The Sigen Sensor TP-CT100-WI is a three-phase, wireless-enabled power sensor built specifically for the SigenMicro ecosystem. Fitted at the grid connection point, it measures live import and export across all three phases continuously, feeding this data directly into the SigenMicro WLAN Mesh network so the system can provide zero-export energy metering without a separate external gateway.
Unlike the RS485-only Sigen Power Sensor variants used with the SigenStor battery ecosystem, the -WI suffix denotes wireless communication: this sensor can talk directly to SigenMicro inverters over the same WLAN Mesh network already used between the microinverters themselves, or fall back to a wired RS485 connection where the installation uses Sigenergy inverters that communicate over RS485 instead.
A built-in current transformer (CT) clamps around each incoming supply phase, so there is no need to break or route the live conductors through the sensor body. The unit mounts on a standard 35mm DIN rail in the consumer unit, with onboard status LEDs for power, wireless connection, and RS485 activity, and supports both 3-wire and 4-wire three-phase supply configurations.
Class 1
Metering Accuracy (±1%)
WLAN + RS485
Communication
3W / 4W
Supported Grid Wiring
Please Note
This is a SigenMicro-specific sensor, distinct from the Sigen Power Sensor range used with SigenStor battery systems. The -WI models communicate wirelessly over the SigenMicro WLAN Mesh network as their primary method, with RS485 available as an alternative wiring scenario for other Sigenergy inverters — always confirm which sensor variant your installation calls for before ordering.
Zero Export Energy Metering
Continuously measures grid import and export across all three phases at the connection point, giving the SigenMicro system live data for zero-export compliance and generation monitoring.
Wireless WLAN Mesh Communication
Talks directly to SigenMicro microinverters over the same WLAN Mesh network used between the inverters, removing the need for a dedicated communication gateway.
Built-In Current Transformer
Uses an internal CT rated to 100A per phase, so the sensor clamps onto the existing supply cables rather than requiring the live conductors to be cut or routed through the unit.
Supports 3-Wire and 4-Wire Systems
Compatible with both 3-phase 3-wire and 3-phase 4-wire grid configurations, covering the range of three-phase supply arrangements found in UK installations.
Class 1 Metering Accuracy
Delivers ±1% metering accuracy, suitable for accurate export tracking and Smart Export Guarantee (SEG) reporting.
RS485 Fallback Connection
Also supports a wired RS485 connection for installations using Sigenergy inverters that communicate over RS485 rather than WLAN Mesh.
Product Identity
Model
Sigen Sensor TP-CT100-WI
System Compatibility
SigenMicro (WLAN Mesh) or RS485-based Sigenergy inverters
Power Supply & Grid Connection
Grid Connection Type
Three-phase, 3-wire / 4-wire
Nominal Voltage
3 x 220/230/240 Vac, 50 / 60 Hz
Voltage Measurement Range
100 - 277 Vac (L-N), 173 - 480 Vac (L-L)
Current Measurement Range
0 - 100 A
Measurement Accuracy
Electricity Metering Accuracy
Class 1 (error within ±1%)
Communication
Wireless
WLAN Mesh (SigenMicro network)
Wired Interface
RS485 (alternative wiring scenario)
Status Indicators
Power, wireless connection, RS485 activity LEDs
General Data
Ingress Protection Rating
IP20
Installation Method
DIN Rail 35 mm
Important Safety Information
Installation and connection to the incoming electrical supply must be carried out by a qualified electrical installer, in accordance with current UK wiring regulations. Always avoid hot-line work — isolate the supply before connecting or servicing the sensor.
What does the Sigen Sensor TP-CT100-WI do?
It measures live grid import and export across all three phases at the connection point and feeds this data to the SigenMicro system, enabling zero-export energy metering and accurate generation monitoring.
How does this sensor communicate with SigenMicro inverters?
Primarily over WLAN Mesh — the same wireless network used between SigenMicro microinverters — meaning no separate communication gateway is needed. It can also connect over RS485 for installations using Sigenergy inverters that use that interface instead.
Does this sensor work with both 3-wire and 4-wire three-phase supplies?
Yes, the TP-CT100-WI supports both 3-phase 3-wire and 3-phase 4-wire grid systems.
Is this the same sensor used with SigenStor battery systems?
No. This is a SigenMicro-specific -WI variant built for wireless mesh communication with microinverters. SigenStor battery systems typically use the separate RS485-only Sigen Power Sensor range (TP-DH / TP-CT-DH and equivalents).
Do I need to cut the live cables to fit this sensor?
No. The TP-CT100-WI uses built-in current transformers rated to 100A per phase that clamp around the existing supply cables, so the live conductors do not need to be disconnected or routed through the sensor body.
