All things Sunsynk (Deye, Inge, etc...)

[B-1]

Yeah I have 9 panels on the one MPPT and 11 on the other all going North.

So I could rebalance them onto one MPPT and then setup the other in parallel East / West just not sure if I would be winning or not.

That would be a lot cheaper If you can reconfigure the north ones to balanced strings that are below the MPPT rating and then add e/w strings.
Have a look at the mc4 blocking diodes they are supposed to offer some protection for differently orientated strings.

 

[AchmatK]

I didn't know that existed thanks. Always just heard about aux or gen.

The aux is very configurable.

1. Generator input, or
2. Micro inverter input for
A. Grid tied inverter with is own solar panels and even batteries, or
B. Micro inverter, or
C. Wind turbine with its own controller and inverter, or
3. Auxiliary load output mainly like a dump load for geysers or other non essential loads when excess solar is avaliable.

With 2 above the main inverter becomes the grid for the micro or grid tied inverter and even if it's bigger the sunsynk will only pull from it up to the maximum it's allowed to. The sunsynk will control what it pulls from the aux and not the size of the inverter attached to the aux port.

 

[SauRoNZA]

That would be a lot cheaper If you can reconfigure the north ones to balanced strings that are below the MPPT rating and then add e/w strings.
Have a look at the mc4 blocking diodes they are supposed to offer some protection for differently orientated strings.

And I assume you mean up to the 425V limit.

Which is for the MPPT as a whole across both strings right?

That limits me to 10 panels at 450W and 5 per string which at least means only moving from 1 array.

But then the cost of that likely amounts to the same as fitting an external MPPT or inverter.

 

[B-1]

And I assume you mean up to the 425V limit.

Which is for the MPPT as a whole across both strings right?

Yes, but I'm more worried about the current as that will double with 2 strings in parallel.

The 8kw mppt is 18a Max if I remember correctly so if you have 10 or 11 amp panels you will waste everything above 18 amps after doubling so 20 or 22 amps(2 or 4 amps wasted) .

 

[Speedster]

Yes, but I'm more worried about the current as that will double with 2 strings in parallel.

The 8kw mppt is 18a Max if I remember correctly so if you have 10 or 11 amp panels you will waste everything above 18 amps after doubling so 20 or 22 amps(2 or 4 amps wasted) .

Isn't the mppt meant to be closer to 20A?

Here's mine from yesterday.

 

[Speedster]

Nameplate says 22A with 28A max ISC.

 

[RonSwanson]

Okay so crimped it and double checked the dip switches were correct and still no BMS communication.
I’m out of ideas.
Could this be firmware related? I see my Deye is version 3381.

You wonderful people! I double check my crimp to one find that the cable was loosely plugged into the CAN port on the inverter. BMS is up and running Thank you @Willie Trombone

@Die Uwe had the same problem. The guys crimp the cable OK but forget to bend the clip backwards, so the virgin plug falls out of the socket. Rookie mistake.

 

[B-1]

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Nameplate says 22A with 28A max ISC.

View attachment 1483247

The sunsynk manual has it at 18a+18a and I've heard of guys complaining about clipping issues between 18 and 20 amp depending on firmware version.

The other issue I forgot about is the Max PV input of 10400w. I believe that is split between the two mppts as well so @SauRoNZA is already using the mppts to their Max.

 

[RonSwanson]

I have 12 450w panels in two strings on my existing 5.5kw inverter. I'm paralleling another inverter. Should I be connecting one string to the new inverter? I do plan on adding more panels in the next 12 months.

I guess that it depends on your ultimate goal/objective, what does that look like? How many panels do you ultimately envisage, their placement, tilt and azimuth? That should inform how you plan your strings.

 

[B-1]

@JohnJuniorV3 I noticed mine also singing yesterday while under load (6.8 with pass-through). Here it is:

Microsoft OneDrive

1drv.ms

I must admit, I'm not a fan of the noise though its fairly quiet... Reminds me of caps boiling lol. I can't say I heard any sound coming from the appliances or PSUs tho... The rest of the house seems quiet... Just my inverter in the garage.

My 8kw noise is also just in the garage and fairly soft. I tried an app and it also just registers. Although I'm no teenager anymore.

 

[Speedster]

My 8kw noise is also just in the garage and fairly soft. I tried an app and it also just registers. Although I'm no teenager anymore.

Mine did it for the first day or so after installation but stopped after that. No idea why though.

 

[SauRoNZA]

.


The sunsynk manual has it at 18a+18a and I've heard of guys complaining about clipping issues between 18 and 20 amp depending on firmware version.

The other issue I forgot about is the Max PV input of 10400w. I believe that is split between the two mppts as well so @SauRoNZA is already using the mppts to their Max.

I only have a 6300W in play.

But explaining the 18a+18a like I’m an idiot could be useful.

Canadian Solar 450W panels.

 

[Speedster]

I only have a 6300W in play.

But explaining the 18a+18a like I’m an idiot could be useful.

Canadian Solar 450W panels.

Each MPPT can receive 18A (or 22A) at the panel voltage. So if your panel string is running at say 350V, each MPPT can handle 350V x 18A = 6300W.

Going by my experience, you should be able to get at least 20A though.

 

[Speedster]

Check while it's under load perhaps... Or pulling heavy from the panels.

I've had it for 8 months now. I'm sure I would've heard something.

 

[B-1]

I only have a 6300W in play.

But explaining the 18a+18a like I’m an idiot could be useful.

Canadian Solar 450W panels.

When you wire panels in series you add the voltage together when you wire them in parallel the current increases. If you wire them in series parallel to the same mppt you need to take both into account. I'm going to round the numbers below for ease.

If you combine your 450w panels into 2 strings of 10 panels each you have to multiply the panel voltage of 41v x 10 to give you 410v total whether thats one string of 10 or 2 in parallel it stays 410v.
By adding the 2 strings of 10 panels in parallel however you need to take the panel Max current of 11 amps and multiply that by 2 as there are 2 strings of 11 amp in parallel so 22 amps.

MPPT controllers have certain limitations voltage and current(amps) being some of them. If you exceed the voltage the mppt will be damaged so you never want to do that. Current on the other hand is controlled by the mppt so it will only draw the Max its firmware dictates(to a point) and the rest will be wasted. So if your panels can deliver 22 amp but the mppt only draws 18 amp you will see the watts generated on a graph having a flat top and not a bell curve as the extra power was not utilised.

 

[SauRoNZA]

When you wire panels in series you add the voltage together when you wire them in parallel the current increases. If you wire them in series parallel to the same mppt you need to take both into account. I'm going to round the numbers below for ease.

If you combine your 450w panels into 2 strings of 10 panels each you have to multiply the panel voltage of 41v x 10 to give you 410v total whether thats one string of 10 or 2 in parallel it stays 410v.
By adding the 2 strings of 10 panels in parallel however you need to take the panel Max current of 11 amps and multiply that by 2 as there are 2 strings of 11 amp in parallel so 22 amps.

MPPT controllers have certain limitations voltage and current(amps) being some of them. If you exceed the voltage the mppt will be damaged so you never want to do that. Current on the other hand is controlled by the mppt so it will only draw the Max its firmware dictates(to a point) and the rest will be wasted. So if your panels can deliver 22 amp but the mppt only draws 18 amp you will see the watts generated on a graph having a flat top and not a bell curve as the extra power was not utilised.

But wouldn’t those amps only come into play if that parallel was active at the same time, like say East + North?

If I made it East + West the one array will effectively be offline when the other comes online.

 

[Speedster]

But wouldn’t those amps only come into play if that parallel was active at the same time, like say East + North?

If I made it East + West the one array will effectively be offline when the other comes online.

I think you are correct. Either way, you will only "lose" power when the current exceeds the MPPT capacity. Even if you had them both running at full beans you'd only lose an amp or two for an hour or so. The loss will be minimal.

 

[SauRoNZA]

I think you are correct. Either way, you will only "lose" power when the current exceeds the MPPT capacity. Even if you had them both running at full beans you'd only lose an amp or two for an hour or so. The loss will be minimal.

So then my peak capacity would dip down to 4500W, but I’ll be making 2250W at the crack of dawn and another 2250W very late into the afternoon so I reckon it’s a win win.

Basically spend no money other than solar panels and adding another battery.

How much pushing my luck would it be running more than 10? I guess 11 would probably be okay but not make much sense for balance and have a loss there again while 12 would be definite problems.

 

[Speedster]

So then my peak capacity would dip down to 4500W, but I’ll be making 2250W at the crack of dawn and another 2250W very late into the afternoon so I reckon it’s a win win.

Basically spend no money other than solar panels and adding another battery.

How much pushing my luck would it be running more than 10? I guess 11 would probably be okay but not make much sense for balance and have a loss there again while 12 would be definite problems.

At panel VOC of 49.1V and MPPT maxing out at 425V (and burning out at 500V) I wouldn't go over 10.

 

[B-1]

But wouldn’t those amps only come into play if that parallel was active at the same time, like say East + North?

If I made it East + West the one array will effectively be offline when the other comes online.

You can try and install things to best take advantage of the full mppt input.
East and west facing panels will still push a significant amount of power during mid day so there will be plenty of overlap. But that being said there are many ways to install things so you will know best what your usage patterns are.