Description
xEastron SDM120CTM 40mA Modbus Single Phase DIN Rail Energy Meter
The Eastron SDM120CTM is a single phase multifunction DIN rail energy meter supplied complete with a 40mA CT current transformer. It measures a wide range of electrical parameters and communicates via RS485 Modbus RTU, making it compatible with most major solar inverter brands for export control and self-consumption monitoring. This is the 40mA CT variant; a 100mA version is also available separately.
Key Features
- Single phase DIN rail meter with 40mA CT included
- Measures kWh, kVArh, kW, kVAr, kVA, PF, Hz, V, A and more
- Bi-directional measurement: import and export
- RS485 Modbus RTU communication
- Two configurable pulse outputs
- White backlit LCD display
- Better than Class 1 accuracy
- Compact DIN 43880 format, 35mm rail mounting
- IP51 ingress protection (indoor use)
Product Overview
This meter is designed for residential, utility, and industrial single phase applications. Its bi-directional energy measurement capability makes it well suited to solar PV monitoring, allowing the inverter or energy management system to track both consumption from the grid and any surplus export.
The RS485 port supports Modbus RTU at baud rates of 1200 to 9600 bps, with configurable parity, stop bits, and Modbus address (1 to 247). Pulse output 1 is user-configurable for total, import, or export kWh or kVArh. Pulse output 2 is fixed at total kWh at 1000 imp/kWh.
Inverter Compatibility
The SDM120CTM 40mA is compatible with a wide range of solar inverter brands. Always confirm the correct CT output rating (40mA for this model) required by your inverter before ordering. Using the wrong CT rating will result in incorrect readings.
Applications
- Solar PV export and self-consumption monitoring
- Zero export control with compatible hybrid inverters
- Residential and small commercial energy metering
- DIN rail panel installations
Installation and Safety Notes
This meter operates at mains voltage and must be installed by a qualified electrician in accordance with IET Wiring Regulations. Ensure the CT rating matches the requirements of your inverter before installation. The unit is rated for indoor use only (IP51).
Specifications
x| Inverter Brand | Compatible Model |
| Growatt | SDM630MCT, SDM630MCT-40mA, SDM230Modbus V1, SDM120CTM-40mA |
| Solis | SDM120CT-100mA, SDM630MCT-40mA |
| SolaX | SDM230Modbus V1, SDM630Modbus V2, SDM630MCT |
| Deye | SDM120CT-40mA, SDM630MCT-40mA, SDM630MCT ETL, SDM230Modbus V1, SDM630Modbus V2 |
| Sungrow | SDM72D-M |
| FOXESS | SDM230Modbus V2, SDM630Modbus V3 |
| Hypontech | SDM120CT-40mA, SDM630MCT-40mA, SDM230Modbus V1, SDM630Modbus V2 |
| Kstar | SDM630MCT-40mA |
Return Policy
xWe offer a 14-day, no-quibble returns or replacement policy because we want you to be totally satisfied with your purchase.
If you are unhappy in any way with your purchase, you can return it for a refund or a replacement, as long as you return it in the same condition as it arrived (original/undamaged packaging and product) and within 30 days of receiving it. We will pay for your return postage on a faulty item as long as you send it using Royal Mail 2nd class recorded delivery (for EU or International Shipments, you have to use our UPS account, we will provide you with a return label)
Please keep in mind the following:
- Items returned within 14 days but not in their original and undamaged packaging will also incur a -15% charge per package.
- If you return an item that doesn't adhere to our returns procedure or doesn't include a returns form, you may be liable for a £10 administration fee
- Individual items from a bundle can't be returned, refunded or exchanged. If you want a refund/credit/exchange for a bundle, all items must be returned to us.
Before you return your item, please make sure that:
- You follow our returns process (outlined below)
- The goods and packaging are undamaged
IMPORTANT: We need to be able to identify an item with your order. We can only do this if you follow our returns process. Please do not send us items back that do not follow this process as they cannot be identified properly and will not be replaced or refunded.
What delivery method do I need to use when returning an item?
You must send the goods back to us via Royal Mail 2nd class recorded delivery. Refunds on faulty items returned are reimbursed within 5 working days.
Can I return just one item from multiple purchases?
Yes. Once you start the returns process you will go to a page that will allow you to choose which items you want to be replaced or refunded.
Returning faulty goods
If your item is faulty, you need to follow the returns policy, where you will be able to state that it’s faulty. The product will then arrive at our warehouse for testing.
If your purchase is not within 14 days
You can still exchange your item for a different product or for credit to use on the Voltacon Solar or Ledison-led-lights.co.uk websites (-15% from the credit amount).
Returns outside of the 14-day period do not qualify for the free returns policy.
Returning an item within the warranty
If you have a warranty and want to return a faulty item, you just need to follow our standard returns process. When we receive your item, we will then check that it’s within warranty and for any faults before arranging a replacement.