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

Overview

Bringing the charge controller, battery inverter, grid-tie inverter, and transfer equipment into one transformerless 48V unit, the Sol-Ark Limitless 12K-2P-LL covers whole-home backup, grid sellback, and off-grid power. It delivers 12,000W continuous with a 24,000W ten-second surge off-grid, and a 5ms transfer.

Planning a system? Read our guide: How to size a battery backup system for your home.

Key benefits

• NEMA 3R / IP65 enclosure allows indoor or outdoor mounting.
• Works with both lead-acid and lithium banks, with closed-loop CANBus or RS485 for lithium.
• Integrated two-wire auto start for generators under 14kW on the GEN terminal.
• Limiter and time-of-use settings help match your interconnection rules and rate plan.

Key features

• Three MPPTs with two strings each, for 19,200W of usable PV
• Each MPPT handles 6.4kW and 500 VOC maximum, tracking 150 to 425V with a 125V startup
• 48V nominal, 43V to 59V, with up to 220A charge and discharge
• 100A GRID terminal pass-through and 60A GEN terminal
• GEN terminal can also serve as a Smart Load output or AC coupling input up to 14,000W
• Weighs 65 lb

Ideal use

A strong fit for whole-home backup and off-grid homes on 48V battery banks, including sites with a backup generator.

What is included

• Temperature sensor
• Pair of 200A CT sensors

Key specifications

Model / SKU

12K-2P-LL

Brand

Sol-Ark

Category

Whole-home backup

Voltage

48V

From the manufacturer

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

Warranty terms mentioned in this description are the manufacturer’s. Our own coverage is the 30-day limited warranty.

Before you order

We confirm compatibility, installation requirements, and delivery details with you during order review, before any payment. Home electrical work may require a qualified installer.

Our team can help you size PV strings and choose a compatible 48V battery for the Limitless 12K-2P-LL. Message our team on WhatsApp.