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Deye 12kw 3-Phase optimal PV Configuration


Jack007

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Hi all, So im ready to acquire 2x Deye 12kw 3-Phase inverters (SUN-12K-SG04LP3-EU), but i need some assistance with the PV array configuration please:

 

Inverter specs:

Max. DC Input Power (W): 15600

Rated PV Input Voltage (V): 550(160~800)

Start-up Voltage (V): 160

MPPT Voltage Range (V): 200-650

Full Load DC Voltage Range (V): 350-650

PV Input Current (A): 26+13

Max. PV ISC (A): 34+17

No.of MPP Trackers: 2

No.of Strings per MPP Tracker: 2+1

 

Im currently lookig at Jinko 555W (JKM555M-72HL4) panels due to cost.

STC Specs:

Voc: 49.72V

Vmp: 40.99V

Isc: 14.12A

Imp: 13.54A

Temperature coefficients of Voc: -0.28%/°C

NOCT: 45±2°C

 

From this i can gather the following (following: https://unboundsolar.com/blog/string-sizing-guide ) :

Min string size: 6 panels (if i take the NOCT Vmp of 38.59V) : 200/38.59 and round up.

Max strings size taking min temp (0°C where i live) into consideration: 14 panels: 800/49.72=16: 16*40.99 = 655.84 - too high so knock one down to 15 panels

temp adjust: 49.72*0.0028 = 0.139216*47 = 6.543152+49.72= 56.27V max Voc at 0°C.

Thus 56.27*15=843.95 - too high so knock one more down to 14 panels.

 

Now for my question and for where im getting confused. 14 panels would mean 7770w - Can one Mppt string handle this amount of power? Would it clip or could it get damaged?

If i aim for 5200w per string - that would mean 9 panels - it would mean my Vmp would only be 368.91 - which in turn would be too low to be optimal due to being to far from 550v. Is that correct?

What would be optimal?

 

Thank you so much

Screenshot 2023-05-09 at 23-01-47 JKM530-550M-72HL4-(V)-F2-EN.ai - JKM535-555M-72HL4-(V)-F3-EN.pdf.png

Screenshot 2023-05-09 at 23-03-09 SUN-5_6_8_10_12K-SG04LP3 5-12kW Three Phase 2 MPPT Hybrid Inverter Low Voltage Battery Inverter Company Supplier Deye Inverter Technology.png

Edited by Jack007
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7 hours ago, Jack007 said:

Hi all, So im ready to acquire 2x Deye 12kw 3-Phase inverters (SUN-12K-SG04LP3-EU), but i need some assistance with the PV array configuration please:

 

Inverter specs:

Max. DC Input Power (W): 15600

Rated PV Input Voltage (V): 550(160~800)

Start-up Voltage (V): 160

MPPT Voltage Range (V): 200-650

Full Load DC Voltage Range (V): 350-650

PV Input Current (A): 26+13

Max. PV ISC (A): 34+17

No.of MPP Trackers: 2

No.of Strings per MPP Tracker: 2+1

 

Im currently lookig at Jinko 555W (JKM555M-72HL4) panels due to cost.

STC Specs:

Voc: 49.72V

Vmp: 40.99V

Isc: 14.12A

Imp: 13.54A

Temperature coefficients of Voc: -0.28%/°C

NOCT: 45±2°C

 

From this i can gather the following (following: https://unboundsolar.com/blog/string-sizing-guide ) :

Min string size: 6 panels (if i take the NOCT Vmp of 38.59V) : 200/38.59 and round up.

Max strings size taking min temp (0°C where i live) into consideration: 14 panels: 800/49.72=16: 16*40.99 = 655.84 - too high so knock one down to 15 panels

temp adjust: 49.72*0.0028 = 0.139216*47 = 6.543152+49.72= 56.27V max Voc at 0°C.

Thus 56.27*15=843.95 - too high so knock one more down to 14 panels.

 

Now for my question and for where im getting confused. 14 panels would mean 7770w - Can one Mppt string handle this amount of power? Would it clip or could it get damaged?

If i aim for 5200w per string - that would mean 9 panels - it would mean my Vmp would only be 368.91 - which in turn would be too low to be optimal due to being to far from 550v. Is that correct?

What would be optimal?

 

Thank you so much

Screenshot 2023-05-09 at 23-01-47 JKM530-550M-72HL4-(V)-F2-EN.ai - JKM535-555M-72HL4-(V)-F3-EN.pdf.png

Screenshot 2023-05-09 at 23-03-09 SUN-5_6_8_10_12K-SG04LP3 5-12kW Three Phase 2 MPPT Hybrid Inverter Low Voltage Battery Inverter Company Supplier Deye Inverter Technology.png

Yes the MPPT can handle 14 panels with ease. MPPT1 can take 34A and MPPT2 17A. You selected a good panel. MPPT1 should be able to handle 2 parallel strings. 

This is how I see it. 

No clipping. You are also well clear of the combined 15.6kW for PV. 

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1 hour ago, Scorp007 said:

Yes the MPPT can handle 14 panels with ease. MPPT1 can take 34A and MPPT2 17A. You selected a good panel. MPPT1 should be able to handle 2 parallel strings. 

This is how I see it. 

No clipping. You are also well clear of the combined 15.6kW for PV. 

Thank you @Scorp007 for your reply.

So you are suggesting 3x strings of 14 panels in series? That would mean 23310W and be 7710w above the 15600W max DC input rating, would it not?

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I'm seeing 9S2P + 9S as a decent enough setup, about as well as you can do with this choice of panel. Better may have been a panel producing max power at a lower current, say 10-11A, so that you could configure for a higher input Voltage closer to middle of the range. But at least with 368V you are still far enough away from the startup and shutdown Voltages. At least you're still in the normal operating range. And with overpanelling with 15.6kW of panels on a 12kW inverter, you should be able to make up somewhat for a less than optimum Voltage. Just my 2c. Your decision, your risk.

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36 minutes ago, GreenFields said:

I'm seeing 9S2P + 9S as a decent enough setup, about as well as you can do with this choice of panel. Better may have been a panel producing max power at a lower current, say 10-11A, so that you could configure for a higher input Voltage closer to middle of the range. But at least with 368V you are still far enough away from the startup and shutdown Voltages. At least you're still in the normal operating range. And with overpanelling with 15.6kW of panels on a 12kW inverter, you should be able to make up somewhat for a less than optimum Voltage. Just my 2c. Your decision, your risk.

Thank you for your reply @GreenFields

Looking at this thread: Deye 12kw 3-Phase inverter MPPT question it seems as though 9S might perform un-optimally?

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21 hours ago, Jack007 said:

What would be optimal?

If aiming to generate maximum PV power (15,600 W) then I would suggest 10s2p on MPPT1 (11,100 Wp) and 10s1p on MPPT2 (5,550 Wp) for a total of 16,650Wp (6.73% oversize) @ 497.2 Voc, 409.90 Vmp and 13.54 Imp.

Edited by Kilowatt Power
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Source one:

Aim for 550V. The VoC needs to be less than 800. VmP = 550V
In terms of current it will draw what it can.
Just don't exceed the relevant Voltages.
Yes, 14 is good.
Math works out.

Source 2:

Good day.

You should be able to have two strings of 14 panels.

I would not recommend 15 or 16 per string as it is too close to the voltage limit and you will loose 900W at peak production.

Kind Regards

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Also just received an answer directly from Deye in China:

Hello!
As you have only provided me with the battery parameters, I have calculated with extreme low temperatures of -25 degrees Celsius. So only 13 can be accessed.
If the minimum temperature is 0 degrees Celsius, then you can access 14. The reason for this difference is that - as the temperature decreases - the voltage of the solar modules increases. To ensure that the equipment is not damaged at the calculated low temperatures, so fewer modules may be connected the lower the temperature.
I believe that he may have also given a recommendation of 5 modules regarding the minimum number of connections. But I think that 6 would give a more optimal working situation for the sake of a more stable operation of the mppt.
Best wishes

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  • 2 weeks later...
On 2023/05/11 at 8:44 AM, Jack007 said:

2x 14 panel string connection instructions from Deye:

1.jpg

This was something I was kinda looking for so on PV 1, you can use a single string you don't have to use 2 strings is that what the factory Said?

I am looking to keep the voltage the same on both mppts, in my understanding is if you connect two strings on pv1 it parallels it internally and for the amount of space I have it will drop my voltage so the only way would be to series panels and connect as one string on pv1 and one string pv2.

 

So I just wanted to confirm that factory did say you can use 1 string only on pv1 its not necessary to use both strings on pv 1 correct?

 

 

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