On a north facing roof with very limited space, just 4 panels can fit.

Does anyone has experience with just 4 panels onto one MPPT?

The 2025 model datasheet says that the mppt startup voltage is 125v.

But, the mppt range states 150 to 425v.

Assuming the Voc is ~50v, the Vmp NOCT at ~38v on some panels will result in voltage just around 150v.

Anyone tried it?

8 hours ago, abd7 said:

On a north facing roof with very limited space, just 4 panels can fit.

Does anyone has experience with just 4 panels onto one MPPT?

The 2025 model datasheet says that the mppt startup voltage is 125v.

But, the mppt range states 150 to 425v.

Assuming the Voc is ~50v, the Vmp NOCT at ~38v on some panels will result in voltage just around 150v.

Anyone tried it?

I have not actually used 4S1P on a Deye or Sunsynk inverters but if you could post your panel spesifications we can calculate exactly what the outcome will be. But according to what you have posted above Voc~50v Vmp Noct ~ 38v you will reach the startup voltage of 125v no problem there. The Voc, Vmp is not affected much by cloudy days only the current. The Voc, Vmp is affected by higher temperatures so at the higher temperatures we can calculate by means of the temp Coefficient in the specs. Should the Vmp drop below 150v the mppt will still produce power but not optimally.

8 hours ago, abd7 said:

Does anyone has experience with just 4 panels onto one MPPT?

I have 4 panels, not ideally located, lots of shade early morning and afternoon, but the voltage of those is around 150V, when unshaded...

see Voltage graph above...

and power produced above... around 9kWh for yesterday.

The power curve above really shows the shading....

7 hours ago, Kalahari Meerkat said:

I have 4 panels, not ideally located, lots of shade early morning and afternoon, but the voltage of those is around 150V, when unshaded...

see Voltage graph above...

and power produced above... around 9kWh for yesterday.

The power curve above really shows the shading....

Yes I had 3 x 50V panels on a Deye 5kW. It did battle a bit to get started but did work during the day. Then changed connection to use 4 x 450W and it works very well. My other string I have 6 x 270W and don't see any reason to upgrade them. They are now 5.5 yrs in use.

9 hours ago, Kalahari Meerkat said:

I have 4 panels, not ideally located, lots of shade early morning and afternoon, but the voltage of those is around 150V, when unshaded...

see Voltage graph above...

and power produced above... around 9kWh for yesterday.

The power curve above really shows the shading....

9 hours ago, Kalahari Meerkat said:

I have 4 panels, not ideally located, lots of shade early morning and afternoon, but the voltage of those is around 150V, when unshaded...

see Voltage graph above...

and power produced above... around 9kWh for yesterday.

The power curve above really shows the shading....

Thanks so much. Is this on a 8kw deye /SunSynk? What's the Voc rating on the panels?

Looks like it should be good to go then.

And to Taliab thanks for your input, I haven't decided on a panel yet, but I will try for a panel with a higher Voc above 52V.

I think it's difficult to get p.v panels with higher voc than 52v , if you decide to have 4 panels ,then it's OK to be in the limits 150v-200v

6 hours ago, Riyad179 said:

I think it's difficult to get p.v panels with higher voc than 52v , if you decide to have 4 panels ,then it's OK to be in the limits 150v-200v

Panels with 585 / 590w rating do, such as the Jinko JKM590N-72HL4-BDV-SF (segen) , has a Voc of 52.6.

Similarly the Trina TSM-NEG18C.20-585 (Heroldts) has a Voc of 52.6v.

20 minutes ago, abd7 said:

Panels with 585 / 590w rating do, such as the Jinko JKM590N-72HL4-BDV-SF (segen) , has a Voc of 52.6.

Similarly the Trina TSM-NEG18C.20-585 (Heroldts) has a Voc of 52.6v.

The JA 600w bifacial has a Voc of 54.75v x 4 = 219v. They are avaliable from Heroldts.

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Buy JA Solar 144 Cell 600w N-Type Bifacial PV Module, 30mm Frame 36/pallet, 792/container online in South Africa. The Herholdts' Group offers a wide range of JA Solar. We offer courier delivery Nation

Having great results from the bi-facial panels in my installations, not scientifically measured, but overall, seems to produce more than normal panels

13 hours ago, abd7 said:

Thanks so much. Is this on a 8kw deye /SunSynk? What's the Voc rating on the panels?

Victron MPPT (250/85), actually, but they would do the same on a the Chinese all in one, I'm pretty certain. The panels are 4 X Jinko 560W, JKM560M-72HL4-V which has Voc of 49.82V+-3%, Vmp of 41.09V and Imp of 13.64A, according to the label at the back of the panels.

Here are my strings at 06h15 this morning PV1=1630W and PV2=1350W. Even with the lower voltage of string 2 they both generated 0.3A and 50W.

Deye 5 kW. PV2 made up of 4 panels.

2 hours ago, Kalahari Meerkat said:

Victron MPPT (250/85), actually, but they would do the same on a the Chinese all in one, I'm pretty certain. The panels are 4 X Jinko 560W, JKM560M-72HL4-V which has Voc of 49.82V+-3%, Vmp of 41.09V and Imp of 13.64A, according to the label at the back of the panels.

The specs on that look a bit different, Mppt startup on your victrons specs say: MPPT operating range: 80-250 V, so it could start up with a lower voltage.

The Goodwe es UNIQ 8kW Hybrid , mppt startup is 58v!

Edited November 6, 2025Nov 6 by abd7

51 minutes ago, abd7 said:

could start up with a lower voltage

On 2025/11/05 at 12:30 AM, abd7 said:

Does anyone has experience with just 4 panels onto one MPPT?

was the question and the Voltage you can see in the graphs provided, they will not differ substantially other than when power is provided/current flows, some MPPT's may prefer lower current and higher Voltage and the graphs would indicate this...

What you want is 72 cell panels (which the Jinkos are) or if available 80 cell panels, higher voltage yet, but I am pretty certain 4 X 72 cell panels in series would allow your setup to generate solar power, probably not enough for your daily consumption, but a fair chunk, I'd imagine, but again, this depends on your daily energy footprint...

20 minutes ago, Kalahari Meerkat said:

was the question and the Voltage you can see in the graphs provided, they will not differ substantially other than when power is provided/current flows, some MPPT's may prefer lower current and higher Voltage and the graphs would indicate this...

What you want is 72 cell panels (which the Jinkos are) or if available 80 cell panels, higher voltage yet, but I am pretty certain 4 X 72 cell panels in series would allow your setup to generate solar power, probably not enough for your daily consumption, but a fair chunk, I'd imagine, but again, this depends on your daily energy footprint...

My call would be look at the specs for the higher voltage but they would normally be half cut cells and 144 in total.

The Canadians with lower voltage are normally with only 120 cells.

Refer to the post by @TaliaB

Edited November 6, 2025Nov 6 by Scorp007

@abd7 and @Scorp007 144 half cut cell panels are usually same Voc and Vmp than the 72 cell panels, but one does get higher Voltage panels, look at this one for instance, I wouldn't necessarily consider those myself, but at "Open-circuit Voltage (Voc/V): 62.4" and "Maximum Power Voltage (Vmp/V): 52.8" they are probably what you want, even though it likely is not necessary to let your Deye do its thing...

53 minutes ago, Kalahari Meerkat said:

@abd7 and @Scorp007 144 half cut cell panels are usually same Voc and Vmp than the 72 cell panels, but one does get higher Voltage panels, look at this one for instance, I wouldn't necessarily consider those myself, but at "Open-circuit Voltage (Voc/V): 62.4" and "Maximum Power Voltage (Vmp/V): 52.8" they are probably what you want, even though it likely is not necessary to let your Deye do its thing...

Thanks for the correction. I thought my 5 Yr old panels were 72 cells but at that time I now think they were 60 cells. Time just fly as we get older and the memory fades.