Halcyon

Is your CT reading accurately? Another thing to look at is common neutrals. I had issues in the past where load values were totally wrong depending on what was running. The reason being the inverter's internal CT measuring load is on the neutral wire. If some of the current is flowing down another neutral it will under read and vice versa depending on the situation. If you have a clamp current meter do a test on the load live and neutral to see if they are the same.

With 4 x 450W you should expect about 8,1 Kwh on a good sunny day.

Hi Jaco, yes it is normal that you will have losses due to inefficiencies, however whether Sunsynk machines are actually achieving their advertised efficiency values remains a big question mark for me. I have raised this question with their support and am still waiting for an answer 4 weeks later. Also note that the machine uses 50W to operate. Sunsynk advertise a euro efficiency of 96,5%. Euro efficiency is a weighted average of DC to AC conversion at various loads. My machine is very inefficient at converting solar dc to ac. I have done some tests and calculated my euro efficiency at more like 90%.

Hi All I decided to switch my time of use off from 14:45 to boost charge my battery from the gird in anticipation of stage 4 load shedding. The weird thing is my load power value dipped down to zero 4 times during this period which is impossible as my base load at that time is minimum 600w? Any ideas?

Hi Decsus. The CT coil must be installed at the incoming grid feed of your house pointing towards the inverter before any non-essential loads. https://capture.dropbox.com/RcZJ1yblVUla9uM6

Hi All After a lot of testing, investigation and a repair job, this is what I figured out. - My CT coil is extended and installed +- 30m from inverter using a high quality, shielded, twisted cable to reduce risk of interference. - The Sunsynk CT coil (50ma/100A version) is accurate. I did a test over 4 days to compare the import/export power measured at CT and recorded by Sunsynk logger and my street meter. They are aligned with +- 1% variance. (Street meter actually logs a little less KWH used....yay). - One will measure current on the utility feed using a clamp meter even if CT shows zero on inverter screen. In my case at least 2 amps when zero exporting. Luckily the street meter does not measure this current flow as power used. If I switch off the local grid input at the inverter this current draw immediately dissapears so it is definitely created by the inverter. It is possible something to do with reactive power however Sunsynk have not confirmed the science behind this. https://www.allaboutcircuits.com/textbook/alternating-current/chpt-11/true-reactive-and-apparent-power/ - It is possible that the actual CT coil measurement by the machine can manifest an issue which happened in my case. I noticed that my CT coil measurement started looking out of the ordinary over December 2021. It started under reading by +- 40%. The machine went in for testing and the issue was confirmed. Sunsynk replaced all the boards and I got a new serial number. - One can test if there is interference on your CT coil. Do at night with no solar and time of use switched off. Unclip the CT clamp from the main utility feed. Observe if a value remains on the the screen for CT measurement. If you remove the black and white wires from the contacts and this value dissapears it indicates you may have some interference on your cables causing a fictitious value. Most likely if any interference it will be minimal and wont make a material difference to the workings. - One can adjust the CT coil ratio in case a different CT model is used than the supplied 50ma/100A version. This version needs to be set on 2000:1 - It does seem Sunsynk is rolling out support for their machines to use other types of din rail power meters as opposed to the supplied CT coil, however detail on this is a little scant.

Is the flicker continuous or just at the moment when AC is lost?

Is your BMs errror stop function ticked under battery settings? Apparently if that is on and there is a BMs error the Inverter will shut down and restart. Check that.

Our voltage is pretty stable. Lowest I have seen on the log is about 206V which is well within the range of min and max in settings. Minimum is set at 185V before it should cut off. I have reported to Sunsynk but there is no logical explanation yet. They suggested I monitor the grid frequency and voltage but I am not sure how I can do that over an extended period with another metering device that is not the inverter and can log the frequcny and voltage. When the inverter loses grid one can hear the relay click inside and the Sunsynk app sends a grid disconnect notification to my phone but the non-essentials still run fine in the background or so it seems. Pool pump kept on buzzing away when it happened today again! The machine then reconnects a minute or so later. So I am scratching my head.... Can you access you street side switch at the utility meter to turn the mains off to see if it makes a difference to simulate? I still suggest to try and measure the current on the grid, load (live and neutral wire) and potentially battery cables ins and outs when the power is cut. This will confirm if there is indeed some current flowing which is not being picked up in time to be logged by the machine. Hopefully load shedding back soon for you to be able to test! ha ha. The only way to tell is by viewing the board inside the machine. I do not suggest to open it up Are you using a relay to correct the earth neutral bond when you lose grid? I am not sure if this could cause your issue but it is necessary step to have installed for Sunsynk machines.

I feel your pain with figuring out this one. I am also trying to get the bottom of a new curious situation with my Sunsynk machine where it drops grid connection randomly. Is there no way you can simulate a load shedding event? Theoretically what is the difference between switching off power at your breaker at the DB board and load shedding power off? Perhaps something to do with how the neutral wire is disconnected and some of our more experience PF members may give some insight. If you could simulate the load shedding event you could place a good quality clamp meter with inrush current measurement capability on your load output live wire to see what is happening when power is cut. I would also do the same on the load output neutral wire to check if there is an imbalance. Some of the older machines measurements are on the neutral wire and if there is a common neutral a current rush on that wire may trigger the trip/fault on the machine unknowingly.

The CT coil is fundamental to the correct operation of the machine, especially if you are not allowed to export power. I would suggest you get someone to check your installation. Here is a list of approved installers https://www.sunsynk.org/approved-installers-1

Having perused your pictures here are some initial notes on your settings: Picture 10 - If you don't want to export power beyond your utility meter you should tick zero export on picture 10. Picture 11 - What CT coil was supplied to you? It should be the 50ma / 100A model. The CT ratio should be set to 2000 and not 200, otherwise the reading will be wrong. Picture 4 - Did you installer put in an earth bond relay on the load output? If not they should. You then need to tick the setting "signal island mode" to ensure it operates. Picture 6 - If you dont have a specific use case for Grid peak shaving, untick that setting. Picture 4 - For safety I would make the equalisation days 0, just in case your inverter tries to equalise your lithium which will damage them. This setting only for lead acid. Don't forget to click ok after changing any setting to ensure it saves.

Apologies, this might be a stupid question. Am I correct in saying that with this local setup you can only view the dashboard and log while on your home network?

My 5,5kw Sunsynk has a port labelled BMS485 and also one labelled RS485. My battery is using the BMS485 port. Will output on RS485 work fine for the local setup?

Awesome, looking forward to the next steps. I am a total NOOB at this so have a lot of practice and learning to do ahead of me. I have a question. I assume each time the data is captured from the inverter it is like a snap shot of all the parameters at that moment. (every few seconds?). How exactly are the accumulated figures calculated? The delta between each snap shot value added together?