Hoymiles HoyUltra 2 Sets New Standard for Silent C&I Energy Storage with ≤60 dB Certification

As commercial and industrial energy storage systems (ESS) expand into urban environments, noise levels have become a critical factor for project approval. From commercial centers to residential-adjacent installations, developers must now meet strict acoustic requirements alongside performance and safety standards.

The Hoymiles HoyUltra 2 (HESS-261-2h) has achieved a major milestone, securing ≤60 dB(A) noise level certification under the ISO 3744:2010 standard, positioning it among the quietest C&I battery storage systems in the industry.

Certified Silence: ≤60 dB vs Industry Standard 65–75 dB

Typical commercial energy storage systems operate between:

• 65–75 dB(A) (comparable to loud conversation or office noise)

The HoyUltra 2 delivers:

• ≤60 dB(A) certified noise level
• Measured 47.4 dB(A) under operational conditions
• Comparable to a quiet library or calm indoor environment

This significant reduction opens new deployment opportunities in noise-sensitive locations.

Tested Under ISO 3744:2010 – Real Acoustic Validation

The noise evaluation was conducted by the Zhejiang Electric Safety and Quality Inspection Center, following ISO 3744:2010 standards.

Key testing conditions:

• Professional semi-anechoic chamber
• Background noise: 24 dB (quieter than a bedroom at night)
• Full-cycle testing including:
  • Maximum charge
  • Maximum discharge
  • Continuous operation

Results confirmed:

• Stable low noise even at full load
• No mechanical hum or fluctuation
• Consistent acoustic performance

Why Low Noise Matters in C&I Energy Storage

Noise is increasingly a project approval barrier in:

• Urban commercial districts
• Mixed-use developments
• Residential-adjacent installations
• Industrial parks with environmental restrictions

Lower noise enables:

• Faster permitting approval
• Wider installation flexibility
• Reduced community resistance
• Compliance with local regulations

Seamless Integration in Urban & Commercial Environments

With noise levels as low as 47.4 dB(A), HoyUltra 2 is ideal for:

• Commercial business centers
• Logistics hubs near residential zones
• Office complexes
• Industrial parks
• Urban solar + storage projects

This makes it a strong solution for space-constrained and regulation-sensitive deployments.

Liquid Cooling: The Key to Silent Performance

The HoyUltra 2 achieves its low-noise performance through a fully liquid-cooling architecture, eliminating the need for high-speed fans common in air-cooled systems.

Key Engineering Advantages:

🔹 Multi-Dimensional Noise Suppression

• Optimized airflow design
• Reduced internal turbulence
• Efficient heat exchange without acoustic penalty

🔹 Intelligent Fan & Compressor Control

• Adaptive speed regulation
• Avoids unnecessary high RPM operation
• Balanced performance vs noise output

🔹 Fully Liquid-Cooled Design

• Fewer moving components
• Reduced vibration
• Lower acoustic emission at source

🔹 Acoustic-Integrated Design Philosophy

• Noise control integrated at design stage
• Structural alignment with acoustic performance
• System-level quiet engineering

High Performance Beyond Silence

The HoyUltra 2 is not only quiet — it is engineered for high performance:

• Round-trip efficiency: up to 90.3%
• Full-capacity operation at 50°C (no derating)
• IP55 protection rating
• 3-level, 6-type safety protection system
• Edge EMS with local APP for monitoring and O&M

This combination ensures reliable performance in demanding commercial environments.

Ideal Applications

The HoyUltra 2 is particularly suited for:

• Urban C&I solar + storage projects
• Commercial buildings near residential zones
• Industrial parks with noise limits
• Grid-support battery installations
• High-temperature operating environments

Solar&Solar Perspective: Noise Is Now a Key Procurement Factor

In today’s European and global markets, project developers increasingly evaluate:

• Acoustic performance
• Environmental compliance
• Community impact
• Installation flexibility

Low-noise ESS solutions provide a competitive advantage in:

• Tender approvals
• Urban project pipelines
• Mixed-use developments

The HoyUltra 2 addresses a growing market demand where performance alone is no longer enough — silence matters.

Conclusion: Removing the Noise Barrier in Energy Storage

The Hoymiles HoyUltra 2 sets a new benchmark for commercial energy storage by combining:

• ≤60 dB certified noise performance
• Fully liquid-cooled architecture
• High efficiency and thermal stability
• Urban deployment readiness

By removing the “noise barrier,” it enables energy storage systems to expand into environments where traditional solutions struggle.

Quiet, powerful, and engineered for modern energy infrastructure — HoyUltra 2 redefines what C&I storage can achieve.

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