Deye 5kw 3250W per MPPT limit and 9 panels

[OffGridIdaho]

Midnite solar has a string calculator on their website. Maybe they are concerned with hyper-voc on cold mornings?

MidNite Solar - Classic Sizing Tool.

MidNite Solar is the industry leader and manufacture of quality Renewable Energy System electrical components and E-Panels.

www.midnitesolar.com

 

[lichaa]

I bought a 5KW deye to replace my Growatt SPF5000ES with 9 panels 540w in string. I have read the datasheets and manual before buying and there is no mention of the limit of 3250W per MPPT on these documents. Even the seller said 9 x 540W panels in single string would work fine. I didn't want to rewire the array to separate it to 2 strings

I just found out about this limit which is only mentioned on a sticker placed on the side of the inverter

View attachment 105689



Now I will receive the inverter in 2-3 days from China so there is no going back and I have to use it. So I decided to rewire the 9 panels to separate it to 2 strings.
I'm going to break it to 5 panels + 4 panels and I'm worried that the 4 panel string might not be enough for optimum output.


Deye MPPT range is 150-425w

View attachment 105690

My panels are rated at 39V Vmp at NOCT. JA Solar 540w. 'm in Sri lanka so the temp is 26-30c around the year.

View attachment 105691



Do you guys think 4 panels in MPPT would work fine all day optimally? 39v x 4 = 156W which is just 6v above MPPT range


Honestly If I knew this before I wouldn't have bought the Deye because now I have to spend money on rewiring, new SPD's, breakers and PV disconnect switches

Thanks in advance

Hello Ruchira,

I bought the same inverter couple of days ago and I was surprised by this label on it. I have 8 Jinko 545W PV panels already connected in parallel. I got in contact with Deye’s technical support and received the following answer:
“
Dear Lichaa,

This inverter has two MPPTs, and each MPPT has two strings of tracker.

The meaning here is each string of tracker rather than each MPPT.

If only one string of tracker is connected to each MPPT, the max DC input power is 3250*2＝ 6500W.
“
I wanted to share this with you guys
Lichaa

 

[Hbbyd]

Hello guys, I am running 16 *545w panels on my Deye 8K hybrid inverter. I was surprised by the sticker which is also present on the 8K model. I have two strings of 8 panels, one on each mppt. I was able to exceed 3,500w on one string (Had a big load running). I don't think there is a software limit, it is just a caution sticker to extend life of the inverter. Can someone confirm?

 

[RSahan]

Hello guys, I am running 16 *545w panels on my Deye 8K hybrid inverter. I was surprised by the sticker which is also present on the 8K model. I have two strings of 8 panels, one on each mppt. I was able to exceed 3,500w on one string (Had a big load running). I don't think there is a software limit, it is just a caution sticker to extend life of the inverter. Can someone confirm?

What does your sticker say? It should be higher than 3500w right

 

[RSahan]

Hello Ruchira,

I bought the same inverter couple of days ago and I was surprised by this label on it. I have 8 Jinko 545W PV panels already connected in parallel. I got in contact with Deye’s technical support and received the following answer:
“
Dear Lichaa,

This inverter has two MPPTs, and each MPPT has two strings of tracker.

The meaning here is each string of tracker rather than each MPPT.

If only one string of tracker is connected to each MPPT, the max DC input power is 3250*2＝ 6500W.
“
I wanted to share this with you guys
Lichaa

Thanks for sharing but this is confusing. I'm not sure what they mean by 2 strings of trackers on each MPPT. This inverter has a 13A limit on MPPT so its not like you can parallel your 8 panels 4+4 on one input.


If you look at solark 5K (solark=deye) it says 3250w max for each MPPT

 

[lichaa]

Thanks for sharing but this is confusing. I'm not sure what they mean by 2 strings of trackers on each MPPT. This inverter has a 13A limit on MPPT so its not like you can parallel your 8 panels 4+4 on one input.


If you look at solark 5K (solark=deye) it says 3250w max for each MPPT

Hello Again,

In my case I cannot parallel my 8 panels 4+4 as I will be exceeding the 22 amps rating on one input, but I can connect all of them in series on one string as long as I am not exceeding the Voc of 450V.

The deye 8K Inverter supports MAX two strings of panels connected in parallel, so it has two string trackers on each MPTT, in case you need to connect two strings on one MPTT, the max allowed wattage per string is 3250 W, in case you connect your panels in series in one string ( so you will be using one string tracker of this MPTT) the max allowed wattage is 3250W x 2 = 6500 W.

Hope this helps.
I am installing the inverter today and testing. I will share the results.

 

[lichaa]

What does your sticker say? It should be higher than 3500w right

It says 3250W max per MPTT which is not the case, they should have written 3250W on each tracker of the two strings in parallel.

 

[lichaa]

It says 3250W max per MPTT which is not the case, they should have written 3250W on each tracker of the two strings in parallel.

 

[RSahan]

Also check this out https://www.sol-ark.com/wp-content/uploads/2022/08/SA-5K-2P-Spec-Sheet-8-5-22.pdf

 

[RSahan]

Another screenshot showing PV1 operating just fine eventhough its under 150v

 

[lichaa]

View attachment 111654
Another screenshot showing PV1 operating just fine eventhough its under 150v

Hello,

On single MPTT i was getting a power of 4400 W today.

FYI
Lichaa

 

[madmes]

Hello, just signed up to answer this.

I ran into this issue when i asked Deye about the 12kw 3phase inverter which has 2 MPPTs (13A+13A, 13A) up to 700V
Initially they said i need to balance the string to a max of 5200W each (the inverter can take a total of 15600W PV).
But then i reviewed sunsynk videos, and recontacted deye who confirmed that putting more power is acceptable as long as i am within the voltage and current ranges of the MPPTs.

My local deye distributor is also splitting the power evenly across the 2 strings and obtaining good results.
I think better efficiency could be achieved by splitting the panels onto the 3 strings, i might consider that if i find that the inverter running 3 strings is producing more power or is significantly quieter than the inverter with 2 strings that are larger by 50%.

I'm now following the guides and training videos by Sunsynk, they understand this inverter well, and know its limitation.

TLDR: Stay within your PV Voltage(actually 50-100V below the maximum) and Current ranges, and you will be fine.

 

[hima salamo]

I bought a 5KW deye to replace my Growatt SPF5000ES with 9 panels 540w in string. I have read the datasheets and manual before buying and there is no mention of the limit of 3250W per MPPT on these documents. Even the seller said 9 x 540W panels in single string would work fine. I didn't want to rewire the array to separate it to 2 strings

I just found out about this limit which is only mentioned on a sticker placed on the side of the inverter

View attachment 105689



Now I will receive the inverter in 2-3 days from China so there is no going back and I have to use it. So I decided to rewire the 9 panels to separate it to 2 strings.
I'm going to break it to 5 panels + 4 panels and I'm worried that the 4 panel string might not be enough for optimum output.


Deye MPPT range is 150-425w

View attachment 105690

My panels are rated at 39V Vmp at NOCT. JA Solar 540w. 'm in Sri lanka so the temp is 26-30c around the year.

View attachment 105691



Do you guys think 4 panels in MPPT would work fine all day optimally? 39v x 4 = 156W which is just 6v above MPPT range


Honestly If I knew this before I wouldn't have bought the Deye because now I have to spend money on rewiring, new SPD's, breakers and PV disconnect switches

Thanks in ad

I bought a 5KW deye to replace my Growatt SPF5000ES with 9 panels 540w in string. I have read the datasheets and manual before buying and there is no mention of the limit of 3250W per MPPT on these documents. Even the seller said 9 x 540W panels in single string would work fine. I didn't want to rewire the array to separate it to 2 strings

I just found out about this limit which is only mentioned on a sticker placed on the side of the inverter

View attachment 105689



Now I will receive the inverter in 2-3 days from China so there is no going back and I have to use it. So I decided to rewire the 9 panels to separate it to 2 strings.
I'm going to break it to 5 panels + 4 panels and I'm worried that the 4 panel string might not be enough for optimum output.


Deye MPPT range is 150-425w

View attachment 105690

My panels are rated at 39V Vmp at NOCT. JA Solar 540w. 'm in Sri lanka so the temp is 26-30c around the year.

View attachment 105691



Do you guys think 4 panels in MPPT would work fine all day optimally? 39v x 4 = 156W which is just 6v above MPPT range


Honestly If I knew this before I wouldn't have bought the Deye because now I have to spend money on rewiring, new SPD's, breakers and PV disconnect switches

Thanks in advance

From my experience deye is working just fine with 4 jinko 560 w (vmp 41.7) per mppt .

 

[hima salamo]

I'm sure this would help you

 

[Pbrink]

Hello Ruchira,

I bought the same inverter couple of days ago and I was surprised by this label on it. I have 8 Jinko 545W PV panels already connected in parallel. I got in contact with Deye’s technical support and received the following answer:
“
Dear Lichaa,

This inverter has two MPPTs, and each MPPT has two strings of tracker.

The meaning here is each string of tracker rather than each MPPT.

If only one string of tracker is connected to each MPPT, the max DC input power is 3250*2＝ 6500W.
“
I wanted to share this with you guys
Lichaa

Hi Lichaa,
I have the same inverter 6k bought in march '23. The sticker on the inverter says nothing about the limit per MPPT. Just 7800Wp in total. I have 14 panels a 405Wp in series on the south side(PV1) and 6 panels on the west side(PV2). Works well but PV1 is topping off around 3000W. PV1: you can connect two strings here, so is it better to put the 14 panels is parrallel? 2x7 panels? Does PV1 has 2 trackers? But what about the 7800 total input, probably only works if a battery is connected? My battery's has still not arrived so I can't test it now.

 

[LydMekk]

No problem as long as you watch you total voltage PER string - I wouldn't go over 400V. That means 8 panels in series per string normally. So f.ex. 16 panels divided into 2 strings of 8 each - one per MPPT connected.

 

[Sleeper85]

This topic is very interesting. I will soon receive my SUN-6K-SG03LP1-EU.

What I understand for this model is that there are 2x MPPT tracker with max 1 string / tracker so max 2x string. (other Deye models may have 2 string / MPPT tracker but not this model).

From what I understand from the comments left here, coming from Deye, Sunsynk or Sol-Ark.

The 3250W / MPPT tracker limit can be exceeded but it is important to respect the Voc, Imp and Isc limits.

For each MPPT tracker :

• Max 3250W (may be exceeded)
• Max 450V Voc
• Max 13A Imp
• Max 17A Isc

I currently have a string of 8x Jinko 415WC panels, based on the STC values I'm getting :

• 8x 415WC = 3320WC (bigger than 3250W but OK)
• 8x Voc 37.92V = 303V (OK)
• Imp = 13.25A (limit but OK I think)
• Isc = 13.99A (OK)

In addition I have 2 other identical panels left, I think I could even extend this string to 10 panels, right?




Can you confirm that there are no problems connecting this string of 8 panels to the PV1 input?

 

[LydMekk]

All good. Only dealbreaker would be going very close to or over 425V which with 8 under only at 400V so no probs.

 

[cods4]

This topic is very interesting. I will soon receive my SUN-6K-SG03LP1-EU.

What I understand for this model is that there are 2x MPPT tracker with max 1 string / tracker so max 2x string. (other Deye models may have 2 string / MPPT tracker but not this model).

From what I understand from the comments left here, coming from Deye, Sunsynk or Sol-Ark.

The 3250W / MPPT tracker limit can be exceeded but it is important to respect the Voc, Imp and Isc limits.

For each MPPT tracker :

• Max 3250W (may be exceeded)
• Max 450V Voc
• Max 13A Imp
• Max 17A Isc

View attachment 155385

I currently have a string of 8x Jinko 415WC panels, based on the STC values I'm getting :

• 8x 415WC = 3320WC (bigger than 3250W but OK)
• 8x Voc 37.92V = 303V (OK)
• Imp = 13.25A (limit but OK I think)
• Isc = 13.99A (OK)

In addition I have 2 other identical panels left, I think I could even extend this string to 10 panels, right?

View attachment 155383


Can you confirm that there are no problems connecting this string of 8 panels to the PV1 input?

To determine that, we would need to know what the climate is in your location.
If the temperature gets below 20 degrees Celsius during daylight hours (i.e 9am in the morning), then you need to calculate the Voc at that lower temperature (the panel datasheet will tell you what the Voc to temperature relationship is.

 

[Sleeper85]

Here is the calculation with a temperature down to -10°C.

String 8S = 330V
String 10S = 415V

So I think OK either way.