An off-grid solar power system (PLTS) is a solar power generation system capable of operating independently, without connection to the main electrical grid. This system is ideal for remote areas in Indonesia located far from the national utility (PLN) grid.
A common issue in remote areas is the lack of electricity supply from the main grid. Without a main grid connection, electricity cannot be effectively distributed, leaving communities unable to access modern technology.
To provide electricity to remote areas, an independent power supply system is required. An off-grid solar power system is one viable option.
In this article, Batari Energi discusses off-grid solar power systems and how they can supply electricity to the surrounding area.
What is an Off-Grid Solar Power System?
An off-grid solar power system is designed to meet electricity needs in locations beyond the reach of the main electrical grid or the national utility (PLN). The system is engineered to generate and store its own electricity supply independently.
Generally, off-grid systems require significant power capacity, as they must account for the energy needed to charge batteries for a full day of operation. The system stores generated electricity in batteries, ensuring power availability even when the grid is down.
How an Off-Grid Solar Power System Works
Broadly speaking, the operating principle of an off-grid solar power system involves capturing solar energy and converting it into electrical energy. Below is a detailed explanation of how the system functions.
Solar panels installed in an open area capture sunlight daily. Photovoltaic solar cells then convert this sunlight into direct current (DC) electricity.
The DC electricity from the solar panels passes through an off-grid inverter to be converted into alternating current (AC) electricity. AC electricity allows household electronic appliances to operate.
The electrical energy generated by the off-grid system is then split: a portion is used immediately, while the remainder is stored in batteries.
Electricity flows directly from the system to electronic devices, while the surplus is stored as a reserve in batteries for use at night.
When the battery's stored energy runs low or is depleted, the system collects solar energy to generate electricity once again.
Components of an Off-Grid Solar Power System
a. Solar Panel
Solar panels function by converting sunlight into electrical energy using the photovoltaic principle.
b. Solar Charge Controller
This device regulates the electric current flowing to the battery to prevent overcharging.
c. Battery
The battery stores the electrical energy generated during the conversion process. Batteries are necessary because off-grid solar power systems are not connected to the main electricity grid (such as PLN).
d. Inverter
An inverter is a component that converts electricity (typically DC from the panels) into AC power suitable for electrical needs. Additionally, the inverter can protect the battery from overcharging.
Differences Between Off-Grid and On-Grid Solar Power Systems
There are fundamental differences between off-grid and on-grid solar power systems. Here is a comparison you should know.
a. PLN Grid Connection
Off-grid solar systems do not need to be connected to the PLN grid. In contrast, on-grid systems operate while connected to the PLN grid.
b. Location
Off-grid systems are suitable for remote areas far from the PLN power grid. Conversely, on-grid systems require the user to be registered with PLN.
c. Equipment
Off-grid systems require batteries to store electrical energy derived from sunlight. On-grid systems, however, use an export-import (exim) meter to measure power exchange with PLN, allowing excess energy to be "banked" or credited.
d. Installation Costs
The installation process and components required for off-grid systems result in higher costs compared to on-grid systems. Generally, the installation cost of an off-grid solar system is four times that of an on-grid system.
Operational Costs of Off-Grid Solar Systems
Operational costs can be determined by the price of the batteries relative to the number of replacements required. For instance, consider a scenario involving four battery replacements. Thus, the operational costs for an off-grid solar PV system are as follows:
Operational costs
= Nb x battery cost
= 4 x Rp 73,600,000
= Rp 1,398,625
These represent only a few components, as there are other calculations involved, such as life-cycle costs and energy expenditure. These calculations become much simpler if you have a design scheme for the off-grid solar PV system.
Ideal Conditions for Off-Grid Solar Power System Installation
Off-grid solar power systems operate independently of the PLN electricity grid. Consequently, they are well-suited for remote areas, rural villages, and even plantation estates located far from the main power grid.
Adequate sunlight exposure is a crucial factor to consider. Open sites receiving direct sunlight meet the necessary criteria; locations with low sunlight intensity should be avoided.
Batari Energy Offers Off-Grid Solar Power System Installation Services
Are you interested in installing an off-grid solar power system? Batari Energy provides solar power system installation services (including off-grid solutions) across all regions of Indonesia.
Would you like to consult with us about off-grid solar power installation? Click this link!