Sol-Ark Limitless 12K-2P-LL Hybrid Inverter for Whole Home Backup, Grid Sellback, and Off-Grid Power, NEMA 3R

About the Sol-Ark Limitless 12K-2P-LL Hybrid Inverter

The Limitless 12K-2P-LL consolidates the solar charge controller, battery inverter, grid-tie inverter, and automatic transfer equipment into one transformerless 48V hybrid unit. It delivers 12,000W of continuous AC power and a 24,000W ten-second surge when off-grid, with a 5ms transfer time that keeps critical loads online through a utility outage. The enclosure is NEMA 3R / IP65 rated for outdoor or indoor mounting, and the unit weighs 65 lb.

Three Independent MPPTs and 19.2 kW of PV Input

Three MPPTs each accept up to two PV strings each, for 19,200W of usable array power. Each MPPT tops out at 6.4kW, handles a 500 VOC maximum, and self-limits to 32A even though the hardware tolerates a 60A short-circuit current. The rated MPPT tracking window is 150-425V, with a 125V startup. Strings sharing one MPPT must be designed to the same open-circuit voltage, since mismatched strings pull the pair down to the lowest string. Exceeding 500 VOC on any MPPT will damage the unit, so string sizing should account for open-circuit voltage at your minimum design temperature.

Battery Support and Charging

The 12K-2P-LL is a 48V nominal system that operates between 43V and 59V and accepts both lead-acid and lithium chemistries. Maximum charge and discharge current is 220A, and a 3-stage charge algorithm with equalization handles lead-acid banks while closed-loop CANBus or RS485 Modbus communication runs lithium banks from Sol-Ark's tested battery partner list. Battery capacity is configurable from 50 to 9,900 Ah. 

Compatible 48V banks we stock include the Pytes V16, Pytes V5, BigBattery NEXUS, Eneramp Endurance 5, and ECO-WORTHY PowerMega 314. An included temperature sensor performs voltage compensation for lead-acid banks; lithium batteries do not need it. 

Grid, Generator, and AC Coupling

The 100A GRID terminal supports up to 100A of passthrough, and the unit measures grid import and export at this terminal. The 60A GEN terminal (58A continuous) accepts a 120/240V split-phase generator under 14kW with integrated two-wire automatic start, or serves as a Smart Load output or an AC coupling input for micro and string inverters up to 14,000W. Larger generators connect to the GRID terminal instead, which accepts 220V single-phase, 120/240V split-phase, and 120/208V 3-phase (2 of 3 legs). 

Work Modes and Load Management

The Limiter menu lets you match production to your interconnection rules. Grid Sell exports all available solar, Limited Power to Home (Meter Zero) supplies the whole home without selling back for sites without an export permit, Limited Power to Load covers only the essential loads panel for off-grid setups, and the corresponding Grid Sell variants allow capped export. Time of Use adds six daily intervals for battery discharge, charging, or selling at programmable rates and SOC limits. The included pair of 200A CT sensors (Ø0.96") enable Meter Zero and grid peak shaving; larger 600A CTs are available to purchase for bigger service conductors.

Backup, Parallel Stacking, and Monitoring

A single unit covers 120/240V applications, and up to 12 units stack in parallel for larger split-phase or even 120/208V three-phase systems, sharing one common battery bank. Intelligent air cooling keeps the unit running across the full -40°C to 60°C range, with output derating above 45°C and above 3,000m (9,842ft) of elevation. The included Wi-Fi/Ethernet dongle connects to the MySolArk platform for remote monitoring and setting changes.

Protection and Certifications

Integrated protection covers PV DC disconnect (NEC 240.15), ground fault detection (NEC 690.5), rapid shutdown control (NEC 690.12), arc fault detection (NEC 690.11), PV input lightning protection, reverse polarity protection, and DC Type II / AC Type II surge protection. The unit's emergency-stop pins trigger rapid shutdown when closed, so pairing it with an initiator like the IMO Rapid Shutdown Initiator gives you a code-compliant manual shutdown for the array. The inverter is listed to UL 1741 3rd Edition SB, UL 1741 CRD-PCS, Hawaiian Electric SRD V2.0, UL 1699B PVDC AFCI, UL 1998, and CSA C22.2 No. 107. It ships with a 10-year standard warranty. 

What's in the Box

• Sol-Ark Limitless 12K inverter
• Wall mounting bracket with 4 stainless M4×12 screws and 4 stainless M8×80 anti-collision bolts
• 9 filter rings (EMI toroids)
• CAT5e communication cable
• 5mm T-type hex key for AC terminals
• Battery temperature sensor
• Wi-Fi/Ethernet antenna (dongle)
• Two 200A current transformers (CT sensors)
• LCD sunshade for outdoor installations