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Off-grid PV System Design Scheme

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The basic principles of the system off-grid PV systems are widely used in remote mountainous

areas;without electricity areas;islands;communication base stations and street etc applications

places. Systems are generally composed of solar modules by the PV array;solar chargeand

discharge controller;battery bank;off-grid inerter and D! load and "! load etc. PV array conerts

solar energy into electrical energy #n light of circumstances$ solar charge and discharge controller

supply power to the load$ meantime charging for battery; in the absence of light$ battery bank

supply power to D! load through solar charge and discharge controller$meantimes for independent

inerter$then through independent inerter reerse into "! power to supply power for the "! load.

%.The solar cell module

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7/23/2019 off grid doc 1

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The solar cell module is not only the main part of the solar power system but aslo the highest

alue component$ whose role is to conert the sun&s radiant energy to D! energy.

'. Solar charge and discharge controller

"lso known as (PV !ontroller)$ whose role is to ad*ust and control power issued by the solar cell

modul to ma+imi,e charging the battery$ and played a battery charge protection$ oer-discharge

protection. #n the large temperature difference$ PV !ontroller should hae temperature

compensation function.

. attery pack

#ts main task is storing energy at night or on cloudy days to ensure that the load electricity.

/.Off-grid inerter

Off-grid power system is the core component$ which is responsible for conerting direct current

into alternating current for "! load use. #n order to improe the oerall performance of

photooltaic power generation system$ to ensure the long-term stable operation of the power

station$ the inerter performance is ery important.