Off-grid solar inverters are always a necessity in resolving power instability. The power grids in the majority of countries and regions not only experience massive voltage fluctuation, but power outages occur frequently. With the development of inverter technology that has been speeding up, most off-grid inverters on sale today come with the ability to interface with the mains. They will seamlessly switch to the mains when the photovoltaic power generation is poor or battery charge is low, thus ensuring better power stability and security.
But in the areas of poor grid stability, the mains priority mode is not the absolute solution and may even introduce new hazards to the system.
Risks of Unstable Power Grids
- Overvoltage or Undervoltage
In a nominal 220V mains installation, if voltage fluctuates to 170V or even 250V for a prolonged period, the inverter will keep switching to battery power, causing switching confusion and even protection shutdowns. Severe overvoltage can also burn out the inverter motherboard and connected load devices. - Flickering Power Outages and Restorations
In some areas with extremely unstable grids, power outages can occur multiple times a day. With every power outage, the inverter switches over to battery and switches back to mains once the grid is restored. Every such switching results in component stress and a reduction in the lifespan of the devices. Even more subtly, the temporary grid restoration is typically followed by high-energy surge currents, powerful enough to annihilate critical inverter components. - Harmonic Distortion and Frequency Instability
If the grid waveform is distorted or the frequency deviations are outside the specified range, the inverter may lose synchronization with the mains, leading to switchover failure or fault messages. In extreme cases, even sensitive loads may refuse to operate.
Recommended Reasonable Operating Modes
Off-grid inverter systems have their appeal mainly in the fact that they can and do operate independently of the grid, harnessing renewable solar energy for their own use. In locations where grid conditions are unstable, mains power should be considered an emergency supplement rather than a source of primary energy.
Huijue Group recommends:
- Use PV Priority mode during the day: Maximize solar power generation, use excess power to charge the energy storage battery, and reduce reliance on mains power.
- Use Battery Priority mode at night or on cloudy days: Discharge stored energy as fast as possible and use mains power when battery charge drops to a certain threshold.
- In cases where Utility priority mode assumes the grid is stable, it promptly reverts to PV or Battery Priority mode after the battery is fully charged.
Huijue Equipment Advantages
In order to address the complex grid conditions, Huijue Group's 10-12kW three-phase low-voltage off-grid inverter is especially designed for high-power residences and small businesses to ensure stable running even under harsh grid conditions.
Key Highlights:
- High-Efficiency Performance: The advanced MPPT technology ensures a high efficiency of up to 99.9% with a maximum 22+22A PV input current to ensure full utilization of maximum power output.
- High Load Capacity: Up to 72kW maximum load capacity, capable of easily handling critical loads such as air conditioners, refrigerators, and servers.
- Broad Safety Protection: Comprehensive hardware and software protection, compliant with a broad spectrum of international safety certifications.
- Intelligent Battery Management: Lithium-ion battery BMS communication support and a single dual-activation functionality, offering up to 260A charging capacity.
- Smart Energy Saving: Built-in time-of-use functionality can adapt operating modes to match electricity pricing plans for reduced operating costs.
By these advantages, Huijue group's energy storage solution not only helps customers acquire uninterruptible and stable power supply during unstable grid conditions, but also makes it possible to extend the lifespan of inverter and storage batteries in an efficient manner while guaranteeing good energy security for residential and commercial users worldwide.
