13 minutes ago, Degert said:

So after 1 day's proper measurements (not fiddling with the clamp), this is what I got:

Municipal energy used (meter readings): 16.2kWh

Energy purchased according to inverter: 39.3kWh

Energy generated + municipal energy: 34.7kWh

Total consumption energy according to inverter: 56.1kWh

Perhaps someone else could do the same exercise to compare? I am still waiting for Deye to respond about my firmware version.

How is the CT clamp cable (twisted pair) running to the Deye inverter? Are you using the same conduit as the AC? Have you joined the cable?

Some things from @vassen post in this thread:

• Try to minimise the CT clamp cable run from running alongside other AC cables, if possible separate the conduit;
• If you join the wires, try not to exceed 20m;
• Keep the twists in the cable, they are important for reducing EMI.

Perhaps try to run it temporarily on its own and see if it makes a difference?

 

 

3 hours ago, PaulinNorthcliff said:

Shabir +27 (082) 504-4510. Located in Johannesburg is the Deye Technical Support in SA. He came out to my property and updated firmware for me in December.

I believe my firmware is ver 3874, if that sounds correct.

 

Thanks for the details Paul. I've called and sent Shabir a message explaining my issue, and will let you know when I hear back from him. I have version 3854 installed...

2 minutes ago, Degert said:

Thanks for the details Paul. I've called and sent Shabir a message explaining my issue, and will let you know when I hear back from him. I have version 3854 installed...

So Shabir comes out with a whole machine and stuff to update the firmware. It takes about 15 minutes.

 

4 hours ago, YellowTapemeasure said:

How is the CT clamp cable (twisted pair) running to the Deye inverter? Are you using the same conduit as the AC? Have you joined the cable?

@YellowTapemeasure Thanks for the info. They are sharing the same conduit, but the total length is around 4m. The twisted cable from the CT clamp is joined to normal/straight wires in the DB, and it then runs to the inverter box through a conduit.

To test, I will braid my own wire and run it around a wall for about 10m total, as the conduit runs through a wall. I'll do it first thing in the morning, so I'll have a full day worth of data to compare.

5 hours ago, Degert said:

@YellowTapemeasure Thanks for the info. They are sharing the same conduit, but the total length is around 4m. The twisted cable from the CT clamp is joined to normal/straight wires in the DB, and it then runs to the inverter box through a conduit.

To test, I will braid my own wire and run it around a wall for about 10m total, as the conduit runs through a wall. I'll do it first thing in the morning, so I'll have a full day worth of data to compare.

Ok so I couldn't wait, and I put in a new cable for the CT. I twisted the wires myself, but there shouldn't have been any interference, as the wire was run along the ground, far away from AC cables. Inverter says I consumed 11kWh until now. I generated 6.1kWh, so municipal use should be 4.9kWh. However the meter changed by 2.86kWh only.

Has someone else (perhaps with a DEYE/Sunsynk inverter) also tested to see if the data actually adds up?

4 minutes ago, Degert said:

Ok so I couldn't wait, and I put in a new cable for the CT. I twisted the wires myself, but there shouldn't have been any interference, as the wire was run along the ground, far away from AC cables. Inverter says I consumed 11kWh until now. I generated 6.1kWh, so municipal use should be 4.9kWh. However the meter changed by 2.86kWh only.

Has someone else (perhaps with a DEYE/Sunsynk inverter) also tested to see if the data actually adds up?

I will run a test now. 

First need to turn off using the timer and get the batteries to 100%. 

Will report back. 

14 minutes ago, Vassen said:

Hi 

 

ive gone through most of the posts here and your issue does seem a bit strange. 
 

Before I installed my inverter I had an efergy meter for a little while before. My efergy would over read compare to the Eskom bill I would get. When I installed the sunsynk, it differed a lot from the efergy and I was also concerned. After 2 months of comparing the solarman export data to the eskom bill, I found it pretty accurate. Perhaps less than 5% off.  I have a smart meter with no user interface so just rely on my bills. 
 

do you have access to a clamp meter. Maybe you can check how much current you are  using with mainly resistive loads turned on and then work out the kWh over a 10 minute period and see how much the meter moves. 
 

Is there any possibility that the meter is “faulty”. Back in the day, I heard that there were ways to get it to be “faulty” with a little help from some people.

 

I will see if I can do the "resistive test" as soon as I can find a clamp meter, thanks for the idea. I don't think the meter is faulty, as we use about 900-1300kWh per month, which I would think is high enough to not be under-measured.

15 hours ago, Degert said:

Ok so I couldn't wait, and I put in a new cable for the CT. I twisted the wires myself, but there shouldn't have been any interference, as the wire was run along the ground, far away from AC cables. Inverter says I consumed 11kWh until now. I generated 6.1kWh, so municipal use should be 4.9kWh. However the meter changed by 2.86kWh only.

Has someone else (perhaps with a DEYE/Sunsynk inverter) also tested to see if the data actually adds up?

Interesting.

I have taken the data logged in https://pro.solarman.cn (Purchasing kWh) and compared it with my Landis Gyr prepaid meter. The prepaid mater only collects 2 usage stats: last 30 days (since the 30 day reset), and 30 days prior to that.

The prepaid meter reports that for the past 12 days I used 35kWh, and the 30 days prior to that 135kWh.

https://pro.solarman.cn reports that for that last 12 days I used 19.4kWh, and the 30 days prior to that 111.9kWh.

So it seems that my Sunsynk 5.5K inverter stats indicate that I use far less power from CoJ than my meter, an opposite situation to you.

Have you tried to use the https://pro.solarman.cn stats and what are your findings?

 

31 minutes ago, YellowTapemeasure said:

Interesting.

I have taken the data logged in https://pro.solarman.cn (Purchasing kWh) and compared it with my Landis Gyr prepaid meter. The prepaid mater only collects 2 usage stats: last 30 days (since the 30 day reset), and 30 days prior to that.

The prepaid meter reports that for the past 12 days I used 35kWh, and the 30 days prior to that 135kWh.

https://pro.solarman.cn reports that for that last 12 days I used 19.4kWh, and the 30 days prior to that 111.9kWh.

So it seems that my Sunsynk 5.5K inverter stats indicate that I use far less power from CoJ than my meter, an opposite situation to you.

Have you tried to use the https://pro.solarman.cn stats and what are your findings?

 

I have tried using the Pro platform, but you have to set up a separate profile (I couldn't use my Solarman credentials). Then you had to set up a "new" plant, and I got blocked, as the logger "already belongs to another plant". Should I delete my Solarman plant?

7 minutes ago, Degert said:

I have tried using the Pro platform, but you have to set up a separate profile (I couldn't use my Solarman credentials). Then you had to set up a "new" plant, and I got blocked, as the logger "already belongs to another plant". Should I delete my Solarman plant?

I have both and didn't need to delete the profile. 

I think when I initially registered I registered as an installer. Can't recall exactly as it was over 5 months ago now. 

Just checked my meter and stats from the inverter and Solarman Smart app. I have an old spinning meter. Meter reading indicates that from 17:46 until 10:00  this morning I have used 18kWh from the grid. Looking at the inverter and the data from the app my net grid usage is 17.5kWh. This small difference is not a concern for me. 

Edited January 16, 20215 yr by Achmat

15 minutes ago, Degert said:

I have tried using the Pro platform, but you have to set up a separate profile (I couldn't use my Solarman credentials). Then you had to set up a "new" plant, and I got blocked, as the logger "already belongs to another plant". Should I delete my Solarman plant?

I registered as an installer. The same info should be available to you on the normal solarman though, look for data export.

The installer set me up as an owner, so I might just delete my profile and plant and start over. But the data still comes from the inverter, not the platform. @Achmat wow your readings are accurate. @YellowTapemeasure I have been exporting the data, that is how I've done all of my readings. I'll wait to hear back from Deye Technical Support, and I still need to do the resistive test (I also have one of those spinning meters).

@PaulinNorthcliff Shabir called me (at 22:00, colourful guy ) last night, and added me to a DEYE WhatsApp group with some overseas members. They dialled into the inverter and upgraded the firmware to V3.8.7.6 (3876, don't be jealous now). So now I've taken a reading this morning (31.01kWh used at meter, 71.4kWh according to inverter), and it will hopefully be accurate when I take another reading this afternoon. If not, I will have to get the installer involved.

To update, I've borrowed a CT from someone, and after 3 hours of testing, it seems to also be "out" compared to the municipal meter (although the meter only moved 0.39kWh, so I will give it more time). I will do the "resistive test" this weekend to test the meter. Any other suggestions as to what the cause could be would be appreciated.

@DegertHave ever sorted out your issue? I am also struggling with a recent install on my property. I have a Deye 5kw, and the difference between the elec meter and the inverter is not the same. Had two installers out already and cant get it sorted out, firmware was updated.

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Hi Guthrum, I did not. I will check the last few months' worth of readings and post it on here.

On 2021/01/15 at 5:40 PM, Degert said:

Has someone else (perhaps with a DEYE/Sunsynk inverter) also tested to see if the data actually adds up?

I compared my prepaid meter's consumption to that reproetd by my Deye inverter through Solarman, and over a period of a month the inverter data was understated by about 1.5%, which I reckon is accurate enough.    

Edited January 24, 20224 yr by Scubadude

On 1/17/2021 at 9:39 AM, Degert said:

@PaulinNorthcliff Shabir called me (at 22:00, colourful guy ) last night, and added me to a DEYE WhatsApp group with some overseas members. They dialled into the inverter and upgraded the firmware to V3.8.7.6 (3876, don't be jealous now). So now I've taken a reading this morning (31.01kWh used at meter, 71.4kWh according to inverter), and it will hopefully be accurate when I take another reading this afternoon. If not, I will have to get the installer involved.

Please add me your WhatsApp group. İ need technical support