# Solar Microinverter, On-Grid, GMI-300W, 180-280VAC

- Page: https://sigmanortec.ro/en/solar-microinverter-on-grid-gmi-300w-180-280vac
- Price: 502.97 RON
- Availability: In stock; 1-2 zile
- Reference: 9983 · EAN: 5943099272802
- Category: Electronic components > Voltage Inverters
- Package (shipping data): 0.542 kg
- Updated: 2026-09-23
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 02:22 (Europe/Bucharest)

## Description

On-grid microinverter for integrating 18-50VDC photovoltaic panels and direct injection into the 180-280VAC grid, simply connects to the 220V socket and automatically synchronizes with the grid voltage and frequency. Integrated MPPT permanently optimizes the yield in variable light, high efficiency and silent operation through passive cooling. Complete protections and automatic shutdown in case of grid failure.
GMI-300W microinverter for integrating photovoltaic panels (18-50VDC) into an on-grid system. It allows direct injection into the electrical grid (180-280VAC) of the energy produced by solar panels, through perfect synchronization with the AC electrical grid.
It uses integrated MPPT technology, constantly optimizing panel performance to maximize daily yield, even in variable light conditions.
The connection is made directly to the 220VAC electrical outlet, and the inverter automatically detects the voltage and frequency of the network (ex: 230V/50Hz) and perfectly synchronizes its output signal with them. Once connected, the microinverter injects energy into the home network by pushing it to a voltage slightly higher than the local voltage of the home network, this prioritizing the consumption of the Microinverter and the solar panels connected to it.
It works exclusively connected to the electrical network and automatically turns off in its absence, providing complete protection against overvoltage, overcurrent, overheating and other unfavorable conditions. The housing has an IP55 protection factor (does not withstand direct rain) and the cooling system is passive (without a fan), which ensures silent operation.
Specifications:
Maximum output power: 300W
Rated output power: 280W
DC input voltage: 18V–50V
Maximum panel power: 300W at 30V
AC output voltage: 180V–280V (230V nominal)
Frequency: 50/60Hz (auto-detection)
Starting voltage: 24V
MPPT range: 24V–40V
Maximum efficiency: 92.5%
MPPT efficiency: 99.9%
Nighttime consumption: <700mW
Power factor: >0.99
Total Harmonic Distortion (THD): <5%
Operating temperature: -40°C to +65°C
Cooling system: Natural convection, no fans
Solar panel compatibility: Vmp 30–39V, Voc 38–46V
Grounding: Integrated via network cable
Protection degree: IP55
Dimensions: 35 x 76 x 233 mm
Weight: 0.5 kg
Use:
Mandatory installation in a ventilated location, away from humidity and direct radiation.
Grid connection: The microinverter is on-grid and requires an active grid to operate. In the absence of grid, it automatically shuts down.
Avoid exceeding the 50V (Voc) input value or the maximum allowed power.
Check the correct polarity when connecting the solar panels.
High temperature: If the internal temperature rises, the inverter automatically reduces the output power or stops until it cools down.
Recommendation: Do not use 12V panels with Vmp below 24V - they may lead to unstable operation or inverter failure.
Connecting multiple inverters:
Several inverters can be connected in parallel on the same network (respecting the socket capacity) to multiply the total power
LED signaling:
Solid green: the inverter is generating power.
Flashing red: standby mode.
Solid red: active protection (overvoltage, overheating, abnormal frequency, etc.).
Installation:
Fixing to the structure, next to the photovoltaic panel.
Connect the AC cable to the network (observe the color of the wires).
MC4 connection to the solar panel (pay attention to polarity).
Electrical connection to the distribution box.
Complete check of connections.
Turn on local AC fuse.
Mains activation – the inverter starts generating after ~3 seconds.