Can you limit the PV power that enters on to the inverter?

[Creatura_n]

I got 3x 5KW Easun Igrid SV II in parallel mode.
Each inverter has 12x 375W solar panel in series (total solar panels 36) the problem is that i got 50 solar panels.
If i try to put more solar panels i get error 72 when the sun comes out from a cloudy day.
From the beginning of spring one inverter worked very well with 10 solar panels in series and 2 serios of 10 in parallel (total 20 solar panel on one inverter) but now in the summer i keep getting ERROR 72.
Seems that the inverters are not getting error 72 if i got a bigger load wile its sunny.
I assume that the problem is when its sunny and i dont have any load and the inverter send the current to the batteries (3x 300A Lifepo4 in paralel and 16 of this pack in seris) and then i get the error 72.

Is there any way that i can limit the 20 Solar panel so they wont produce more then 5KW?

 

[Crowz]

You can parallel them for over paneling but you cant run to many in series. Just divide them up so you stay under your max voltage.

(12 in series) and (12 in series) then paralleled together. This puts 24 panels on one inverter safely if it can handle 12 panels in the first place voltage wise.

Its listed as 12s2p.

Another way is 6s3p. So 6 in series done 3 times via parallel for 18 panels.

You just have to figure out how to get the most out of 50 panels with 3 charge controllers whiles staying over the minimum it requires and under its max too.

Fun fun

 

[rodrick]

The easiest way to limit to 5k approximately is remove 6 panels

 

[Creatura_n]

hmmm, Seems is stuck again at error 72...
thats how i got them connected now:
Inverter 1: 10S in parallel with 12S
Inverter 2: 4S in parallel with 4S
Inverter 3: 10S

The problem is if i use only one inverter (not in parallel so i get only 5KW) i dont have any error (so the other 2 inverters are just mppt)
If i turn them on to get in parallel if its cloudy outside and suddenly the sun comes out from clouds i get error 72

 

[Crowz]

What is error 72?

 

[Creatura_n]

Error 72 the Parallel user manual says Current sharing fault

 

[timselectric]

10S in parallel with 12S

This is a waste of 2 panels.
It's only going to function like 10s2p.

 

[Creatura_n]

even if i try 10S 2p on each inverter i might still get error 72?

 

[Quattrohead]

Are you going over the VOC of the PV input on the inverter's ? Just double check as I don't see this addressed.
After that is it because you have different amounts of panels on the inverters and they can't share properly and just double check your current sharing cables make sure they are good.

 

[Creatura_n]

they are good, cuz i allready changed them, i also tought that the cables might be the problem.
im not going over VOC i got VOC of 450V

(Voc): 41.1 V for each solar panel

 

[Creatura_n]

the solar panels are longi 375w

 

[HRTKD]

they are good, cuz i allready changed them, i also tought that the cables might be the problem.
im not going over VOC i got VOC of 450V

(Voc): 41.1 V for each solar panel

12 of those panels in series is 493.2 volts, well over the Maximum PV Input Voltage of 450 volts.

 

[Creatura_n]

Actually there are: i just checked
Inverter 1: 10S in parallel with 10S
Inverter 2: 4S in parallel with 4S
Inverter 3: 10S

 

[HRTKD]

Inverter 1: 10S in parallel with 12S

From post #4, which you're saying was incorrect?

 

[Creatura_n]

From post #4, which you're saying was incorrect?

Yeah, actually i dont have any 12S.. its 10sp2

 

[Creatura_n]

I have spoke with easun producer via aliexpres and they told me this regarding error 72

" If this is the case, it needs to be solved by adding capacitance at the PV side of each inverter, please download the SOP for adding capacitance here:

https://we.tl/t-6X5KNULZb3

The specification of the capacitor is 3.3UF, 630VDC "

Do you think this is posible?

 

[HRTKD]

Creatura_n, always provide links to the specifications/datasheet for the products in question. Provide correct links if these aren't right.

Link to the solar panels:

LONGi - LONGi Hi-MO 4m

LONGi offers professional consulting services, technical knowledge of PV power plant and charging station solutions, and full life-cycle O&M capabilities.

www.longi.com

Link to the all-in-one:

48v 230vac Grid Tied + Off Grid 80A 5000w Hybrid Solar Inverter w/ Built-in MPPT Solar Charge Controller

Main Features Pure sine wave max 5000w output Max 80A MPPT solar charger (max 5kw PV array) Max 450Vdc input HYBRID Grid-Tie / Off Grid SOLAR inverter for 48V system Parallel support up to 9 units Batteryless operation Total system max charging: 80A Bundled monitoring & setting software Supports...

www.easunenergy.com

The only conclusion I can reach is that you pushed the limits by adding panels. Back off the number of panels. I've never heard of adding a capacitor on the PV side. Maybe it will work, maybe it won't.

Since you mentioned clouds, it's possible that you're experiencing cloud-edge effect which can briefly increase the voltage. If your system is already close to the Max PV Input Voltage, when the clouds are there you could be exceeding that voltage. Too many panels in series. Change to three parallel strings with fewer panels in series like @Crowz suggested.

Edge-of-Cloud Effect, may not be what you think it is.

Could be a problem if you are close to the limits of your controller.

solarhomenews.wordpress.com

 

[Creatura_n]

If i change 3 parallels strings i will exceed the max amp

 

[Tomthumb62]

If i change 3 parallels strings i will exceed the max amp

Usually this isn’ta problem like going over VOC. Usually if you go over in amps, your charge controller will simply clip the extra amperage. The downside is this leads to wasted watts during peak sun hours. The upside is your production will be at max amps for more hours of the day. Which is good for charging but may lead to reducing the lifespan of your AIO due to excessive heat since it’s charging all out much more of the time. This is called over paneling and most charge controllers can handle it but check the owners manual first.

 

[timselectric]

If i change 3 parallels strings i will exceed the max amp

Voltage is pushed.
Amperage must be drawn.