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 sales@gsl-energy.com     0086 13923720280

When the system displays a "Soft Start Fault" alarm, what should I do?

2026-02-06
A "Soft Start Fault" alarm is typically triggered when abnormal voltage is detected on either the AC or DC side during system power-up. If this alarm occurs, please follow the troubleshooting steps below:
Check Grid Voltage Fluctuations
Verify whether the grid-side voltage is stable and whether there are significant fluctuations or momentary power outages. Abnormal grid voltage may prevent the system from performing a normal soft start.
Check Photovoltaic (PV) Voltage
Confirm whether the output voltage of the PV modules exceeds the maximum allowable limit for the device:
For three-phase systems: PV voltage must not exceed 1000 V
For single-phase systems: PV voltage must not exceed 600 V
If the PV voltage exceeds the limit or the grid is unstable, resolve these issues first before attempting to restart the system.
GSL ENERGY recommends that during any soft start fault troubleshooting, always prioritize checking the voltage source and fluctuations to ensure safe system startup and protection of the energy storage equipment.
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Related questions
1
Can the system provide bespoke energy storage solutions?

Yes, GSL ENERGY delivers comprehensive customised energy storage solutions encompassing ODM, OEM, and OBM services. Our bespoke process adheres strictly to enterprise-level project management protocols, incorporating the following key stages:

Requirement Communication – Thoroughly understanding the client's application scenarios, capacity requirements, environmental conditions, and specialised functional specifications.

Solution Design – Delivering professional battery system designs tailored to client requirements, including cell selection, BMS configuration, thermal management solutions, and aesthetic customisation.

Manufacturing – Strict adherence to quality control standards within our facilities ensures stable and reliable battery performance, meeting IEC, CE, UN38.3, and other certification requirements.

Installation & Commissioning – Providing on-site or remote installation guidance and system commissioning to ensure seamless compatibility and efficient operation with existing equipment.

After-Sales Support – Technical training, maintenance guidance, and warranty services are provided to safeguard the customer's long-term user experience.

Our bespoke solutions demonstrate significant advantages in success rates, customer satisfaction, and performance compliance. We have reliably served numerous residential energy storage, commercial/industrial, and microgrid clients, achieving optimised energy management and maximised return on investment.

For further details regarding the customisation process or to obtain a solution quotation, please contact a GSL ENERGY account manager directly for personalised support.

4
How to Select the Appropriate Capacity for a Domestic Energy Storage System?
The core consideration in selecting the capacity for a domestic energy storage system lies in avoiding both insufficient capacity, leading to inadequate backup duration, and excessive capacity, resulting in prolonged investment payback periods. Therefore, systematic calculations should be based on daily actual electricity consumption, peak-off-peak pricing strategies, and photovoltaic generation capacity. The solution involves determining the optimal capacity range through structured data evaluation. This entails collecting electricity bills and consumption curve data spanning 6–12 months, analysing average daily kWh usage, peak loads, and critical backup load proportions. Capacity matching is then performed by integrating average daily PV generation with time-of-use tariff arbitrage requirements. Implementation typically follows these steps: data collection → load analysis → setting backup hours and available depth of discharge → calculating nominal battery capacity → conducting simulation validation. This process must account for battery cycle life and reserve capacity for future load growth; Evaluation metrics include energy storage coverage (proportion of daily electricity consumption covered by batteries), peak-valley reduction effectiveness, annual electricity cost savings, system utilisation rate, and return on investment (ROI). This ensures the system achieves optimal long-term economic benefits while prioritising electrical safety and stability.
6
How is the battery system's performance in low temperatures during winter?

Low ambient temperatures in winter can significantly impact battery charging efficiency, available capacity, and long-term lifespan if not properly managed; the core challenge is that lithium batteries experience increased internal resistance and reduced charge acceptance at sub-zero temperatures, which may trigger protection mechanisms or limit usable energy output. The solution implemented in GSL ENERGY battery systems, for both residential and commercial & industrial applications, is an integrated heating protection strategy combined with an intelligent Battery Management System (BMS) that continuously monitors cell temperature and automatically delays charging when temperatures fall below safe thresholds.
During low-temperature conditions, the system activates built-in heating elements or temperature control modules to raise the battery to an optimal operating range before permitting charge cycles, thereby preventing lithium plating and capacity degradation. Implementation involves ensuring the battery is installed in a ventilated yet sheltered environment, enabling temperature monitoring through the inverter or EMS platform, configuring appropriate SOC and charge current parameters for winter operation, and verifying that firmware and BMS protections are properly updated.
Performance evaluation metrics include cold-weather charge acceptance rate, discharge stability under load, internal temperature uniformity, system alarm frequency, state-of-health retention after winter cycles, and overall round-trip efficiency compared to standard temperature benchmarks, ensuring reliable, safe, and economically optimized operation throughout the winter season.

More knowledge about low-temperature storage:

https://www.gsl-energy.com/how-does-gsl-energy-liquid-cooling-energy-storage-system-operate-stability-in-ukraine-s-cold-winter.html

https://www.gsl-energy.com/winter-storms-low-temperatures-how-to-ensure-your-energy-storage-system-remains-reliable.html

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