The HERF-500 is part of the HERF series of micro-inverters from Estar (Xiamen E-Star Energy), designed to convert DC (direct current) into AC (alternating current) per solar panel (or module), suitable for use in the electricity grid or for residential use. It falls into the "single unit" class of micro-inverters, along with the HERF-300 and HERF-400 variants.
The HERF-500 is designed for use in grid-connected PV installations where module-level optimization, flexibility and reliability are important.
Technical specifications and features
| Feature | Value / explanation |
|---|---|
| DC / input side | |
| Recommended module power (DC) | Approx. 370 to > 670 W (module power that works well within this model) |
| Start voltage (minimum DC voltage) | 22 V |
| DC Voltage Range Operation | 16 to 60 V |
| Maximum input voltage | 60 V |
| Maximum DC current | 14.5 A |
| Number of MPPT / inputs | 1 MPPT, 1 input |
| AC / output side | |
| Nominal power (AC) | 0.5 kW (500 W) |
| AC voltage / range | Nominal 230 V, with range of ± 180-270 V |
| Maximum AC current | 2.13 A |
| Frequency range | 45 – 55 Hz, nominal 50 Hz |
| Power factor (cos φ) | Adjustable, typically 0.8 (leading/low-speed to 0.8 rear) |
| Distortion (Total Harmonic Distortion, THD) | < 3% |
| Efficiency & consumption | |
| Maximum efficiency | 96.5% (peak level) |
| Night consumption / standby consumption | < 0.05 W |
| Mechanical & protection | |
| Temperature range | -40 °C to +65 °C |
| Protection class | IP67 (dust and waterproof to a certain degree) |
| Cooling | Natural convection (fanless) |
| Dimensions (WxHxD) | 165 × 197 × 31.1 mm |
| Weight | 2.35 kg |
| Communication / monitoring | Wireless 2.4 GHz connection for monitoring/system communication |
Key Features & Benefits
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Module-Level Optimization (MLPE) : Each panel is individually optimized — shading, mismatch, or panel performance have less impact on the system as a whole.
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Low starting voltage & wide operating range : thanks to the low starting voltage (22 V) and wide DC operating voltage, the inverter can already operate in less than optimal light conditions.
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High Efficiency : With peak efficiency of ~96.5%, it helps to maximize yield.
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Rugged design : IP67 housing and a temperature range of up to +65 °C make it suitable for outdoor use in challenging conditions.
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Low standby power consumption : < 0.05 W, which is beneficial to minimize energy loss at night.
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Communication & Monitoring : By integrating wireless communications, you can remotely monitor status, performance, and errors.
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Compatibility & Scalability : Suitable for PV panels within the specified DC range, easily integrated into residential or commercial systems.
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