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HELIOS ESS 16 kWh Lithium Battery System
Professional Energy Storage for Residential, Off-Grid Applications
Engineered for installers, EPCs, and system integrators
The HELIOS ESS delivers 16 kWh of lithium iron phosphate (LiFePO4) energy storage in a wall-mounted, outdoor-rated enclosure designed for professional solar installations. With 10kW continuous power output and 200A charge/discharge capability, this system handles demanding off-grid, backup, and distributed energy applications.
Built with a 4th generation Battery Management System and comprehensive UL certifications, HELIOS ESS offers reliable performance from -25°C to 55°C. The scalable architecture expands up to 579.6 kWh across multiple units, making it suitable for residential backup systems through light-commercial installations. Direct compatibility with Sol-Ark 15K inverters is supported through closed-loop CAN communication and an optional conduit box for clean, secure cable management and enhanced installation safety.
IP65-rated outdoor enclosure with integrated wall mounting system
HELIOS ESS 16 kWh Lithium Battery System
Professional-grade energy storage with 4th generation BMS, IP65 outdoor rating, and seamless inverter integration. Designed for installers seeking reliable, scalable battery solutions for off-grid, backup, and distributed energy applications.
Download Helios ESS Data SheetCost Effective
High energy density delivers 16 kWh per unit, reducing cost/kWh for your projects.
High Performance
10kW continuous, 19kW peak power with 200A charge/discharge capability.
UL Certified Safety
UL 1973, UL 9540A certified with dual fire arrestors and comprehensive protection.
Easy Installation
Wall-mount design with quick-connect cables and pre-wired parallel kits.
All-Weather Durability
IP65 outdoor rating with built-in heating system for -25°C to 55°C operation.
Scalable Architecture
Expandable up to 579.6 kWh with 36 modules for growing energy demands.
Seamless Integration
Direct CAN communication with popular inverters, Sol-Ark 15K compatible.
Proven Reliability
10-year warranty with 93 MWh energy throughput performance guarantee.
Helios ESS Specifications
| Specification | Value |
|---|---|
| Model | HELIOS ESS |
| Model Number | 52-48-16000 / 900-0077 |
| Energy Capacity | 16,080 Wh (16.1 kWh) |
| Nominal Voltage | 51.2 V |
| Nominal Capacity | 314 Ah |
| Max Continuous Power | 10.24 kW |
| Peak Power | 19 kW (10 seconds) |
| Max Charge/Discharge Current | 200A continuous, 300A peak (15 sec) |
| Operating Temperature | -25°C to 55°C (-13°F to 131°F) |
| Chemistry | Lithium Iron Phosphate (LiFePO4) |
| Dimensions | 35.43" H x 18.31" W x 9.72" D |
| Weight | 299.83 lbs (136 kg) |
| IP Rating | IP65 (Outdoor) |
| Certifications | UL 1973, UL 9540A, UN38.3 |
| *Compatible with: Sol-Ark 15k Hybrid Inverter | |
Helios ESS Components
HELIOS ESS Battery Module
16 kWh, 314 Ah, 51.2V lithium battery with 10kW continuous power and 10-year warranty. Wall-mountable with IP65 outdoor rating.
Sol-Ark 15k Conduit Box
Designed for seamless integration with Sol-Ark 15K inverters. Provides clean, secure cable management and enhanced safety.
Cables & Connector Sets
Pre-sized battery-to-battery and inverter cable sets with quick-connect terminals. Available in 2/0 and 1/0 AWG configurations.
Lifting Handle Set
Heavy-duty ergonomic handles for safe positioning during installation. Includes left and right handles for balanced lifting.
LYNK II Gateway
Enables closed-loop communication with SMA, Sol-Ark 15K and other inverters. Required for LYNK Cloud integration and device control.
LYNK CLOUD
Remote monitoring platform for system performance tracking, programmable relay controls, and real-time data access via web interface.
System Configurations for Residential and Light Commercial Installations
These standard configurations provide accurate part numbers and quantities for typical HELIOS ESS deployments in residential and light-commercial applications. Custom configurations can be designed to meet specific project requirements.
Single Module System
| Part Number | Description | QTY |
|---|---|---|
| 52-48-16000 | HELIOS ESS Battery 16.1 kWh 51.2V 314 Ah Outdoor | 1 |
| 950-0067 | Sol-Ark 15k Conduit Box - (No Cables) | 1 |
| 950-0068 | Parallel Battery To Battery Cable Set | 0 |
| 950-0070 | Battery To Inverter Cable Set - (2-Pos, 2-Neg 2/0 1.0m) | 1 |
| 950-0071 | Battery To Inverter Cable Set - (2-Pos, 2-Neg 1/0 1.0m) | 1 |
| 950-0069 | Battery Module Lift Handle Set | 1 |
| 950-0072 | Battery Connector Set - (1-Pos, 1-Neg) | 1 |
| 950-0025 | LYNK II Communication Gateway | 1 |
Optional Items: (a) If 2/0 AWG is oversized (b) If lifting assistance needed (c) If longer cables required (d) Required for LYNK Cloud integration
Dual Module System
| Part Number | Description | QTY |
|---|---|---|
| 52-48-16000 | HELIOS ESS Battery 16.1 kWh 51.2V 314 Ah Outdoor | 2 |
| 950-0067 | Sol-Ark 15k Conduit Box - (No Cables) | 2 |
| 950-0068 | Parallel Battery To Battery Cable Set | 1 |
| 950-0070 | Battery To Inverter Cable Set - (2-Pos, 2-Neg 2/0 1.0m) | 1 |
| 950-0071 | Battery To Inverter Cable Set - (2-Pos, 2-Neg 1/0 1.0m) | 1 |
| 950-0069 | Battery Module Lift Handle Set | 1 |
| 950-0072 | Battery Connector Set - (1-Pos, 1-Neg) | 1 |
| 950-0025 | LYNK II Communication Gateway | 1 |
Optional Items: (a) If 2/0 AWG is oversized (b) If lifting assistance needed (c) If longer cables required (d) Required for LYNK Cloud integration
Triple Module System
| Part Number | Description | QTY |
|---|---|---|
| 52-48-16000 | HELIOS ESS Battery 16.1 kWh 51.2V 314 Ah Outdoor | 3 |
| 950-0067 | Sol-Ark 15k Conduit Box - (No Cables) | 3 |
| 950-0068 | Parallel Battery To Battery Cable Set | 2 |
| 950-0070 | Battery To Inverter Cable Set - (2-Pos, 2-Neg 2/0 1.0m) | 1 |
| 950-0071 | Battery To Inverter Cable Set - (2-Pos, 2-Neg 1/0 1.0m) | 1 |
| 950-0069 | Battery Module Lift Handle Set | 1 |
| 950-0072 | Battery Connector Set - (1-Pos, 1-Neg) | 1 |
| 950-0025 | LYNK II Communication Gateway | 1 |
Optional Items: (a) If 2/0 AWG is oversized (b) If lifting assistance needed (c) If longer cables required (d) Required for LYNK Cloud integration
Helios ESS Off-Grid Applications
Whole Home Backup Systems
Comprehensive power protection for entire residential properties during extended outages. Scalable battery systems automatically maintain full household operation including HVAC, major appliances, and all circuits, providing seamless transition from grid power with multi-day runtime capability.
Off-Grid Cabins & Remote Properties
Complete energy independence for properties without utility grid access. Battery storage systems paired with solar panels provide reliable 24/7 power for lighting, appliances, and communication systems in remote locations where traditional grid connection is unavailable or prohibitively expensive.
Microgrid Applications
Distributed energy networks for communities, commercial facilities, and critical infrastructure. Battery storage systems enable localized power grids that can operate independently from the main utility grid or seamlessly integrate with it, providing resilient electricity for hospitals, schools, military installations, and remote communities.
Lithium vs. Lead Acid Battery Comparison
Lithium Iron Phosphate (LiFePO4) Batteries
Advanced lithium technology delivers superior performance, longevity, and efficiency for energy storage applications. LiFePO4 chemistry provides the safest lithium option with exceptional cycle life and thermal stability.
Examples of LiFePO4 Batteries: Helios ESS, Deka Duration DD5300, Enphjase IQ Battery 10C, Homegrid Stackd Series, PointGuard Home
Pros:
- 10+ year lifespan with 6,000+ charge cycles
- 90-95% depth of discharge without damage
- Maintenance-free operation
- Lightweight - 60% less weight than lead acid
- Fast charging capability (200A+ charge rates)
- Wide temperature range (-25°C to 55°C)
- Consistent voltage output throughout discharge
Cons:
- Higher upfront investment cost
- Requires compatible charging systems
- performance can degrade in freezing temperatures.
- lithium batteries are subject to stricter shipping regulations
Lead Acid Batteries
Traditional battery technology using lead plates and sulfuric acid electrolyte. Available in flooded, AGM, and gel configurations, lead acid batteries offer proven reliability at lower initial cost.
Examples of Lead Acid Batteries: Deka Sealed Gel Batteries, Deka AGM Batteries, Deka Fahrenheit Batteries , , Stryten Absolyte AGP, Narada Batteries
Pros:
- Lower upfront purchase cost
- Proven technology with wide availability
- Compatible with existing charging systems
- Recyclable materials and established recycling network
Cons:
- 3-5 year lifespan with 500-1,000 cycles
- Limited to 50% depth of discharge
- Regular maintenance required (watering, cleaning)
- Heavy weight requires reinforced mounting
- Slow charging rates to prevent damage
- Voltage drops significantly during discharge
- Temperature sensitive performance
- Toxic gases during charging (ventilation required)
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