by limiting the charging volt quality - this is very important with closed batteries - it is usually referenced...