The Sofar Solar ESI-9.9K-T1 hybrid inverter is a 9,900 W three-phase solution designed for large homes, businesses and farms looking to generate, store and secure their electricity supply using solar power. Synergrid-certified, it is fully compliant with Belgian grid requirements.
Maximised solar output across 3 orientations
Its **3 independent MPPT trackers** can accommodate up to **20 kWp of panels** — equivalent to around 45 to 50 standard panels — and adapt to all roof configurations, even complex ones.
Modular storage from 5 to 30.72 kWh
Compatible with **Sofar BTS 5K** lithium batteries (high-voltage LiFePO4), expandable from 1 to 6 modules. Start without a battery and add storage as your needs evolve.
Backup power in under 10 ms
Virtually instantaneous switchover to battery power in the event of a grid outage. Your critical equipment remains powered without any noticeable interruption.
Silent, robust, connected
Fully passive cooling (zero fans), **IP66** protection, maximum efficiency of **98.2%** and monitoring via **SolarMan Smart** (built-in Wi-Fi, LAN, RS485, optional 4G).
The Sofar Solar ESI-9.9K-T1 is a 9.9kVa three-phase hybrid inverter, ideal for homes and small businesses. It combines photovoltaic production, battery storage and near-instantaneous back-up power. It's a robust, silent, connected solution that brings you comfort, savings and peace of mind.
Modular, intelligent storage
You only pay for what you need today, and you can upgrade tomorrow.
Ultra-fast back-up (<10 ms)
Say goodbye to annoying power cuts and interruptions.
Optimised solar production
Every ray of sunlight is used to reduce your bill as much as possible.
Silent & robust
Discreet, durable and reliable for years of peace of mind.
Connected & intelligent
Everything under control, even remotely.
Economy & ecology
You produce and consume your own energy, while contributing to the energy transition.
Residential use (main house)
Daily comfort guaranteed.
Professional use (small business / office)
Protection against data loss and business interruptions.
Agricultural use
A reliable tool that secures agricultural production.
Mobility use
You drive cleanly, using free, renewable energy.
Secondary use (holiday home)
Peace of mind and security, even when you're away.
SofarSolar is redefining the future of energy with intelligent inverters. Equipped with advanced monitoring features, our inverters include WiFi Stick as standard, paving the way for seamless connectivity. Choose your path to efficiency with options such as Ethernet keys, GPRS or LTE. Turn every installation into a digital symphony, where solar power becomes a connected, intelligent and sustainable experience. SofarSolar, your partner for smarter, brighter energy.
Android - Google Play - Solarman Smart
Configuration steps:
1. After starting the application, register as a new user or enter your current SOLARMAN access data.
2. Create a new system and save the system data.
3. Scan the barcode on the stick logger to assign an inverter to the system.
4. Access the newly created system to configure the stick logger (device/logger).
5. Press the WiFi stick button for 1 second to activate the stick's WPS mode so that the smartphone can be connected to the WiFi stick.
6. Now select your local WiFi network for Internet access and enter your WiFi password.
7. The WiFi key is configured with the access data.
How many panels should I install with the ESI-9.9K-T1?
Up to 20 kWp of solar panels can be connected to maximise production.
Can I start without batteries?
Yes, the inverter works without batteries in direct self-consumption mode. You can add storage later.
What battery capacity is recommended?
What happens in the event of a mains failure?
The UPS switches over in less than 10 ms: your equipment continues to run without interruption.
Is it silent?
Yes, as there is no fan, the cooling is totally passive: very quiet.
How long does it last?
The UPS is designed to last more than 10 years, with a manufacturer's guarantee (10-year guarantee, extendable under certain conditions).
The Sofar Solar ESI-9.9K-T1 is more than just an inverter: it's the heart of your energy autonomy. With its 9.9 kW output, scalable storage and responsiveness, it ensures that your home is always supplied with energy, more economically and more ecologically.
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Sofar Solar Tri 9.9 kW Hybrid Inverter – ESI-9.9K-T1 by Sofar Solar is available in our Hybrid inverters catalog. Technical specifications: inverter power in va: 9900 VA, operating temperature: -30°C to +60°C (derating above +45°C), voltage: 48V, phase: Triphasé, number of mppt: 3 MPPT, ip protection: IP 66, inverter type: Hybrid, max. recommended pv input power: 20000 Wc, starting voltage: 200V, nominal mains voltage: 3(N)~+PE, 380/400/415 Va.c., type of cooling: Natural convection - No fan, thdi (nominal power) : inférieur à 3 %, maximum discharge current: 29,7 A, weight: 30 kg, dimensions (l x w x d) : 708 x 440 x 170 mm, maximum input voltage: 1000 V, communication: Wi-Fi, LAN, RS485, CAN, optional 4G, european weighted efficiency: 97,5 %, nominal input voltage: 600 V, maximum efficiency: 98,2 %, nominal battery voltage: 350 - 435 V, rated ac power: 9900 W, nominal apparent ac power: 9900 VA, ac apparent power max.: 9900 VA, switching time: +10 ms, nominal frequency: 50/60Hz, mppt voltage range: 160 - 950 V, pv input current: 25 / 25 / 25 A, number of mppt / strings per mppt: 1 / 1 / 1, adjustable power factor range: 0.8 ahead ... 0.8 behind. Product weight: 30.0 kg. Reference: ESI-9.9K-T1.
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