Sofar Solar Tri 5 kW Hybrid Inverter – ESI 5K-T1

Sofar Solar ESI‑5K-T1 — The three-phase hybrid inverter that transforms your home

Unlock your energy

The Sofar Solar ESI-5K-T1 is a 5kVA three-phase hybrid inverter, ideal for homes and small businesses. It combines solar power generation, battery storage and virtually instantaneous backup power. It is a robust, quiet and connected solution that brings you comfort, savings and peace of mind.

Why you’ll love it

Flexible and smart storage

• Compatible with Sofar BTS 5K batteries
• Customisable runtime to suit your needs
• Expandable capacity from 5.12 kWh to 30.72 kWh (1 to 6 modules in parallel)
• Smart charge and discharge management to extend battery life

You only pay for what you need today, and you can upgrade tomorrow.

Ultra-fast backup (<10 ms)

• Your essential devices remain powered without interruption
• Automatic switchover in the event of a mains power cut
• Your essential equipment (lights, fridge, internet router, computers) continues to operate without interruption

Say goodbye to annoying power cuts and interruptions.

Optimised solar output

• 3 independent MPPT controllers to maximise output even if your panels are installed on multiple roofs (different orientations, partial shading, etc.)
• Up to 10 kWp of panels

Every ray of sunshine is harnessed to minimise your bill.

Quiet & robust

• Passive cooling without a fan: no noise, no maintenance
• IP66 rating: total protection against dust and rain

Discreet, durable and reliable for years of peace of mind.

Connected & smart

• Real-time monitoring via the SolarMan app (iOS & Android)
• Built-in connections: Wi-Fi, LAN, RS485, CAN (4G option)
• Integrated EMS (Energy Management System): smart energy management between panels, the grid, batteries and domestic consumption

Everything is under control, even remotely.

Economy & ecology

• Maximum efficiency of 98%
• Significant reduction in grid dependency and energy bills
• A greener, future-focused home

You generate and consume your own energy, whilst contributing to the energy transition.

What this inverter actually does

The Sofar ESI 5K-T1 performs three functions continuously:

• It converts the energy from your solar panels (direct current) into electricity that can be used in your building (380/400/415 V three-phase AC), with a maximum efficiency of 98% — among the best in its class.
• It stores surplus energy in a Sofar BTS high-voltage battery for use in the evening, at night or during a power cut.
• It automatically switches to the battery in the event of a grid outage within 10 ms, with no noticeable interruption to your equipment.

With an installation of 8 to 10 solar panels (8 to 10 kWp) and a 10 kWh battery, you can achieve 65 to 80% self-consumption, representing an estimated saving of between €1,000 and €1,600 per year on your electricity bill, depending on your consumption profile.

Use our simulator to get a personalised estimate in 2 minutes.

3 independent MPPT trackers: maximum installation flexibility

This is one of the major advantages of this model compared to 2-MPPT inverters. With 3 fully independent MPPTs (range 160–950 V, max voltage 1,000 V):

You can connect panels on 3 different roof orientations (south, east, west) without any loss of output on the less sunny sides

In the event of partial shading on one side, the other two continue to produce at full capacity

Each MPPT accepts 1 string up to 25 A — up to 10,000 Wp of panels in total (approximately 20 to 25 panels of 400–500 Wp)

Ideal for large, complex roofs or multi-orientation ground-mounted installations

Practical applications with the Sofar ESI-5K-T1

Residential use (main house)

• Solar self-consumption to reduce electricity bills
• Back-up power supply to prevent power cuts

Comfort guaranteed every day.

Commercial use (small business / office)

• Uninterrupted power supply for computers, servers and cash registers

Protection against data loss and business interruptions.

Agricultural use

• Pumps, greenhouse lighting and ventilation systems always operational

A reliable tool that safeguards agricultural production.

Mobility applications

• Charge an electric vehicle using your own solar-generated electricity

You drive cleanly, using free, renewable energy.

Secondary use (holiday home)

• Remote management and batteries ready when needed

Peace of mind and security, even when you’re away.

Why three-phase power makes all the difference

The three-phase grid (380/400/415 V) is found in most modern homes, as well as in all commercial and agricultural buildings. Compared to a single-phase inverter, the ESI 5K-T1 offers tangible benefits:

• Automatic load balancing across the 3 phases: each phase of your system consumes and generates power in a balanced manner, reducing losses and optimising the use of your solar energy
• Compatible with large three-phase equipment: agricultural pumps, industrial motors, compressors, commercial air conditioning units
• Balanced grid injection: a legal requirement in many countries for three-phase installations
• High starting power: 5,500 VA peak, ideal for equipment with high inrush current (motors, compressors)

High-voltage battery: a modern and scalable architecture

The Sofar ESI 5K-T1 is compatible with the Sofar BTS 5K high-voltage battery system (350–435 V LiFePO4):

• Total modularity: start with 1 BTS 5K module (5.12 kWh) and add up to 6 modules to reach 30.72 kWh of storage — without changing the inverter
• CATL LiFePO4 cells: among the safest and most durable battery technologies on the market
• BMS integrated into each module: intelligent charge and discharge management to maximise cell lifespan
• Max. charge current: 25 A / max. discharge current: 15 A — designed for residential and semi-commercial use

Who is this inverter for?

Homes with a three-phase meter (newer homes, large floor area). Solar self-consumption with storage, emergency power supply in the event of a power cut, charging of electric vehicles using your own solar energy.

Small businesses and offices. Uninterrupted power supply for computers, servers, cash registers — protection against data loss and business interruptions.

Farms. Irrigationpumps , greenhouse lighting, ventilation, refrigeration systems — equipment that remains powered even during grid outages.

Tradespeople and workshops. Machine tools , compressors, three-phase equipment partially powered by solar energy to reduce business costs.

SolarMan Smart

SofarSolar is redefining the future of energy with smart inverters. Equipped with advanced monitoring features, our inverters come with a WiFi Stick as standard, paving the way for seamless connectivity. Choose your path to efficiency with options such as Ethernet, GPRS or LTE dongles. Transform every installation into a digital symphony, where solar power becomes a connected, smart and sustainable experience. SofarSolar, your partner for smarter, brighter energy.

Apple Store - Solarman Smart

Android - Google Play - Solarman Smart

Setup steps:

1. After launching the app, register as a new user or enter your current SOLARMAN login details.
2. Create a new system and save the system data.
3. Scan the barcode on the logger stick to assign an inverter to the system.
4. Go to the newly created system to configure the logger stick (device/logger).
5. Press the button on the WiFi dongle for 1 second to activate the dongle’s WPS mode so that the smartphone can connect to the WiFi dongle.
6. Now select your local WiFi network for internet access and enter your WiFi password.
7. The WiFi dongle is now configured with the access details.

FAQ — Sofar ESI-5K-T1 model

What panel capacity should be installed with the ESI-5K-T1?
Up to 10 kWp of solar panels can be connected to maximise output.

Can I start without batteries?
Yes, the inverter operates without batteries in direct self-consumption mode. You can add storage later.

What battery capacity is recommended?

• 5 kWh: low-energy home or basic backup
• 10 to 15 kWh: full family home
• 20+ kWh: high consumption or small businesses

And in the event of a grid failure?
The inverter switches over in less than 10 ms: your appliances continue to run without interruption.

Is it quiet?
Yes. With no fan, cooling is entirely passive: very quiet.

What is the lifespan?
The UPS is designed to last over 10 years, with a manufacturer’s warranty (10-year warranty, extendable subject to conditions).

The future of energy in your home

The Sofar Solar ESI-5K-T1 is more than just an inverter: it is the heart of your energy self-sufficiency. With its 5 kW output, scalable storage and responsiveness, it ensures your home is always powered, more economical and more environmentally friendly.