top of page

EASTRON METERS - Do you need one?

Updated: May 5, 2023

Hi everyone!

Does the distance between your grid mains incomer and inverter exceed 10 meters, resulting in inaccurate power readings? Don't worry! We have a solution for you: installing an EASTRON meter extends the connection distance and ensures precise readings.

These EASTRON meters can be provided by your wholesaler. It is essential that the model number is SDM120CT, as this should come with a CT clamp featuring a 120A/40mA ratio. Using any other EASTRON meter may result in potential inaccuracies.

Contact your wholesaler directly to get the right meter and enjoy accurate power monitoring for your solar power system!

[Information extracted from the images above]


Single Phase Energy Meter

Model: SDM120CT-M

Input: 230V ~ 50/60Hz

40mA CT

[Symbol] 1: Configurable

[Symbol] 2: 1000imp/kWh

IEC62053-21 CI:1

-25ºC ~ +55ºC IP51 CAT II



600V, CAT IIII, 50-60Hz

Accuracy: 0.5%

S1 White S2 Black

Rated Input: 120A

Rated Output: 40mA


Here's the installation document which may help to better explain the Eastron meter!

Eastron 1 phase meter with Sunsynk inverter
Download PDF • 335KB

8,649 views51 comments


Hello Georgia,

Is there a 3phase equivalent of this meter. We are really struggling with our large 3phase installs especially when we have a 300A+ supply. Current install has a mains supply of 0.4MVA and the CT mentioned here will suffice. We have also been trying to get the Chint DTSU666 meter working but also without success.

Any help would be greatly appreciated.

Apr 09
Replying to

Get your hands on the SDM630RTM V2.


Hi All, I was going to order a SunSynk hybrid for an installation this week - but this CT Distance limitation is causing me headaches. I'm replacing a Sofar inverter, where the existing CT is wired via Cat5 directly into that inverter ... reading below i understand the limitation, but here in the UK i'm finding it difficult to find these exact Eastron components.

Last comment was some time ago - so before i explore further, i just wanted to see if this is still the recommended solution - and if there is an alternative meter/clamp combination thats been validated.

In my case, i think the CT is in the region of 35m or from the Inverter.


Gary Soar
Gary Soar
Feb 14
Replying to

Hi Kevshed,

Did you manage to find a solution for this as I am in the same boat and cannot find a Eastron with the correct specs?


Yep, it’s the meter port, tech help desk got back to me


Can I have confirmation what port this plugs into on the inverter please. Initially I thought it was the RJ485 port (not that my inverter has one as I found out today - I've got the 2-in-1 that is used to connect to the batteries).

However, should the Eastron be plugged into the meter port? (port is not detailed in the instructions).


Steve Ball
Steve Ball
Aug 21, 2023
Replying to

Did you ever find out whether or not this solution would work? I have a friend who's house feed location is miles from the potential inverter location.

bottom of page