The HERF-800 is a micro-inverter from Estar Energy (brand HERF), designed to connect individual solar panels to the grid (grid-tie system). It converts the direct current (DC) from solar panels to alternating current (AC) that can be fed directly into your home or electricity grid. It is suitable for outdoor installations, for small to medium-sized solar power systems, such as balcony power systems, garage roofs, and small PV arrays.
Technical specifications
Below are the key technical data of the HERF-800, as gathered from various sources:
| Feature | Value / explanation |
|---|---|
| Recommended panel power (DC) | About 300-540+ W per panel |
| MPPT voltage range (DC) | 16-48 V (working MPPT range) |
| Starting voltage (minimum DC voltage to start) | 22 V |
| Maximum DC input voltage | 60 V |
| Maximum DC input current per input | 2 × 13.5 A (there are 2 DC inputs) |
| Nominal AC output power | 800 VA (i.e. 800 W AC) total |
| AC output current | Approx. 3.48 A at 230 V AC |
| AC voltage / range | Nominal 230V; allowable range ~180-270V |
| Frequency | 50 Hz (with possible range ±- slightly dependent on grid requirements) |
| Efficiency | Peak efficiency (CEC) approximately 96.5% |
| Standby / night consumption | < 50 mW (very low consumption) |
| Protection class / IP value | IP67 (dust and waterproof, resistant to outdoor use) |
| Temperature range | -40 °C to +65 °C |
| Dimensions & weight | Approx. 260 × 197.5 × 35.6 mm ; weight approx. 3.9 kg |
Features & Additional Properties
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2 DC inputs: you can connect 2 solar panels to the inverter.
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MPPT (Maximum Power Point Tracking) at module level, enabling optimal yield even under varying light conditions.
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Fast start function — the inverter can start within ~12 seconds under good conditions.
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Safety features such as earth fault monitoring, grid monitoring, residual current monitoring.
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Certification according to VDE-AR-N 4105 (German standard for connection to the public electricity grid)
Plus points
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High power in a compact unit : 800W AC from a single micro-inverter is significant, meaning you need fewer units for a given wattage.
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Rugged construction / outdoor use : IP67 housing + wide temperature range makes it suitable for harsh conditions (sun, rain, heat, cold).
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Low starting voltage & wide operating voltage : ensures operation at lower panel voltages or light cloud cover, increasing yield.
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Low standby consumption : minimizes unnecessary loss at night.
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Safety & certification : The VDE-AR-N 4105 standard is a plus for legislation/regulations in Europe.
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