Tigo TSI-11.4K-US 11.4kW Single Phase Hybrid Solar Inverter/Charger

The Tigo Energy TSI-11.4K-US is an 11.4kW hybrid solar inverter built around the Tigo Energy Intelligence (EI) platform, combining a high-efficiency grid-tied inverter with battery energy storage orchestration, built-in module-level monitoring and rapid shutdown capability via Tigo TS4 MLPE, and an integrated revenue-grade meter — all in a fanless NEMA 4X/IP65 enclosure rated for outdoor installation. Compatible with 200A automatic transfer switches and certified to UL1741:2021 SA/SB and IEEE 1547:2018, it is designed for residential and light commercial solar-plus-storage systems where grid interconnection compliance, module-level optimization, and commissioning speed all matter.

Key Specifications

• AC Output: 11,400W @ 240V / 9,880W @ 208V; 48A max output current; >0.99 power factor; THDI <3%; L1/L2/N/PE grid connection; 50/60Hz
• PV Input: 4 MPPTs (2 strings each); 80–550V MPPT range; 600Vdc max; 13.5A/16.9A max IMP/ISC per MPPT; up to 200% DC oversizing (22,800W max PV power STC)
• Battery & Backup: 400V nominal DC; 11,700W I/O power (10,300W with EI Battery); 11,400W nominal backup / 13,600VA max with EI Battery @ 240V
• Efficiency & Cooling: 98.5% max; CEC 98.0% @240V / 97.5% @208V; natural convection (no fans); <1W PV / <5W storage night consumption
• Communications & Monitoring: Built-in Wi-Fi RS-485; optional 4G cellular dongle; NEC 690.12 rapid shutdown with TS4-A-F/2F or TS4-A-O/S; module-level monitoring with TS4-A-O/M/S; built-in ANSI C12.20 revenue-grade meter (±0.5% accuracy)
• General: 15.8 W × 7.4 D × 25.2 H in. (400 × 187 × 638 mm); 45.2 lbs. (20.5 kg); NEMA 4X/IP65
• Certifications & Listings: UL1741:2021 Ed.3 (SA)(SB), UL1699B (AFCI), IEEE 1547:2018, IEEE 2030.5 V2.1 gateway, FCC Part 15B; CA-CEC, CA Rule 21 CSIP, CA CPUC-SGIP, Hawaii Rule 14H/22/27/32, Puerto Rico OGPe; 152-month warranty

Four MPPTs with 200% DC oversizing

The TSI-11.4K-US features four independent MPPT inputs, each accepting two PV strings, giving installers the flexibility to connect arrays with different orientations, tilt angles, or shading profiles without one sub-array degrading another's output. Up to 200% DC oversizing — a 2:1 DC/AC ratio — allows array sizing of up to 22,800Wp against the 11.4kW inverter rating, letting designers optimize for real-world annual yield rather than peak output alone. The 80V starting voltage and 600Vdc maximum system voltage accommodate a wide range of module configurations and string lengths without requiring additional combiners or voltage clamps.

Tigo EI platform: inverter, storage, and MLPE in one system

The TSI-11.4K-US is the central controller of the Tigo Energy Intelligence ecosystem. When paired with a Tigo EI Battery, it orchestrates solar production, battery charging and dispatch, and grid interaction through a unified intelligence layer — optimizing self-consumption, managing backup power, and providing real-time system visibility through the EI mobile app and cloud platform. When Tigo TS4 MLPE (module-level power electronics) are installed on the array, the inverter enables per-module monitoring, production optimization, and NEC 690.12-compliant rapid shutdown through the same system — eliminating the need for a separate rapid shutdown device or monitoring gateway.

200A ATS and revenue-grade metering

The 601-2111K4-0003 variant is specifically rated for 200A automatic transfer switches, making it the correct choice for larger residential service panels where the standard 50A ATS-compatible models would be undersized. The built-in ANSI C12.20 revenue-grade meter meets ±0.5% accuracy requirements — sufficient for utility interconnection billing, net metering agreements, and SGIP incentive program reporting without adding an external meter. The IEEE 2030.5 V2.1 certified gateway interface supports CSIP (Common Smart Inverter Profile) for CA Rule 21 utility communication compliance.

Application scenarios

• Grid-tied residential solar-plus-storage: High-efficiency 11.4kW hybrid inverter with Tigo EI Battery for self-consumption optimization and whole-home backup.
• Multi-orientation rooftop arrays: Four independent MPPTs handle east/west splits, mixed tilt angles, or partially shaded sub-arrays without output penalties across unaffected strings.
• CA Rule 21 and Hawaii Rule 14H installations: Full grid support function certification and CSIP compliance satisfy utility interconnection requirements in the most restrictive markets without additional hardware.
• SGIP incentive applications: CA CPUC-SGIP listing and built-in revenue-grade metering satisfy program documentation requirements for California Self-Generation Incentive Program rebates.

Commissioning and monitoring

The TSI-11.4K-US commissions in under 10 minutes — including connected Tigo TS4 MLPE — through the EI mobile app, reducing installer time on site compared to systems requiring separate MLPE commissioning tools. Built-in Wi-Fi provides standard connectivity; an optional 4G cellular dongle kit (with 5-year prepaid plan, part 301-300000-0001) adds redundant cloud connectivity for sites with unreliable Wi-Fi. Fanless natural convection cooling eliminates the primary mechanical failure point in string inverters and reduces noise to zero during operation.

System compatibility

The TSI-11.4K-US operates with the Tigo EI Battery system at 400V nominal DC, with a maximum I/O power of 10,300W and backup output up to 13,600VA. It accepts RS-485 and Wi-Fi communication interfaces and integrates with the Tigo Energy Intelligence cloud platform for remote monitoring, firmware updates, and performance analytics. Module-level rapid shutdown requires Tigo TS4-A-F/2F or TS4-A-O/S devices; module-level monitoring and optimization require TS4-A-O/M/S devices. This unit is not available in Puerto Rico for the 3.8K model; the 11.4K model is listed under Puerto Rico OGPe.

Why choose the Tigo Energy TSI-11.4K-US?

The Tigo Energy TSI-11.4K-US is the right choice for installers and homeowners who want a single UL1741SB-certified hybrid solar inverter that integrates module-level monitoring, NEC 690.12 rapid shutdown, battery storage orchestration, revenue-grade metering, and 200A ATS compatibility — without adding separate devices for each function. At 98.5% max efficiency, 45 lbs., fanless operation, and a 152-month warranty, it delivers a premium feature set in a compact outdoor enclosure backed by one of the solar industry's longest standard warranties.