Singapore has been actively promoting solar energy as part of its sustainability goals, with the government encouraging homeowners to adopt solar panels for home use. However, a key challenge of solar energy is its intermittent nature—solar panels only generate electricity when the sun is shining. This is where Energy Storage Systems (ESS) and grid-tied inverters come into play, helping homeowners optimise energy usage, manage power supply, and increase energy independence. In this article, we will take a closer look at the role of ESS and the benefits of a grid-tied ESS setup.
How ESS Works with Grid-Tied Inverters
Grid-Tied Inverters
A grid-tied inverter converts the direct current (DC) generated by solar panels into alternating current (AC), which is used by household appliances. It also synchronises with the national power grid, allowing excess energy to be exported under Singapore’s Enhanced Central Intermediary Scheme (ECIS), where excess solar energy is sold back to the grid.
ESS Integration
With ESS integration, homeowners can store surplus solar energy instead of exporting it at a lower rate.
- Charge Cycle: During peak sunlight hours, the inverter directs excess energy to the ESS, storing it for later use.
- Discharge Cycle: When solar generation is low (e.g., at night or on rainy days), stored energy is released back into the home.
The Role of ESS in Residential Solar Setups in Singapore
1. Maximising Energy Self-Consumption
Under Singapore’s SP Group electricity pricing, selling excess solar energy back to the grid is often less financially beneficial than using it directly. ESS allows homeowners to store and use their own solar energy, reducing reliance on grid electricity and lowering electricity bills.
2. Energy Independence & Backup Power
While Singapore has a reliable power grid, occasional outages can occur due to extreme weather or maintenance work. A solar setup with ESS and grid-tied inverters provides backup power for essential appliances, ensuring uninterrupted power supply during blackouts.
3. Supporting Grid Stability
With the rise of solar energy utilisation in Singapore, large amounts of solar power are being exported to the grid during peak generation hours. An ESS and grid-tied inverter setup reduces this strain by storing excess energy locally, helping to balance supply and demand and contributing to a more stable national grid.
4. Time-of-Use (TOU) Optimisation
Singapore’s electricity market allows homeowners to choose from different pricing schemes:
- Fixed Tariffs: ESS increases self-consumption, reducing reliance on grid power.
- Wholesale Market Pricing: With ESS, homeowners can store energy when rates are low (e.g., midday) and use it during peak pricing periods, saving money through energy arbitrage.
Benefits of a Grid-Tied ESS Setup in Singapore
- Seamless Integration: Grid-tied inverters efficiently manage both solar energy and grid electricity, ensuring a stable power supply.
- Smart Energy Management: Advanced software optimises battery charging, discharging, and grid interaction based on usage patterns.
- Scalability: Homeowners can start with a smaller system and expand the capacity of their ESS as energy needs grow.
- Future-Ready Homes: A grid-tied ESS setup prepares homes for increasing energy demands, including electric vehicle (EV) charging.
Home ESS Battery Size & Suitability for Singapore Homes
A home ESS battery size of 590 mm x 255 mm x 1230 mm can store up to 21 kWh of electricity—enough to power essential home appliances for several hours. Since Singapore homes, especially HDB flats, have space constraints, compact battery solutions may be more suitable. If you require an expert opinion, Solar panel specialists like Perry Management Clean Energy can recommend battery options suitable for different home types, including landed properties and condominiums.
ESS and Solar Panel Installation in Singapore
For those considering solar panels for their home, ESS does not need to be installed immediately. Modern solar inverters are battery-ready, meaning homeowners can add a battery later when they see the need for ESS integration. This flexibility allows for a phased investment in solar energy.
Challenges of ESS in Singapore
- Higher Initial Costs: Adding an ESS increases the upfront cost of a residential solar panel system. However, long-term savings from reduced electricity bills can offset this cost.
- Battery Lifespan: ESS batteries have a finite number of charge cycles and may require replacement after 10–15 years.
- Regulatory Considerations: In Singapore, ESS installations must comply with Energy Market Authority (EMA) guidelines to ensure grid stability and safety.
The Future of ESS in Singapore
With solar energy in Singapore becoming more utilised and battery costs decreasing, ESS is expected to become a standard component of residential solar panel setups. As electricity prices fluctuate, storing solar energy will become even more financially attractive.
The Singapore government’s push towards sustainable energy solutions, along with improvements in battery technology, will make ESS and grid-tied inverter setups a valuable addition to homes looking to achieve greater energy independence and efficiency.
The integration of ESS and grid-tied inverters in residential solar panel systems provides significant advantages, including energy cost savings, reduced reliance on the grid, and improved energy security. With Singapore’s focus on clean energy, ESS integration will play a crucial role in maximising the benefits of solar panels for home use.
Alongside the innovation of ESS and grid-tied setups, having a reliable residential solar panel system is just as important. Here at Perry Management Clean Energy, we specialise in high-quality solar solutions, with over 600 successful installations and counting. Our systems are built to last over 25 years, ensuring long-term savings for both residential and commercial clients.
For more information on our services or to schedule an appointment, please contact us today.
