Hi there

I have some confusion that I would like to understand before going ahead with the purchase.

 

So according to the sunsynk spec sheet the mppts of the 12kw is capable of

800vdc ( I'm only looking to use about 450v per mppt)

The strings are :

2 + 1

In my understanding the first mppt which has a double string connection would parallel the array internally 

And the second mppt is just a single string.

 

My question is can I use the first mppt as just a single string to keep my voltage up on that string, instead of using it as a two string with the drop in voltage due to it being paralleled internally...

the reason being I want to keep the voltage of both mppts equal.

 

Would that cause any problems if I don't use the first mppt as a 2 string?

 

I want my array to both run at 450v

So

mppt1 450v

Mppt2 450v

 

Hopefully someone could answer my doubts and questions thanks.

 

 

 

4 hours ago, huzechothia said:

My question is can I use the first mppt as just a single string to keep my voltage up on that string, instead of using it as a two string with the drop in voltage due to it being paralleled internally...

Yes you can (main thing to remember is NOT to go over max voltage)

 

4 hours ago, huzechothia said:

Would that cause any problems if I don't use the first mppt as a 2 string?

No

6 hours ago, SYC said:

Yes you can (main thing to remember is NOT to go over max voltage)

 

No

Thanks my voltage is going to be 450v each mppt I am quite below the max so should be okay.

14 hours ago, SYC said:

Yes you can (main thing to remember is NOT to go over max voltage)

 

No

Another thing I wanted to ask,

 

The first mppt internally parallels the two strings so if my string one is 450v and string 2 is 450v I can connect both strings on the first parallel mppt, 

 

And on the second mppt I can connect another string of 450v that should be okay as well.

 

Is that correct?

On 2023/05/20 at 8:34 PM, huzechothia said:

Is that correct?

👍 but please use max as 400v not 450v coz winter morning panels can go over rate VOC

Edited May 22, 20232 yr by SYC

1 hour ago, SYC said:

max as 400v not 450v coz winter morning panels can go over rate VOC

Max is 800V on this inverter.

3 hours ago, SYC said:

👍 but please use max as 400v not 450v coz winter morning panels can go over rate VOC

The OP clearly mentioned his Voc is 800V. So no problem as indicated. 

Impossible to reach 800V.

Edited May 22, 20232 yr by Scorp007

19 hours ago, P1000 said:

Max is 800V on this inverter.

 

17 hours ago, Scorp007 said:

Impossible to reach 800V.

My bad