Sofar Solar Tri 9.9 kW Hybrid Inverter – ESI-9.9K-T1

Sofar Solar ESI-9.9K-T1 — The three-phase hybrid inverter that transforms your home

The Sofar Solar ESI-9.9K-T1: three-phase power for large installations and professionals

The Sofar Solar ESI-9.9K-T1 is the 9,900 W three-phase hybrid inverter in the ESI range — the most powerful model in the series. It is designed for large homes of 150 m² and above, farmers, tradespeople and small businesses with a three-phase installation looking to maximise their solar self-consumption. A key advantage for the Belgian market: it is Synergrid-certified, ensuring immediate compliance with the requirements of distribution network operators. Its maximum efficiency reaches 98.2% — the highest in the ESI range — with the capacity to handle up to 20 kWp of panels.

What this inverter actually does

• It converts the energy from your solar panels into three-phase 380/400/415V AC electricity with a maximum efficiency of 98.2% and 3 independent MPPT trackers to optimise each string separately
• It stores surplus energy in Sofar BTS 5K lithium batteries (high-voltage LiFePO4, 350–435 V) for use in the evening, at night or in the event of a grid outage
• It secures your power supply with a switchover to backup power in under 10 ms — imperceptible to your electronic devices, machinery and professional equipment
• It monitors your installation in real time via the SolarMan Smart app (iOS / Android), with built-in Wi-Fi at no extra cost
• It feeds surplus energy back into the grid if your contract allows

With 25 to 45 solar panels (10 to 20 kWp) and a Sofar BTS battery storage system of 10 to 20 kWh, a large house or small business can achieve 65 to 80% self-consumption, representing an estimated saving of between €1,200 and €2,500 per year depending on consumption patterns.

20 kWp capacity: the solution for large roofs and businesses

With a recommended PV input capacity of 20 kWp, the ESI-9.9K-T1 is designed for large rooftops on houses, agricultural sheds or commercial buildings. Its 3 independent MPPT trackers (range 160–950 V, 25 A per MPPT) allow panels to be distributed across multiple orientations or roof sections without any loss of performance — each string is optimised separately, even if one of them is partially shaded.

Synergrid-approved: guaranteed compliance with the Belgian grid

The ESI-9.9K-T1 is Synergrid-approved, meaning it meets the technical standards set by distribution network operators in Belgium. This certification simplifies the connection process and avoids delays associated with exemption requests. A decisive advantage for installers and customers seeking rapid commissioning.

Passive cooling: zero noise, zero maintenance

The ESI-9.9K-T1 relies exclusively on natural convection to dissipate heat — no mechanical fans. Three key benefits:

• Silent operation: no fan noise, even at full load — ideal for installation in a plant room, machinery room or near offices
• Increased reliability: the absence of moving mechanical parts eliminates the main source of failure in inverters
• IP66 protection: suitable for outdoor installation, in agricultural sheds or unheated rooms

Scalable storage: from 5 to 30.72 kWh

The ESI-9.9K-T1 is exclusively compatible with Sofar BTS 5K lithium batteries (LiFePO4, 5.12 kWh per module, 400 V high voltage). Between 1 and 6 modules can be connected in parallel, with a maximum discharge current of 29.7 A:

• 1 module (5.12 kWh): basic backup, small building
• 2–3 modules (10–15 kWh): large house or moderate commercial consumption
• 4–6 modules (20–30 kWh): high consumption, agricultural or light industrial use

⚠️ Important: the inverter operates without a battery in direct self-consumption mode. In the event of a grid outage without a battery connected, it shuts down (standard anti-islanding protection). Storage can be added after installation.

Monitoring: SolarMan Smart

Wi-Fi is built into the inverter — no additional dongle is required for basic monitoring. The SolarMan Smart app (iOS / Android) allows you to:

• View real-time production, consumption and battery status
• Check your daily, monthly and annual savings
• Diagnose faults remotely
• Manage multiple installations from a single account — ideal for installers and fleet managers

Additional connectivity options: LAN (wired), RS485 / CAN (battery and meter communication), optional 4G for sites without Wi-Fi (hangars, remote farms).

Installation

Installation must be carried out by a qualified electrician. Key points:

• Weight: 30 kg — two people are required for wall mounting
• Dimensions: 708 × 440 × 170 mm
• IP66 protection — suitable for outdoor installation, in a shed or unheated technical room
• Passive cooling, silent operation
• PV start-up voltage: 200 V — power generation possible from the first hours of daylight
• Operates without a battery from the moment of installation
• Synergrid-approved — guaranteed compliance with the Belgian grid without any additional steps

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 and 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 enter 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.

The future of energy in your home

The Sofar Solar ESI-9.9K-T1 is more than just an inverter: it is the heart of your energy self-sufficiency. With its 9.9 kW output, scalable storage and responsiveness, it ensures your home is always powered, more economical and more environmentally friendly.