Corect value for Paraller/Series modules connection

[Joe1970]

Hello everybody, this is Joe form Italy and actually working in China in the solar biz.
I'm design an Hybrid system for an hotel and I have a question about connection in parallel/series my module string.
My inverter DC solar side is a 6 kWp and it can accept in DC input Max Voc 200 Voc.
I'm using poly module 250Wp (Voc 36,3 and Isc 8,71).
Which one of this connection will be the correct one?
Can you help me?
Thank you to everybody.
String02.jpgString03.jpgIMG_0849.JPG

[Raul]

If this would be me doing it , I would go with 4 panels in 5 strings instead as you to close to the CC limit. All it takes is 5v per panel in a crisp bright day and your voltage will spike over the limit . Also being to close on the high side of the limit , the controler will work harder.
If I'm wrong the profs. will put me right.

[Joe1970]

If this would be me doing it , I would go with 4 panels in 5 strings instead as you to close to the CC limit. All it takes is 5v per panel in a crisp bright day and your voltage will spike over the limit . Also being to close on the high side of the limit , the controler will work harder.
If I'm wrong the profs. will put me right.

Thanks Raul.
The limit is 200V but i would like to keep as much high as possible the voltage and lower the Aperage (181V 8,71A), so I can use normal 4mm cable till to Combiner.
I'm doing new drawing using 5 modules in series X 4 series, than do the parallel connection in a Combiner Box and than go to IV with positive and negative (180V and 34.84 A) 6mm. Short distance, about 30/35 m.
I'm NOT really sure aboout that because I have always work beofre on Grid Tie installation and Modules are almost always in series.
Sorry for my English

[Joe1970]

Should be like that?
String05.jpg

[inetdog]

Should be like that?
[ATTACH]6974[/ATTACH]

'

You have to allow for the increase in Voc when the panel temperature is low.
You can either do the exact calculation knowing the local winter temperature and the temperature coefficient of Voc for the panels you use or you can use the conservative default factor of 1.25 which gives you a winter voltage of 227V for a five panel string.
I would use a four panel string unless you do the actual computation.

[Joe1970]

'

You have to allow for the increase in Voc when the panel temperature is low.
You can either do the exact calculation knowing the local winter temperature and the temperature coefficient of Voc for the panels you use or you can use the conservative default factor of 1.25 which gives you a winter voltage of 227V for a five panel string.
I would use a four panel string unless you do the actual computation.

Yes, it is absolutely correct but it is my fault I didn't say the location ! The plant I'm doing in tropical area, so even in winter time the temperature will never go down + 20 Celsius and summer time no more than + 35 Celsius, so in this case I don have to take care about high voltage factor 1.25 but opposite situation I think.
In this case do you think 5 modules in string series and 4 string in parallel is ok?

[inetdog]

Yes, it is absolutely correct but it is my fault I didn't say the location ! The plant I'm doing in tropical area, so even in winter time the temperature will never go down + 20 Celsius and summer time no more than + 35 Celsius, so in this case I don have to take care about high voltage factor 1.25 but opposite situation I think.
In this case do you think 5 modules in string series and 4 string in parallel is ok?

Yes.