Texas-based solar manufacturer Sol-Ark has introduced its new Limitless 12K-2P-LL Hybrid Inverter, a Texas-made transformerless DC system.
The new product features a 3 MPPT architecture supporting two strings per MPPT, allowing it to maximize power production on complex, real-world roofs. The inverter handles a maximum allowed/usable PV input power of 19,200 W, supporting large solar arrays and offering compatibility with modern, high-wattage modules.
Sol-Ark said the unit delivers a continuous AC output power of 12 kW when connected to the grid or load, alongside an off-grid peak surge capacity of 24 kW for up to 10 seconds. For standalone battery applications, the system maintains a maximum continuous AC output power of 10 kW.
The system integrates a 100 A continuous AC passthrough feature, which the company said allows installers to connect the unit directly to larger backup load panels without requiring external contactors. Additionally, the inverter features a dedicated “GEN” port that supports up to 14 kW of external AC power. This port can accommodate input from standby generators, microinverters, or alternative AC-coupled sources without requiring an external transfer switch.
Operating as a 48 V low-voltage system, the inverter’s battery input architecture supports both lead-acid and lithium-ion technologies. It features a battery capacity range of 50 Ah to 9,900 Ah and a maximum charge/discharge current of 220 A. Sol-Ark noted that the system achieves a grid-to-battery charging efficiency of 96% and an overall maximum efficiency of 97.6%. For expanding storage or power requirements, up to 12 of the units can be stacked in parallel.
The 12K-2P-LL is housed in an IP65/NEMA 3R-rated enclosure measuring 654 mm x 452 mm x 254 mm (25.7 in x 17.8 in x 10.0 in) and weighing 29.5 kg (65 lbs). It includes intelligent air cooling and operates in ambient temperatures ranging from -40°C to 60°C, with derating applied above 45°C.
On the safety front, the system features integrated PV DC disconnects, ground fault detection, rapid shutdown control, and arc fault detection (AFCI). It also includes both AC and DC Type II surge protection.
The inverter complies with major North American standards, including UL1741 3rd SB, UL1741 CRD-PCS, IEEE1547-2018, and Hawaiian Electric SRD V2.0, enabling interoperability via IEEE2030.5. Sol-Ark backs the Texas-made hybrid inverter with a standard 10-year warranty.
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