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Hi All, after much research, discussion and help from this forum I have completed my wiring diagram for my home installation. I believe it meets South African safety standards and the SunsynK hybrid inverter. Your comments are welcome. I will post the parts list as soon as I have completed it. After installation I will add a report. Thank for your help.

Inverter wiring for SunSynk as per regulations.jpg

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  • 1 month later...

@TonyH did you go with this diagram?

Think I read that a sub db needs to be powered from the main db via a 2p isolator. 

Is QF5 1p? 

It was suggested to me to place the CT straight after utility supply before non-essential (normal) loads. It will still prevent feeding the Grid but will give you an overall picture of usuage. 

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  • 3 weeks later...

I have decided to split Neutrals for possible future additions. Started the Phase 1 of my Project on Saturday 27 Feb. Discovered that the 10mm crimp ferrule on the Hubble is a 6mm. The ferrules sent were 10mm. I am ready to implement the wiring for my phase 1. (Inverter and battery as well as split DB Neutrals). The DC and AC trunking are well separated. Dc will be in the left trunking and AC on the Right hand side. I am being careful to make sure that the air from the cooling fans are OK. I have left place to put in future cooling fans on the LHS if needed. The earth to spike trunking for the Neutral anti-floating is separate so that I can easily run the earth to the spike. The layout of the house DB has been separated into Critical and non-critical. Waiting for a sparky to connect the DB to the by-pass switch next to the DB. I can't isolate the incoming wire so that is not a DIY for me. I still need to drill and chisel two holes for cabling between the garage and inside the roof for cabling to DB in the house.

Inverter wiring SunSynk 8kW split Neutral.jpg

AC DB and Neutral earthing box.jpg

DB Layout.jpg

Fuse holder to battery missing 8mm lugs.jpg

Preparing for wiring Phase 1.jpg

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2 hours ago, TonyH said:

The earth to spike trunking for the Neutral anti-floating is separate so that I can easily run the earth to the spike.

Looking good, Is the earth spike also bonded to main grid earth or kept separate and used only for SPD’s and when R1 switches on?

Could you explain what QF6 is used for as I can’t see it’s function or where it is?

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The earth spike is not bonded to Plant earth as the inverter is an alternative generator when on island mode. I will add the regulation diagram sent to me. Q6 is the Earth leakage switch from the inverter to the critical load. Function of Q6- Q6 is actually an isolation switch and an earth leakage switch as an earth leakage can't be regarded as an isolator. The earth leakage protects the critical load (most of my home loads). There must be an isolation switch between the inverter and the critical load. The earth from the inverter load must be bonded to the plant earth in the home DB. The earth spike will be the ground for the load neutral when the inverter is on island mode. R1 will energise and ground the load neutral by means of the ATS output from the inverter.

IMG-20210219-WA0001.jpg

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26 minutes ago, TonyH said:

The earth spike is not bonded to Plant earth as the inverter is an alternative generator when on island mode. I will add the regulation diagram sent to me. Q6 is the Earth leakage switch from the inverter to the critical load. Function of Q6- Q6 is actually an isolation switch and an earth leakage switch as an earth leakage can't be regarded as an isolator. The earth leakage protects the critical load (most of my home loads). There must be an isolation switch between the inverter and the critical load. The earth from the inverter load must be bonded to the plant earth in the home DB. The earth spike will be the ground for the load neutral when the inverter is on island mode. R1 will energise and ground the load neutral by means of the ATS output from the inverter.

IMG-20210219-WA0001.jpg

Does this implies there must be two earth leakage devices:  1 for normal and one for esential?

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1 hour ago, TonyH said:

The earth spike is not bonded to Plant earth as the inverter is an alternative generator when on island mode.

Tony thanks for the explanation I am not sure if there is any regulation that states if the earth spike need to be bonded to utility earth or not. I think it is the installers choice and there might be benefits or disadvantages by bonding them together. I have bonded my earth spike’s to the utility earth, and my SPD’s are also on that same  common earth. It’s a bit of a grey area where there is not very clear information on the best practice.

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I have two earth leakage devices. 1 for the non-critical loops which is on the feed from the grid. This protects the non-critical loops. The other earth leakage is on the output or load of the inverter towards the critical loops.

 

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  • 2 weeks later...
On 2021/03/03 at 8:20 PM, TonyH said:

I have two earth leakage devices. 1 for the non-critical loops which is on the feed from the grid. This protects the non-critical loops. The other earth leakage is on the output or load of the inverter towards the critical loops.

 

I have discovered via the Forum that I must not have an earth leakage between the Grid and Grid in on the inverter. I was tripping on earth leakage every time the anti islanding relay deenergised when the grid came back on. There should only be a overload before the Inverter Grid in. All working ok now. I am struggling to get the Solarmann App working.

 

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On 2021/03/03 at 6:16 AM, TonyH said:

The layout of the house DB has been separated into Critical and non-critical.

Just out of interest I have done almost the same splitting my DB into three parts critical and non-critical but than the third split for Eskom only loads (dishwasher and geyser) this in my case required three earth leakages, one per section. This allow me when Eskom is load shedding the combination to have either critical or non-critical on or off solar depending on the needs at the time.

 

11 hours ago, TonyH said:

I have discovered via the Forum that I must not have an earth leakage between the Grid and Grid in on the inverter.

I had the same issue where my Eskom earth leakage would trip when switching back to the grid due to the neutral earth bonding on the inverter. What I have done to overcome this was to create a clean dedicated circuit before the Eskom earth leakage to feed the inverter. I kept this circuit to a red dedicated socket outlet where the inverter is just plugged in when charging batteries is required especially during cloudy conditions. The bulk of the time the battery are charged with solar and the power to the inverter is normally kept off. To make things easier I installed a sonoff switch on the dedicated plug so I can switch charging on or off from my phone, charging can also be set with the sonoff timer settings. 

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2 minutes ago, Gerrie said:

I had the same issue where my Eskom earth leakage would trip when switching back to the grid due to the neutral earth bonding on the inverter.

On top of this I occasionally also had the critical earth leakage trip due to the transient currents when switching all back to Eskom. All these teething problems were sorted and the system has been running trouble free for two years now.

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  • 2 weeks later...

Hi All, I had to move my critical earth leakage switch from before the Solar/Grid selector switch to after the selector switch. Putting the Earth leakage on the Inverter load (UPS) before the selector would mean no earth leakage when selected to Grid Feed. The PV's are coming on Tuesday after Easter. COC straight after that. I am keen to see the system working with the PVs. As it is now Eskom load sharing doesn't bother us any more.

Inverter wiring split Neutral and Earth Bar As Build.jpg

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  • 4 weeks later...

Report after two weeks with PV panels. I am very impressed with the easy to use programming. The system is working well and charging my Hubble AM2 before 12 midday.

The 5.5kW battery discharges to between 37% and 41% in the morning.  On the odd evenings where we have used the oven for a couple of hours we use the grid from about 5am as the battery is at my minimum of 35%.  We have ordered another Hubble AM2 as this will make us totally self sufficient no matter what ESKOM does. 

Commissioning problems were solved quickly. The software had to be downloaded by wifi to allow the Inverter to use the battery during the night. This was done remotely and was solved within 24hrs. I was impresses with the Sunsynk backup.

Synsynk 8kW Inverter (8kW chosen so that house users don't worry about overloading the critical load.)

10 390W JA panels. 5 East and 5 West.

1 Hubble AM2 5.5kW battery.

IMG_20210412_111217.jpg

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  • 5 months later...
On 2021/03/03 at 6:16 AM, TonyH said:

I have decided to split Neutrals for possible future additions. Started the Phase 1 of my Project on Saturday 27 Feb. Discovered that the 10mm crimp ferrule on the Hubble is a 6mm. The ferrules sent were 10mm. I am ready to implement the wiring for my phase 1. (Inverter and battery as well as split DB Neutrals). The DC and AC trunking are well separated. Dc will be in the left trunking and AC on the Right hand side. I am being careful to make sure that the air from the cooling fans are OK. I have left place to put in future cooling fans on the LHS if needed. The earth to spike trunking for the Neutral anti-floating is separate so that I can easily run the earth to the spike. The layout of the house DB has been separated into Critical and non-critical. Waiting for a sparky to connect the DB to the by-pass switch next to the DB. I can't isolate the incoming wire so that is not a DIY for me. I still need to drill and chisel two holes for cabling between the garage and inside the roof for cabling to DB in the house.

Inverter wiring SunSynk 8kW split Neutral.jpg

AC DB and Neutral earthing box.jpg

DB Layout.jpg

Fuse holder to battery missing 8mm lugs.jpg

Preparing for wiring Phase 1.jpg

Looking good, where did you get the Earth / Neutral Bond Box ?

And if I may ask how does it look like on the inside, I assume it's a simply relay with a breaker / switchover?

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Hi All

Pardon my very basic/trivial question.

TonyH what drawing tool do you use to produce your diagrams? I was wondering if a template for PowerPoint existed or LibreOffice Draw for these drawings

Help will be appreciated

Neville

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On 2021/10/25 at 2:39 PM, RabidBunny said:

Looking good, where did you get the Earth / Neutral Bond Box ?

And if I may ask how does it look like on the inside, I assume it's a simply relay with a breaker / switchover?

I purchased a relay box from power forum shop. 

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On 2021/01/08 at 9:04 PM, TonyH said:

 

Inverter wiring for SunSynk as per regulations.jpg

@TonyH I have no technical input on this thread, other to note that it is a fresh breeze on this hot summer's day to see someone drawing a wiring diagram of components and interconnections  like you've done here, sir. Leaving Nothin to the imagination. Just like nature intended.  Why the electrical industry has no legacy of residential  installation  drawings , boggles the mind.cheers.

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  • 2 weeks later...
On 2021/03/31 at 3:53 PM, TonyH said:

Hi All, I had to move my critical earth leakage switch from before the Solar/Grid selector switch to after the selector switch. Putting the Earth leakage on the Inverter load (UPS) before the selector would mean no earth leakage when selected to Grid Feed. The PV's are coming on Tuesday after Easter. COC straight after that. I am keen to see the system working with the PVs. As it is now Eskom load sharing doesn't bother us any more.

Inverter wiring split Neutral and Earth Bar As Build.jpg

Hi Tony I’m also impressed with your drawing. Question now that you invented the wheel. QF1 & QF6 (power to and from inverter) you have 63A overload. The pass thru on 8KW unit is 90A. Do you think one could upsize to say a 80A overload and still be within the Sunsynk limits. (Wiring of course would be 25mm2 but not sure if 25mm2 would fit into Sunsynk terminals) 

Input will be appreciated.

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