18KW Hybrid Inverter
Runtech R12KLNA is an 18 kW, 48 V low‑voltage split‑phase hybrid energy storage inverter designed for the residential energy‑storage market. Compatible with 220 V and 380 V systems, it features a rated grid‑tied output of 12 kVA and a maximum PV DC input of 18 kW. It integrates four core functions: four‑channel independent MPPT PV charging, 48 V lithium‑ion / lead‑acid battery management, dual AC input for utility mains / generator, and dual‑mode inversion for grid‑tied and off‑grid backup operation.
I. Product System Overview
Runtech R12KLNA is an 18 kW, 48 V low‑voltage split‑phase hybrid energy storage inverter engineered for the residential energy‑storage market. Compatible with 220 V and 380 V systems, it delivers a rated grid‑tied output of 12 kVA and accepts a maximum PV DC input of 18 kW. It integrates four core functions: four independent MPPT PV charging channels, 48 V lithium‑ion / lead‑acid battery energy‑storage management, dual AC input for utility mains / generator, and dual‑mode inversion for grid‑tied and off‑grid backup operation.
The unit supports AC‑coupled retrofitting of existing PV systems and multi‑unit parallel connection for expanded 208 V three‑phase power supply, with a maximum bypass current of 200 A. Paired with 30‑60 kWh low‑voltage battery packs, it forms a complete residential PV‑storage system. Boasting IP65 outdoor protection and stable operation across a wide temperature range of ‑25 ℃ to 60 ℃, the product series has obtained authoritative North‑American certifications including UL, FCC and IEEE. It serves as the core all‑in‑one PV‑storage device for North‑American villas, small stores and off‑grid campsites.
II. Eight Core Product Advantages
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Split‑phase Architecture for 100 % Unbalanced‑load CompatibilityFeaturing native 120/240 V split‑phase output perfectly matching household circuits, it independently powers 220 V small‑size home appliances as well as 240 V high‑power air‑conditioners, electric water heaters and EV chargers. It tolerates 100 % unbalanced two‑phase loads without voltage drop or waveform distortion on heavily‑loaded single branches. Multi‑unit parallel operation enables extended 380 V three‑phase power supply to meet high‑power commercial‑load requirements.
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Four Independent MPPT Channels with 18 kW Massive PV Input CapacityEquipped with four independent MPPT controllers achieving up to 99.9 % MPPT tracking efficiency. The maximum single‑unit PV DC input reaches 18 kW with 16 A maximum input current per channel. It adapts to multi‑orientation and partially‑shaded rooftop PV layouts to maximize on‑site PV self‑consumption. The wide MPPT voltage range of 120‑500 V permits stable PV power generation even without battery connection.
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250/260 A High‑current Battery Charge‑discharge, Broad Battery CompatibilityBuilt on the 48 V low‑voltage battery platform, it supports 250 A maximum charging current and 260 A maximum discharging current. Paired with 30‑60 kWh battery packs, it realizes rapid storage and release of PV energy. Compatible with both lithium‑ion and lead‑acid batteries, it adopts built‑in three‑stage equalization charging algorithms and natively supports BMS communication for lithium‑ion batteries, delivering wider battery adaptability and extended service life.
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Dual AC Input for Multi‑energy Coordination among PV, Utility Mains and Diesel GeneratorsDedicated dual AC input ports for utility mains and diesel generators enable energy storage via off‑peak grid power as well as power from diesel generators. AC‑coupled retrofitting of existing grid‑tied PV systems is supported; energy‑storage functions can be upgraded without replacing original PV modules, bringing high cost‑effectiveness for PV retrofits on existing buildings.
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200 A High‑current Bypass for Whole‑house Uninterrupted Backup PowerA built‑in 200 A high‑current bypass loop allows all household appliances to connect to the backup circuit. Millisecond‑level switch‑over to off‑grid backup mode occurs upon grid failure. It continuously outputs 12 kVA without PV input and reaches a peak of 13.2 kVA with PV assistance. Short‑term overload capacity of 110‑150 % supports uninterrupted operation for air‑conditioners, water pumps and medical equipment.
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Comprehensive Multi‑layer Safety Protection & Complete North‑American Authoritative CertificationsIntegrated protection functions include ground‑fault detection, arc‑fault protection, anti‑islanding protection, insulation monitoring, residual‑current monitoring, and full‑circuit over‑current / over‑voltage / short‑circuit protection. The unit holds full North‑American grid‑interconnection safety certifications: UL1741, UL1699B, FCC Class B, IEEE1547, and complies with California Rule 21 and NEC690 industry standards. IP65 outdoor dust‑proof and water‑proof performance guarantees stable operation in rain and snow conditions.
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Industry‑leading Conversion Efficiency to Cut Long‑term Electricity CostsMPPT tracking efficiency: 99.9 %; maximum PV‑to‑grid efficiency: 96.5 %; PV‑to‑battery charging efficiency: 95.8 %; battery‑to‑load efficiency: 94.6 %. Standby power consumption is lower than 25 W for minimal annual energy loss. Combined with time‑of‑use tariff strategies for off‑peak charging and on‑peak discharging, it effectively reduces monthly electricity expenses.
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Intuitive Touch‑screen HMI & Multi‑channel Remote Monitoring and O&MA high‑definition touch‑screen display enables one‑click local parameter configuration. Standard RS485 and CAN communication interfaces are provided, with optional Wi‑Fi / 4G IoT modules. The mobile APP remotely monitors power generation, battery SOC and load data, and supports remote firmware upgrade. Intelligent temperature‑controlled fan cooling keeps operating noise as low as 38 dB for noise‑free outdoor installation.
III. Four Typical Application Scenarios (Operated with 30‑60 kWh Low‑voltage Battery Packs)
Scenario 1: PV‑storage for Detached Houses / Private Dwellings (Primary Application)
Compatible with standard 220 V / 380 V household circuits when matched with 20‑80 kWh battery packs. PV power is consumed on‑site during daytime; surplus energy is stored in batteries for off‑grid power supply at night. Time‑of‑use arbitrage lowers power costs for air‑conditioners, heat pumps and home EV chargers. Automatic switch‑over to backup power during hurricanes or blackouts ensures continuous operation of refrigerators, lighting, security and medical equipment for household energy independence.
Scenario 2: Energy Storage for Small Retail Stores, Farms and Light‑duty Commercial‑industrial Sites
Suitable for convenience stores, agricultural farms and small workshops paired with 40‑60 kWh high‑capacity battery packs. It offsets peak‑hour high power draw of water pumps, refrigeration units and power tools to cut demand‑charge costs. It serves as an uninterruptible power source for regions with unstable grids to prevent production losses caused by power outages. Generator linkage is available to supplement energy storage on cloudy and rainy days for stable round‑the‑clock production power supply.
Scenario 3: AC‑coupled Retrofit for Existing PV Systems
For residences and stores with legacy grid‑tied PV installations, energy‑storage functions can be added by deploying this inverter together with battery packs, without dismantling existing PV modules. This low‑cost upgrade enables surplus‑energy storage and blackout backup power, solving the pain point that conventional PV systems stop working once grid power fails.
Scenario 4: Off‑grid Remote Campsites, Islands and Field Micro‑grids
For off‑grid locations including suburban cabins, farms, border posts and field base stations with no public utility access. PV modules plus 30‑60 kWh battery packs and diesel generators form standalone micro‑grids to reliably supply lighting, irrigation equipment and monitoring systems. Multi‑unit parallel expansion builds higher‑power off‑grid energy‑storage systems to address power‑supply challenges in remote areas.
