For remote sites, plantations, islands and facilities where grid access is unavailable or costly, an off grid solar system can provide independent electricity using solar panels, battery storage and, where needed, backup generation.
Key Takeaways
An off grid solar system is a standalone electricity system that operates independently of the national utility grid. Instead of relying on TNB when solar generation is insufficient, the system combines solar PV panels, battery storage, an inverter and, where necessary, a backup generator to provide electricity day and night.
During daylight hours, solar panels generate electricity for the property’s immediate needs while surplus energy charges the battery. At night or during periods of low sunlight, stored battery energy supplies the required power. A backup generator may also be incorporated for prolonged cloudy weather, unusually high demand or critical loads that cannot tolerate interruption.
In Malaysia, off grid solar systems are particularly relevant for plantations, farms, islands, telecom sites, eco-resorts, remote buildings and rural locations where grid connection is unavailable, unreliable or more expensive than installing an independent energy system.
In simple terms:
Sunlight → Solar Panels → Inverter → Property Loads → Battery Storage → Backup Generator when required
Unlike a conventional grid-connected solar installation, an off grid system must be designed to meet both the property’s daily electricity consumption and periods when solar generation is lower than expected.
A reliable off grid solar power system requires several components working together as one energy system.
| Component | Purpose |
|---|---|
| Solar PV panels | Generate DC electricity from sunlight |
| Battery Energy Storage System (BESS) | Stores electricity for nighttime and low-sunlight periods |
| Off-grid or hybrid inverter | Converts DC electricity into usable AC power and manages energy flow |
| Charge management system | Controls battery charging and helps protect battery health |
| Electrical protection equipment | Provides safe isolation and protection for the solar installation |
| Energy monitoring system | Tracks solar generation, battery status and electricity consumption |
| Backup generator | Provides additional electricity during prolonged low-solar periods or unusually high demand |
| Mounting and cabling | Secures and connects the complete PV installation |
An off grid solar system should be designed around the site’s actual energy demand. Key factors include daily electricity consumption, peak load, nighttime usage, available solar generation, battery capacity and required backup duration.
Because there is no grid supply to cover a shortfall, Ray Go Solar assesses the site’s load profile and operating requirements before determining the appropriate solar, battery and backup capacity.
Battery storage is one of the most important parts of an off grid solar system because there is no utility grid available as a backup source.
The battery must store enough electricity to support nighttime consumption and provide an appropriate reserve for periods of poor weather. For this reason, battery capacity should be calculated together with solar array size, peak demand and required backup duration rather than selected separately.
Ray Go Solar provides Battery Energy Storage System solutions that can be integrated into suitable solar applications based on the site’s load profile and operational requirements.
| System Type | Grid Connection | Backup During Outage | Typical Use Case |
|---|---|---|---|
| Grid-Tied | Fully connected | No (shuts down for safety) | Most homes and businesses in Malaysia |
| Off-Grid | None | Yes (fully self-sufficient) | Remote sites, islands, plantations |
| Hybrid | Connected + battery | Yes (via battery) | Homes and businesses seeking backup power without full energy independence |
Off-grid solar systems function as standalone power plants for your property, combining solar panels, battery banks, and controllers to deliver continuous power with zero grid dependence — a setup particularly valuable for remote facilities where grid connection costs would otherwise exceed the cost of solar installation itself.
Grid-connected SELCO systems operate in parallel with the utility network but are designed for self-consumption, with excess solar generation prevented from being exported to the grid. They’re generally cheaper to install but offer no power during a blackout, since grid-tied inverters are designed to disconnect automatically for safety.
Hybrid systems blend the two: grid-connected, but with battery backup layered in, offering some resilience without the full cost of going completely off-grid.
Read more: On-Grid vs Off-Grid vs Hybrid Solar Systems Further Explained
Off-grid solar is most relevant wherever national grid connection is too costly, too slow to reach, or technically impractical. Common applications include:
The cost of an off-grid solar system in Malaysia varies significantly from one project to another. Unlike grid-connected solar systems, off-grid installations require energy storage and backup capabilities, making it difficult to provide a single “RM per kW” price. The overall investment depends on the site’s energy consumption, reliability requirements, and operating conditions.
Key factors that influence the cost of an off-grid solar system include:
For remote projects, the correct comparison is often not “off-grid solar versus grid-connected solar”, but rather “off-grid solar versus the cost of extending grid infrastructure and continuing to operate diesel generators.”
This comparison is especially important for plantations, resorts, agricultural operations, telecommunications sites, and other remote facilities. In many cases, an off-grid solar system can help reduce long-term fuel costs, minimise generator dependence, lower maintenance expenses, and provide a more sustainable and predictable energy solution where grid access is limited or costly to obtain.
Before deciding which route makes sense for your property or site, it helps to work through a few fundamentals:
An off-grid solar system operates with zero connection to the national grid, relying entirely on batteries (and often a backup generator) for continuous power. A grid-tied system stays connected to TNB and draws grid power when solar output is insufficient, but shuts down automatically during outages.
Generally, yes. Off-grid systems require larger solar arrays and substantial battery storage to operate independently, which raises upfront costs compared to a grid-tied installation. However, for sites where grid connection is costly or unavailable, off-grid can be the more economical option overall.
In many cases, yes — though most well-designed off-grid systems still include a generator as backup for extended low-sunlight periods. The goal is typically to drastically reduce generator run-time and fuel consumption, not necessarily eliminate it entirely.
Yes, an off grid solar system can power an entire property if it is correctly sized, but it becomes increasingly expensive as electricity demand and required backup duration increase.
A small chalet, telecommunications installation or remote agricultural facility may be relatively straightforward to support. A large commercial operation with high-power machinery, air-conditioning or 24-hour processes will require significantly more PV capacity, battery storage and potentially generator backup.
For larger sites, Ray Go Solar should therefore compare fully off-grid, hybrid and grid-connected alternatives before recommending a configuration.
Yes, battery storage is normally essential because an off grid system cannot draw electricity from the utility grid when solar panels are not generating sufficient power.
Choosing the right off grid solar system requires more than selecting panels and batteries. With over 13 years of solar EPCC experience in Malaysia, Ray Go Solar assesses your load profile, solar potential, battery needs and backup requirements to recommend the most suitable off-grid, hybrid or grid-tied solar panel system. Contact our team for a technical assessment before you proceed.
