The Growatt MIC 1000TL-X (AF) is a 1kW single-phase, single-MPPT grid-tied string inverter with two factory-integrated safety features: an Arc Fault Circuit Interrupter (AFCI) and an integrated DC isolator switch. It is the AF-DC variant of Growatt’s compact MIC TL-X residential range, designed for small rooftop PV systems on UK domestic properties. The 50V start-up voltage enables generation in low-irradiance conditions — early morning, late afternoon and overcast days — with a 65–500V MPPT tracking range and a max recommended PV array size of 1,400W STC. Maximum conversion efficiency is 97.4% (European efficiency 96.5%). The transformerless design keeps the unit to just 6 kg and 274 × 254 × 138 mm. Natural convection cooling means no fan, no moving parts, no noise. IP65 rated. G98 certified for UK grid connection. Compatible with ShineWi-Fi, Shine LAN and GPRS monitoring dongles (sold separately) for remote monitoring via the Growatt ShinePhone app. Standard 5-year warranty, extendable to 10 years.
1kW
AC Output
97.4%
Max Efficiency
50V
Start Voltage
AFCI
Arc Fault Prot.
6 kg
Weight
IP65
Protection
ℹ Installer Code Policy: Growatt is introducing an Installer Code Policy in the UK and Ireland. Installers must register an Installer Code on the Growatt monitoring platform. This code can be shared with the end user for viewing devices via the installer-level account. See the Growatt Installer Code Policy document (available from Growatt UK) for details.
⚠ Export Limiting Note:MIC TL-X inverters require a Growatt single-phase smart meter to achieve an export-limit (anti-reflux) function. CT clamps are not recommended for this purpose despite being mentioned in older manual versions — Growatt has confirmed CT is no longer promoted for MIC 750–3300TL-X due to known limitations. Use the Growatt single-phase meter for any zero-export or DNO-limited installation.
Key Features
Arc Fault Circuit Interrupter (AFCI) — Detects Series and Parallel Arc Faults
An arc fault is an unintended electrical discharge caused by damaged, degraded or loose wiring in the DC string — one of the leading causes of PV system fires. The integrated AFCI continuously monitors the DC string for the characteristic electrical signature of both series and parallel arcing. On detection, it trips and disconnects the string, stopping the arc before it can ignite insulation or mounting hardware. Unlike a standard DC fuse or MCB, AFCI responds to low-current arcing that would not trip overcurrent protection. On the AF variant, this protection is built in and always active — no separate AFCI device is needed in the DC circuit.
IEC 62109-1Series arc detectionParallel arc detectionAlways active
Integrated DC Isolator Switch — BS 7671 / G98 Compliance, No External Switch Required
BS 7671 (18th Edition) and G98 require an accessible external DC isolator on grid-tied PV inverters, even if the inverter has an internal DC switch. The MIC 1000TL-X (AF) includes the DC switch integrated into the inverter body, satisfying the requirement for a means of isolation on the DC side without the need to purchase and install a separate Projoy PEDS or equivalent unit directly at the inverter. The switch provides a safe means of disconnecting the PV array from the inverter for maintenance and emergency isolation.
DC isolator built-inBS 7671 compliantNo separate isolator needed at inverter
50V Start-Up Voltage — Maximises Generation Hours in the UK Climate
The MIC 1000TL-X (AF) begins converting power from a DC start-up voltage of just 50V. For a typical 380–430W panel with an open-circuit voltage of around 40–48V, this means the inverter starts generating in the first and last usable hour of daylight, in overcast conditions with significant cloud cover, and in partial shading scenarios where string voltage is reduced. The wide MPPT tracking range of 65–500V provides flexibility in string design — particularly useful on small 2–3 panel strings.
50V start-up65–500V MPPT range500V max DC
97.4% Max Efficiency / 96.5% European Efficiency — Transformerless Design
The inverter’s transformerless topology eliminates the copper and iron losses of a traditional galvanic-isolation transformer, achieving 97.4% peak conversion efficiency. The European (weighted) efficiency of 96.5% accounts for performance at different power levels throughout the day, giving a more realistic picture of annual yield than peak efficiency alone. The MPPT tracking efficiency of 99.9% ensures the inverter is continuously extracting the maximum available power from the PV array under all irradiance conditions.
The MIC TL-X series uses natural convection (passive) cooling. There is no cooling fan: the aluminium housing dissipates heat by conduction and free air convection. Eliminating the fan removes the single component most likely to fail in residential inverters, reduces acoustic noise to zero, and removes a maintenance requirement. The inverter operates across a temperature range of −25°C to +60°C and up to 100% relative humidity. It is rated IP65 for installation in exposed locations (garage wall, external soffit, outbuilding).
No fanSilentIP65−25°C to +60°C
OLED Display and Touch Key — Real-Time Monitoring Without a Dongle
The front panel features an OLED display showing live output power, accumulated generation, grid voltage and frequency, and fault codes. A touch-sensitive key scrolls through the display screens. The OLED is readable in bright sunlight, unlike older LCD displays, and draws minimal power. An LED status indicator provides at-a-glance system status: green steady = normal operation; red flash = warning/fault.
OLED displayTouch keyNo dongle needed for local monitoring
G98 Certified — UK Grid Connection Ready, DNO Notification Only
The MIC 1000TL-X (AF) holds G98 (formerly G83/2) certification, the UK Engineering Recommendation for grid-tied microgeneration up to 3.68kW per phase. G98 certification means DNO notification is required (within 28 days of commissioning) but prior approval is not needed for most domestic installations under 3.68kW. This is the standard route for domestic rooftop PV in the UK. Full certification list also includes CE, EN50549, IEC 62116, IEC 61727, VDE 0126-1-1 and others.
G98 certifiedNo prior DNO approvalCE marked
Flexible Monitoring — ShineWi-Fi, Shine LAN, GPRS and RS485
The inverter provides multiple monitoring interface options: an RS485 port is standard for wired local monitoring or integration with third-party data loggers. Optional dongles — ShineWi-Fi (wireless), Shine LAN (wired Ethernet) or GPRS (mobile data) — can be plugged into the signal connector to enable cloud monitoring via the Growatt ShinePhone app (iOS and Android) and the ShineServer web portal. RF monitoring is also an optional interface. All monitoring options are compatible with the -X monitoring range only — older -S or non-X dongles will not work.
RS485 standardShineWi-Fi optionalShinePhone appX-range dongle only
Compact and Lightweight — Single-Installer, Single-Trip Installation
At 6 kg and 274 × 254 × 138 mm, the MIC 1000TL-X (AF) can be lifted and mounted by one person without assistance. The mounting plate bolts to the wall first; the inverter then clips on. DC connections use standard H4/MC4-compatible push-fit connectors (MC4 adapters are optional). The AC output connection is via an IP-rated connector. Low-irradiance start and wide MPPT range means string design is flexible — 2 to 3 standard 350–500W panels in series will comfortably stay within the 65–500V tracking window.
6 kg274×254×138 mmH4/MC4 DC connectors1-person install
What does AFCI do and why does this inverter have it built in?
An Arc Fault Circuit Interrupter (AFCI) monitors the DC string for the electrical signature of arcing faults — rapid, irregular voltage spikes caused by damaged, loose or aged wiring in the PV array. Arc faults can occur at voltages and currents too low to trip a standard fuse or MCB, yet produce enough heat to ignite insulation, roof membranes or mounting hardware. On the MIC 1000TL-X (AF), the AFCI is integrated and always active — no separate DC AFCI device is needed in the array circuit. When an arc is detected, the inverter disconnects the string and displays a fault code. The installer must inspect and repair the DC wiring before clearing the fault and restarting.
Does the built-in DC switch satisfy the BS 7671 / G98 requirement for DC isolation?
Yes. The integrated DC switch on the MIC 1000TL-X (AF) provides the means of isolation on the DC input side required by BS 7671 18th Edition Amd.2 and G98. It allows the DC string to be safely disconnected from the inverter for maintenance and emergency isolation without requiring a separate Projoy PEDS or equivalent external switch installed immediately adjacent to the inverter. Note that where a separate DC isolator is required at the array or roof level (not at the inverter), a separate device is still needed at that location.
How many solar panels can I connect?
The inverter accepts one string of one or more panels in series, within a DC voltage range of 65–500V at the MPPT (500V max open circuit). For typical 400–440W panels with a Vmpp of ~35–37V and Voc of ~44–48V, a string of 2–3 panels will comfortably stay within the MPPT tracking window. The maximum recommended PV power is 1,400W STC (1.4:1 DC-to-AC oversizing ratio, within Growatt’s recommendations). Exceeding 500V DC open circuit at the lowest expected temperature will damage the inverter — always check Voc at −10°C when designing the string.
Do I need a monitoring dongle?
No dongle is required for local monitoring — the OLED display shows live output, accumulated yield, grid voltage, frequency and fault codes directly on the unit. For remote monitoring via the Growatt ShinePhone app or ShineServer web portal, you need a compatible monitoring device: ShineWi-Fi (wireless), Shine LAN (wired Ethernet) or GPRS (mobile data SIM). These plug into the 8-pin signal connector on the inverter. Only -X range monitoring dongles are compatible — older -S or non-X devices will not work with this inverter.
Is prior DNO approval needed to install this inverter?
For most UK domestic installations under 3.68kW single-phase, this inverter’s G98 certification means you can install and commission without prior DNO approval. You must notify the DNO within 28 days of commissioning. Exceptions apply: if the total generation capacity at the site is above 3.68kW per phase (when combining existing and new generation), G99 (prior approval) applies. Always confirm current DNO requirements with your installer before commissioning.
Related Products
Growatt ShineWi-Fi Monitoring Dongle
Wi-Fi cloud monitoring for Growatt -X range inverters
Projoy PEDS DC Isolator
External DC isolator for array-level DC isolation
SolaX Pocket WiFi V3.0 Monitoring Dongle
Cloud monitoring dongle for SolaX inverters
Projoy PEFS-EL Firefighter Safety Switch
Rapid-shutdown DC string safety switch for PV arrays
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs
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