Knox Argon 4200 4.2kW 24V Dual Output Hybrid Solar Inverter

Product Overview

The Knox Argon 4200 (Model: 4.2kW-24-pV5000-Twin) is a single-phase hybrid off-grid inverter engineered for mid-to-large residential setups and commercial offices facing erratic utility grids. Running on a cost-effective 24VDC battery architecture, this unit supplies a full 4200W continuous pure sine wave AC output. It introduces dual AC load output terminals designed for automated smart load management, resolving the common off-grid failure point where heavy non-critical appliances deplete the battery bank during extended blackouts. Operating on a 230VAC nominal grid standard, the unit features an ultra-wide AC input range of 90VAC to 280VAC in home appliance mode. This prevents premature transfers to battery inversion when grid voltages collapse during neighborhood brownouts. For installations where battery investment is phased, the Argon 4200 operates in battery-less mode, directing up to 5000W of daytime solar PV energy straight to connected appliances while using grid bypass strictly as balance support. ## Key Engineering Advantages - Dual AC Load Terminals (Twin Output): Splits loads into main (critical) and secondary (non-critical) circuits. When the battery drains to a defined threshold, the inverter automatically disconnects the secondary port (water heaters, secondary air coolers), reserving remaining battery capacity exclusively for essential lights, routers, and refrigerators. - High-Current 27A MPPT Controller (30V–500V): Equipped with a 500VDC open-circuit ceiling and an industry-leading 27A solar input current. This allows direct pairing with modern high-power bifacial solar modules over 550W–650W without clipping string current. - Native RS485 BMS Closed-Loop Communication: Unlike standard off-grid inverters that rely on crude voltage approximations, the Argon 4200 communicates directly with LiFePO4 lithium battery management systems via RS485, guaranteeing accurate state-of-charge calculation and thermal cutoff. - Dual-Source Lithium Activation & Battery EQ: Features lithium battery wake-up pulses triggered by either PV solar or AC utility power to revive sleeping BMS protection circuits, alongside an integrated Equalization (EQ) algorithm that balances flooded and lead-carbon cells to prevent plate sulfation. - Anti-Shock Terminals & Detachable Dust Filters: Built with recessed, touch-safe electrical terminals to protect installers, complemented by washable, detachable side dust covers that prevent lint and debris ingress in harsh, non-conditioned environments. ## Compatibility & Application - Battery System Support: 24VDC battery systems (Flooded Lead-Acid, Tubular, AGM, Gel, and LiFePO4). Features RS485 communication protocols for lithium packs and customizable CC/CV charge profiles (27VDC float / 33VDC overcharge protection). - Operating Priority Modes: Fully configurable for UTL (Utility first), SOL (Solar first), SBU (Solar-Battery-Utility), and SUB (Solar-Utility-Battery) to optimize self-consumption and reduce electricity bills. - Critical Load Profiles: Delivers pure sine wave power (220/230VAC ±5%) with 8400VA surge capacity to run 1.5 HP pumps, 1-ton inverter air conditioners, domestic refrigerators, computers (10ms transfer), and sensitive medical monitors. ## Package Contents - 1x Knox Argon 4200 Hybrid Inverter (4.2kW-24-pV5000-Twin) - 1x User Manual & Installation Guide - 1x RS485 / RS232 Communication Cable - 2x Detachable Side Dust Filter Covers - 1x Wall Mounting Bracket & Fastener Kit

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