PRE-ORDER SALE - Estimated November 2026 Arrival
DOWNLOADS:
- Datasheet
- Certifications are pending and estimated for Nov 2026
The Fox ESS H3 Plus 208/220/240V Three-Phase Hybrid Inverter is a high-performance energy solution engineered for commercial and large-scale residential solar installations. Designed with advanced hybrid technology, it seamlessly integrates solar generation, battery storage, and grid interaction to maximize energy efficiency and system reliability.
With power ratings ranging from 37.5kW to 70kW, this inverter is ideal for demanding applications requiring stable, scalable, and intelligent energy management. Its ability to support 100% unbalanced three-phase output makes it particularly suitable for commercial loads with varying phase demands.
The H3 Plus features EPS (Emergency Power Supply) functionality with ultra-fast switching (<10ms), ensuring critical systems remain powered during grid outages. When paired with compatible high-voltage LiFePO4 batteries (not included), it enables long-duration backup power, exceeding 6 hours depending on system configuration.
Equipped with FoxCloud V2.0 monitoring, users gain full visibility and control over system performance through WiFi, LAN, Bluetooth, or optional 4G connectivity. Installers benefit from flexible communication ports and advanced diagnostics, simplifying commissioning and maintenance.
Built for durability, the inverter features NEMA 4X protection, smart air cooling, and robust safety mechanisms including surge protection, AFCI, and ground fault detection, making it suitable for both indoor and outdoor installations.
KEY FEATURES:
- High-Power Commercial Hybrid Inverter
Available in 37.5kW, 50kW, 60kW, and 70kW models, designed for large residential, commercial, and industrial solar systems with high efficiency and scalable energy management. - Battery-Ready (No Battery Included)
Supports high-voltage LiFePO4 battery systems (180-700V) for energy storage and backup power. Battery not included, compatible with multiple HV battery solutions. - Grid-Tied + Off-Grid Backup (EPS)
Seamlessly operates in grid-tied or off-grid mode with <10ms switching time, ensuring uninterrupted power during outages. - Smart Monitoring with FoxCloud
Built-in WiFi, LAN, Bluetooth, and optional 4G enable real-time monitoring, remote diagnostics, and system optimization via mobile app. - Advanced Three-Phase Output
Supports 100% unbalanced three-phase loads, delivering stable and reliable power for complex commercial applications.
TECHNICAL SPECIFICATIONS
| Specification | Details |
| Models Available | H3-37.5-Plus-US-L (37.5kW) |
| H3-50-Plus-US-L (50kW) | |
| H3-60-Plus-US-L (60kW) | |
| H3-70-Plus-US-L (70kW) | |
| Max PV Power | 75kW-140kW |
| MPPT Voltage Range | 180-700V |
| Max Input Voltage | 850V |
| MPPT Trackers | 4 / 8 (model dependent) |
| Battery Type | LiFePO4 (High Voltage) |
| Voltage Range | 180-700V |
| Max Charge/Discharge Current | 240A |
| Battery Communication | CAN |
| Nominal Voltage | 208V / 220V / 240V |
| Frequency | 50/60Hz |
| Power Factor | 0.8 leading to 0.8 lagging |
| Max Efficiency | 97.7% |
| Switching Time | <10ms |
| Backup Duration | 6+ hours (depending on battery) |
| Dimensions | 730 × 1060 × 305 mm |
| Cooling | Smart Air Cooling |
| Noise Level | <70dB |
| Protection Rating | NEMA 4X |
| Operating Temp | -30°C to 60°C |
| Communication | WiFi, LAN, Bluetooth, RS485, USB |
| Optional 4G | |
| FoxCloud Monitoring App |
IMPORTANT NOTES:
- ⚠️ Battery not included – inverter is battery-ready and requires a compatible HV battery system
- ⚠️ Professional installation recommended for three-phase systems
- ⚠️ Designed for commercial and large residential applications