Hi all, sorry for my bad drawing skills, but I hope you get the idea.

My question is simply, is my wiring diagram correct?

- I have not shown the SPDs or the earth neutral bond or the grounding wiring.

- I have nothin on the aux port.

- I don't have a split DB

- I have two 5kw Sunsynk inverters in parallel

 

Do I use a 2 Pole change over switch? and if so, do I bridge the incoming grid to the changeover and the main grid incoming breaker as shown?

Do you see any other issues that I need to take note of?

Thanks for the comments

 

 

 

Edit: 🙂 Drawing attached, shows you what happens when you are in a hurry lol

Edited May 28, 20233 yr by gimme_power

@gimme_power Upload your drawing as i can't see the drawing

1 hour ago, TaliaB said:

@gimme_power Upload your drawing as i can't see the drawing

Thanks for that 🙂

 

Grid in MCB must be moved up, iow change-over sw must feed from the bottom of 63A MCB together with the two 40A.

Remove Load out 63A MCB completely.

Hi @VirWat thanks for the reply. 

1) I like the suggestion about moving the main grid MCB but then, as I understand it, if I switch over to grid side (on switch over MCB), and I want to remove grid from the two inverters I need to isolate them individually (one by one).  If you say the breaker 'must' be moved, is this a regulation or guideline somewhere?

2) The reason I have those parallel breakers (main grid in and main load out) is because of a video of Keith of Sunsynk about paralleling inverters. He said that Grid, Load and Battery should always be switched together.  Not sure I misunderstood what he said.

 

1) Why I said move your 63A up, your change-over switch must feed from the bottom of a protection device (CB)

2) What Keith says in the video, to my understanding, your two single phase, paralleled inverters must feed from one (1) protection device, not two (2).

 So you must only have ONE suitably sized circuit-breaker for Grid In and the same for Load out.

I will try to upload a schematic the way I understand it.

Edited May 30, 20233 yr by VirWat
Add pic

Thanks

1) It makes sense in that case.

2) I agree, that is what he said in the video. So that is why I have those main rid in and load out breakers.  However, to have the option to switch out one inverter completely in case of failure of the one, I thought it would be a good idea. And also, it shows this graphic in the user manual.

Not really clear from sunsynk.

 

Yes, really confusing between what the Boss says and what the manual shows!

Hence I thought I'd go with both 40A breakers to each inverter and 63A breaker as the 'main'

 

But understanding you correctly then I need to put an additional breaker on the grid side before the changeover switch

...and again here at 4.20 to 4.47

 

Exactly so would you then say my diagram is correct except for needing another MCB on Grid side feeding the changeover switch?  It seems like an awful amount of breakers.  Is there a way to achieve the same with less gear?

So using your advice I have now placed my order for AC switch gear and 😓.....  I have JUST enough space in the 2*12 DB I already mounted.  The layout will be something like

 

On 2023/05/31 at 9:15 PM, gimme_power said:

So using your advice I have now placed my order for AC switch gear and 😓.....  I have JUST enough space in the 2*12 DB I already mounted.  The layout will be something like

 

I'm in the same situation and wondering: How are you wiring the E/N Bond relay for 2 inverters? Which relay did you use?

23 minutes ago, p_i said:

I'm in the same situation and wondering: How are you wiring the E/N Bond relay for 2 inverters? Which relay did you use?

Without confirming it 1 relay can work as the output of the 2 Inverters are in parallel. But.... Having a relay on each inverter means no bonding changes when you need to remove 1 inverter. 

This is just how I think🤔

I saw an amp rating spec the first time the other day for 5kw sunsynk vs the 3kw one. I think mine is only 16A so is suitable for the 3kw only. Will need to upgrade. My system is not commissioned yet so will have to report back when all done