The Sigen Sensor SP-CT100-WI is a single-phase, wireless-enabled power sensor built specifically for the SigenMicro ecosystem. Fitted at the grid connection point, it measures live import and export 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 the incoming supply cable, so there is no need to break or route the live conductor 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.
Class 1
Metering Accuracy (±1%)
WLAN + RS485
Communication
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 at the connection point, giving the SigenMicro system the live data it needs 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, so the sensor clamps onto the existing supply cable rather than requiring the live conductor to be cut or routed through the unit.
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.
Onboard Status Indicators
Front-panel power, wireless, and RS485 LED indicators let installers confirm connection status at a glance during commissioning.
Product Identity
Model
Sigen Sensor SP-CT100-WI
System Compatibility
SigenMicro (WLAN Mesh) or RS485-based Sigenergy inverters
Power Supply & Grid Connection
Grid Connection Type
Single-phase, 2-wire (1P2W)
Nominal Voltage
230 Vac, 50 / 60 Hz
Voltage Measurement Range
100 - 277 Vac (L-N)
Current Measurement Range
0 - 100 A
Self-Power Consumption
2 W
Measurement Accuracy
Electricity Metering Accuracy
Class 1 (error within ±1%)
CT Secondary Current
40 mA
Communication
Wireless
WLAN Mesh (SigenMicro network)
Wired Interface
RS485 (alternative wiring scenario)
Status Indicators
Power, wireless connection, RS485 activity LEDs
General Data
Overvoltage / Pollution Category
CAT III
Ingress Protection Rating
IP20
Operating Temperature Range
-40°C to +70°C
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 SP-CT100-WI do?
It measures live grid import and export 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.
Do I need to cut the live cable to fit this sensor?
No. The SP-CT100-WI uses a built-in current transformer rated to 100A that clamps around the existing supply cable, so the live conductor does not need to be disconnected or routed through the sensor body.
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 (SP-DH / SP-CT-DH and equivalents).
What accuracy class does this sensor provide?
It delivers Class 1 metering accuracy, with error within ±1%, suitable for export compliance and Smart Export Guarantee (SEG) reporting.
