Knox Argon VM II 3500 – Off-Grid Inverter with Charger (Argon Series, Battery Independent)

The Knox Argon VM II 3500 is an advanced off-grid solar inverter that combines efficiency, durability, and user-friendly design. Part of Knox’s Argon series, this model is specially built for flexible energy management with or without a battery, making it ideal for modern off-grid solar systems. Engineered with a pure sine wave output, the inverter ensures stable power delivery, protecting sensitive appliances and electronics. Its wide PV input range allows compatibility with various solar panel configurations, while the maximum charging current of 100A provides efficient charging performance. The reserved communication port for BMS integration adds an extra layer of reliability and adaptability. Key Features & Benefits Pure sine wave output ensures stable and clean power suitable for sensitive electronics like computers, medical devices, and home appliances. Battery-independent design allows the system to operate even without a battery connected, giving installation freedom and reducing up-front cost. Wide PV input / MPPT range accommodates various solar panel strings and configurations, which gives flexibility in system design. High charging capability with up to 100 A charging current for fast and efficient energy storage when batteries are used. Built-in anti-dust kit helps protect internal modules in dusty or harsh environments, improving reliability and reducing maintenance. Reserved communication port (for BMS or external control) enhances monitoring and integration into larger energy systems. Battery equalization function helps maintain battery health by periodically balancing cell voltages, thereby extending battery lifecycle. Rugged operating range (–10 °C to 50 °C) means the inverter works reliably under varied environmental conditions. Technical Specifications of VM II 3500: Knox Argon VM II 3500 Specifications Model Rated Power 3000VA / 3000W Input Voltage 230 VAC Selectable Voltage Range 170-280 VAC (For Personal Computers); 90-280 VAC (For Home Appliances) Frequency Range 50 Hz / 60 Hz (Auto sensing) Output AC Voltage Regulation (Batt. Mode) 230 VAC ± 5% Surge Power 6000VA Efficiency (Peak) 93% Transfer Time 10 ms (For Personal Computers); 20 ms (For Home Appliances) Waveform Pure sine wave Battery Battery Voltage 24 VDC Floating Charge Voltage 27 VDC Overcharge Protection 32 VDC Solar Charger & AC Charger Solar Charger Type MPPT Maximum PV Array Open Circuit Voltage 450 VDC Maximum PV Array Power 3500W MPP Range @ Operating Voltage 60 ~ 400 VDC Maximum Solar Charge Current 100 A Maximum AC Charge Current 80 A Maximum Charge Current 100 A Physical Dimension (D x W x H) 110 x 288 x 390 mm Net Weight 7.2 kg Communication Interface RS232 / RS485, optional WiFi Environment Humidity 5% to 95% Relative Humidity (Non-condensing) Operating Temperature -10°C to 50°C Storage Temperature -15°C to 60°C Ideal Use Cases Remote homes or off-grid dwellings where grid power is unavailable or unreliable Microgrids or isolated cabins where power management flexibility is key Backup power systems that require both solar input and optional battery support Phased solar installations where battery storage might be added later Why Choose the Knox Argon VM II 3500? Knox’s Argon series is built for installers and end-users who demand reliability, ease-of-installation, and future-proof flexibility. The VM II 3500 stands out by letting you start with minimal components (even without a battery) and scale up as your needs grow, without replacing the core inverter. It’s a strong contender for any system seeking efficient, clean power from solar and robust integration for system expansion.