80kW Energy Storage Inverter Comparison: Deye Vs. Solis Technical Performance & Market Positioning

In the 80kW energy storage inverter market, both Deye SUN-80K and Solis S6-EH3P-80K are mainstream grid-tied/off-grid hybrid models. While their core technical architectures share no fundamental differences, they exhibit distinct features in key performance areas such as system efficiency, battery management, and output quality.

A detailed comparison of these two products can provide deeper insights into the varied technical nuances of similar products in terms of design philosophy and application adaptability, thereby supporting more targeted decision-making for engineering selection and project deployment.

1    Comparison of Photovoltaic Input Systems

Technical Differences in Power Electronics Topology Design

Oversizing Capacity (Maximum PV Power and Number of Strings)

Deye's 1.6x oversizing (128kW) is at the mainstream level in the industry. It can well balance the initial investment and system peak-shaving losses in most projects, improving the actual operating efficiency and economy.

Solis' 2x oversizing (160kW) is more aggressive, suitable for occasions with limited land or roof resources but where "maximizing light utilization" is desired, such as some large-scale ground-mounted systems or multi-oriented roofs.

Number of MPPT Channels and Mismatch Tolerance

Deye: 6 MPPT channels, suitable for scenarios with uniform lighting conditions and simple string distribution.

Solis: 10 MPPT channels, which greatly enhances adaptability to projects with multi-orientation, complex shading layouts, and large cross-building setups, significantly reducing mismatch losses.

Current and Voltage Compatibility

Single-channel current: Solis' 42A design is compatible with the technical trends of N-type, bifacial, and high-current modules in recent years, providing redundancy and compatibility flexibility for system upgrades with technological evolution.

MPPT voltage range: Solis has a maximum of 950V, while Deye has 850V. This offers an advantage in subsequent compatibility with modules adopting high-rate long-string designs and high-voltage trends, and also gives system designers more room to optimize the number of series connections.

Safety and System Adaptability

Both have a maximum system voltage of 1000V, which is standardized and facilitates access to national standards and international mainstream power station specifications.

The consistent starting voltage ensures early grid connection under low-light conditions such as mornings and rainy days, increasing the total power generation duration.

Summary

Deye SUN-80K: Its photovoltaic input solution fully meets the needs of mainstream commercial/industrial and commercial energy storage systems. It is suitable for occasions with uniform lighting and standardized string configuration, featuring a compact structure, controllable costs, and high overall reliability.

Solis S6-EH3P-80K: It has obvious advantages in oversizing capacity and the number of MPPT channels, and offers better adaptability and profitability for expansion needs. It is suitable for large-scale distributed, multi-scenario industrial and commercial users with variable system requirements.

 

Deye SUN-80K

 

2    Comparison of Energy Storage Battery Interfaces

Voltage Window Width – Adaptability and Upgrade Flexibility

Deye (160-1000V)

It features an extremely wide voltage range, covering the broad spectrum of current mainstream and some low-voltage special solutions, as well as terminal battery technology upgrades. It is suitable for retrofitting/expanding old energy storage power stations and supports various systems such as some low-voltage lithium batteries, lithium iron phosphate batteries, and new solid-state batteries.

Solis (300-950V)

It mainly covers mainstream medium and high-voltage lithium iron phosphate/ternary lithium PACKs in the market with a voltage of 350V and above, focusing more on the current mainstream standards for large-capacity commercial and industrial applications, and its efficiency optimization is more targeted. For a single large-scale standard battery pack, Solis is more concise and efficient.

Current Capacity and Fast Charging Adaptability

Maximum Charging Current

Solis stands out with a maximum charging current of 200A, which meets the requirements of high-rate PACKs and extreme fast charging. Combined with grouping (2 channels at 100A each), it can also achieve load balancing and reduce the risk of failures.

Deye's 160A can already cover the needs of most commercial/industrial projects and most large-scale battery pack projects, and has advantages when dealing with single large-capacity battery packs.

Maximum Discharging Capacity

Deye's single-channel high current is suitable for single large-capacity/high-rate batteries.

Solis' dual channels are suitable for split-phase control and parallel connection of multiple battery packs, improving system flexibility and fault tolerance.

Number of Interfaces and Redundancy

Both are equipped with 2 interfaces, but Solis features completely independent physical grouping, which is beneficial for redundant backup, mixing of cells from different brands, or phased "new bring old" power stations (such as the utilization of  batteries); while Deye mainly focuses on parallel expansion.

Communication Protocols and Intelligent Compatibility

CAN/RS485 are mainstream BMS communication channels in commercial and industrial applications, enabling seamless connection with mainstream PACK and battery management system manufacturers on the market without communication compatibility issues.

Both brands can be flexibly integrated into EMS (Energy Management Systems), supporting future upgrades to intelligent/automated control.

Safety, Operation & Maintenance, and Future Expansion

High current combined with multi-channel management is crucial for system safety in terms of arc/transient protection, bus redundancy, and grid-connected/off-grid switching. Solis offers more room for redundancy and load balancing, while Deye focuses on optimizing for extreme large capacity.

Upgrade flexibility: It supports mixed expansion of old and new battery packs, echelon utilization, or replacement with new technology batteries in the future.

 

Solis S6-EH3P-80K

 

3    Comparison of Communication Output Performance

Technical Implementation of AC Side Performance

Difference between Active and Apparent Power & Reactive Power Support

Deye's 88kVA is greater than its rated active power, indicating that it has more margin in scenarios requiring reactive power support and nighttime grid compensation (such as large factories and places with high reactive loads at night).

Solis is rated at 80kVA, which is sufficient for mainstream industrial and commercial electricity usage scenarios and itself supports a high power factor of >0.99.

Harmonic and Unbalanced Output Capability

Both manufacturers have achieved excellent control of current harmonics below 3%, ensuring compatibility with modern high-end equipment and industries that cannot tolerate power supply pollution.

100% unbalanced output is particularly important for special application scenarios with actual three-phase asynchronous loads and single-phase overloads, eliminating the need for additional current equalizers or compensation devices.

Overload and Standby Capability

Solis features multi-level overload capacity, with no pressure at 2 times overload for a short period.

Deye simply specifies 1.5 times overload for 10 seconds, which covers most industrial occasions. Its control strategy is relatively stable without extreme and aggressive optimization.

Off-grid Capability and Power Quality

Solis has harmonics below 2% in off-grid mode, suitable for special scenarios with extremely high requirements.

Deye does not specifically list off-grid power quality, but it basically meets most actual occasions according to industry conventional standards.

Summary

Deye SUN-80K has the advantage of apparent power redundancy (88kVA), making it suitable for traditional industrial and commercial projects such as large factories with high demand for nighttime reactive power compensation, which need to balance power quality and economy.

Solis S6-EH3P-80K excels in high power factor, harmonic performance, stepped overload protection, and off-grid power quality guarantee.

 

MECC Hybrid Inverter

 

Single Phase/Split Phase/Three Phase Inverter to meet different using environment, with IP65/IP66 Protection Level

6KW Single Phase 220V Inverter

10KW Single Phase 220V Inverter

15KW Split Phase 120/240V Inverter

30KW Three Phase 380V Inverter

4    Comparison of Backup Power Supply Capability

Different strategies for backup power supply functions

Grid-tie/off-grid switching speed and compatibility with cloud and precision scenarios

Solis explicitly states a switching time of <10ms, which fully meets the requirement of non inductive power failure for UPS and even medical IT levels, and can be directly used in occasions with extremely high reliability such as data centers and operating rooms.

Deye does not explicitly specify the switching time. It is mostly 10ms according to industry practice, which can generally meet the needs of offices, dormitories, commercial and other occasions. However, for special sensitive loads, actual testing or manufacturer certification is recommended.

Overload capacity matching the diversity of actual loads

Solis adopts multi-level overload with strong impact resistance, which can withstand high-impact loads such as high-power motors, air conditioner start-stop, and welding machines for a short time, effectively avoiding system mis-tripping or fault shutdown.

Deye can handle 150% overload for 10 seconds, meeting industrial-grade stable loads and normal electrical start-stop. It can be used with confidence in projects without extreme requirements.

Power quality (THDv, voltage, frequency, etc.)

Solis provides detailed specifications for off-grid mode: THDv within 2%, voltage accuracy of 2%, and frequency fluctuation of 0.05Hz.

Deye does not explicitly specify but generally meets industry standards (THDv < 5%), which is safe for power and lighting loads.

Intelligent Battery Protection Strategy and Off-grid Duration

Solis features an intelligent strategy of hierarchical alarm load reduction delayed shutdown, which maximizes battery output to ensure critical load endurance while effectively avoiding over-discharge damage.

Deye uses traditional low-voltage power cutoff, with a simple structure and direct control, suitable for general scenarios but less sophisticated than Solis in extreme power supply situations.

Multi-unit Parallel Operation and Expansion Flexibility

Both support multi-unit parallel off-grid operation for MW-level capacity expansion. However, Solis' active current sharing technology is more suitable for scenarios with large load fluctuations and complex power consumption structures.

Generator Linkage Automation and Energy Coordination

Solis modules come with automatic generator start-stop and connection management, ideal for isolated grid operation, unattended sites, and smart microgrids.

Deye requires manual switching, suitable for projects with regular inspections and manual operation.

Summary

Solis S6-EH3P-80K is suitable for projects with higher requirements on power-off switching time, power quality, overload capacity and intelligence. It has strong protection capability, intelligent control strategies and high expansion adaptability.

Deye SUN-80K is more oriented to conventional industrial and commercial places, such as office buildings, schools, ordinary factories, industrial parks, etc. It has a stable structure and high cost performance, meeting mainstream applications. For special scenarios (high precision, extreme impact, large-scale microgrids), it is recommended to verify the relevant performance on site.

5    System efficiency comparison

Technical Level of System Efficiency

Maximum efficiency (e.g., 98.7% for SUN-80K and 97.6% for S6-EH3P-80K) refers to the conversion efficiency of the inverter under optimal conditions and at the ideal input power point.

Engineering significance: This value reflects the "peak performance" of the equipment. Maximum efficiency determines the "upper limit of capability" and is more suitable for screening high-performance devices.

Practical impact: During excellent periods such as midday and high sunshine, this parameter helps obtain more peak power generation. For factories, industrial parks, and distributed power stations that operate under high loads and high power generation for a long time, inverters with high maximum efficiency will bring a continuous small increase in benefits.

European efficiency (e.g., 98.1% for SUN-80K and 97.2% for S6-EH3P-80K) is a weighted average efficiency considering various light intensities throughout the day (mixed working conditions of partial load and rated load), which is more in line with real operating conditions.

Engineering significance: It reflects the overall performance of the inverter under non-full power generation conditions such as different weathers, morning/evening, and cloudy days. European efficiency directly determines the level of actual annual power generation/energy consumption benefits and is one of the most important indicators for the annual economy of the system.

Practical impact: Most industrial and commercial photovoltaic/energy storage systems operate at less than full load for 80% or even 90% of the year. At this time, European efficiency determines the actual total annual power generation/discharge of the system. For systems with large capacity (especially large-scale industrial parks and optical storage integrated projects), every 0.5~1% increase in European efficiency will significantly improve the cumulative annual power generation benefits and reduce the cost per kilowatt-hour.

Deye is higher than Solis in both maximum efficiency and weighted efficiency, which will bring an increase in annual cumulative power generation, and is obviously more advantageous especially in scenarios where power generation side benefits are evaluated.

Summary

Deye SUN-80K: With better comprehensive efficiency, it is suitable for large-scale and long-term industrial and commercial energy storage projects.

Solis S6-EH3P-80K: Suitable for projects involving high-frequency battery charging and discharging.

6    Comparison of Physical Characteristics and Environmental Adaptability

Lightweight and Compact vs. Spacious Design:

Deye features high power density, which means a high level of component integration and more stringent requirements for heat dissipation and electromagnetic compatibility design. However, it offers the advantages of flexible equipment arrangement and lower transportation and hoisting costs.

Solis has a larger volume and weight, with ample spacing for internal component placement and heat dissipation. This is beneficial for thermal stability and reliability during long-term operation but imposes higher requirements on the load-bearing capacity of the distribution room foundation and installation space.

Environmental Adaptability:

Deye's lower limit of -40°C is quite prominent, providing a significant advantage in extremely cold regions and high-altitude areas with extreme low temperatures.

Solis' IP66 protection rating offers better risk resistance in special environments such as coastal areas, dusty regions, and saline-alkali areas, preventing safety hazards like dust accumulation and electrical corrosion. Deye, on the other hand, has an IP65 rating.

Engineering Implementation Considerations:

Weight and dimensions directly affect the convenience of on-site handling, hoisting, maintenance, and replacement. Deye's 105kg inverter can generally be handled by two to three people with standard hoisting tools, while Solis' 170kg inverter is more suitable for high-intensity continuous operation.

Summary

Deye SUN-80K excels in compactness, high efficiency, and friendliness to extreme low temperatures, making it very suitable for distributed energy, outdoor highly integrated projects, and projects in extremely cold regions.

Solis S6-EH3P-80K is superior in extreme environment protection and structural redundancy.

7    Comparison of System Functions and Interfaces

Human-Machine Interaction and Engineering Maintenance

Deye adopts a combination of LED indicators and simple buttons, focusing on remote monitoring and batch automatic operation and maintenance scenarios. It is suitable for projects with large scales and strong automatic operation and maintenance capabilities, which helps control costs and reduce the risk of misoperation.

Solis is equipped with a 7-inch touch screen, providing a rich local interface and log browsing, which is convenient for on-site engineers to debug and locate faults, and also facilitates training and handling of special working conditions.

Communication Protocols and Remote Access

Both support industrial standard RS485/CAN, with good compatibility with mainstream EMS/BMS/upper computers, ensuring the integration of multiple systems such as energy storage/photovoltaics/fire protection.

Solis comes with Ethernet as standard, suitable for parks, data centers and other sites with multiple terminals and large data volumes. IP-based communication improves system security and scalability.

In terms of wireless communication, Deye offers more protocol options, which is beneficial for mountainous areas/decentralized layouts and enables convenient mobile debugging. Solis focuses on cellular, Bluetooth and WiFi to meet the needs of intelligence and mobile portability.

Multi-Energy and Microgrid Adaptability

Deye is equipped with standard interfaces for photovoltaic-storage and diesel generators, covering traditional photovoltaic-storage-diesel applications.

Solis' SMARTLOAD/GEN/INV three physical interfaces, as well as functions such as intelligent load priority and generator signal management, enable it to be compatible with more complex or new industrial and commercial scenarios.

Large-capacity Parallel Operation and Centralized Monitoring

Both support parallel operation of up to 10 inverters to meet the needs of MW-level projects, and are equipped with centralized converging and unified EMS regulation.

They support the standard Modbus protocol, enabling seamless access to the power station's EMS and third-party energy management systems, facilitating intelligent expansion in the later stage.

Local Intelligent Management and Functional Details

Solis emphasizes the coordination of electrical systems such as intelligent local load priority, independent energy distribution, and generator management, which is convenient for automatic strategy switching and self-healing of power stations in extreme situations.

Deye attaches importance to the access of standardized external instruments, weather stations, etc., and emphasizes the consistency of monitoring data and independent system analysis.

Summary

Deye SUN-80K focuses on the richness of communication interfaces and system integration compatibility, featuring low cost and high reliability.

Solis S6-EH3P-80K has strong human-computer interaction and local management capabilities, with outstanding adaptability to multi-energy scenarios, making it more convenient for on-site advanced operation and maintenance and new multi-energy microgrid applications.

8    Design concept of product form

The 105kg weight and compact size of Deye SUN-80K reflect the pursuit of power density, a design that helps reduce transportation and installation costs. The 170kg weight and larger size of Solis S6-EH3P-80K provide more space for the layout of internal components and heat dissipation design, which may be beneficial to improving product reliability.

Deye's low-temperature working capability of -40°C is a prominent technical feature, which is of great value for applications in cold regions. Solis' IP66 protection rating is higher than Deye's IP65, resulting in stronger protection capability in harsh environments.

Differentiation in system integration capability

Solis' 7-inch LCD touch screen and multi-energy management interfaces reflect the emphasis on system integration and user experience, and these functions have practical value for system integrators and operation and maintenance personnel. Deye's LED indicator design is relatively simple, but it can also meet the basic status display needs.

In terms of communication interfaces, Deye marks more interface type options, while Solis specifically marks the Ethernet interface. Both configurations can meet different communication needs.