Hi all,
I have according to the VEcalc - 4.0 an allowed system with 5 x 395 Wp in a row and 6 Parallel. Total of 30 PV Moduls ( Trina TSM-395 DE 9.08 ) - makes 11850 Wp.
I want to oversize as much as possible, as I got the PV Moduls quite cheap and I want to increase PV farming in Wintertime in north Germany.
The VEcalc says "Accepted" .
I set the worst conditions - highest minus temp.... highest possible plus temperature.....
What could happen?
I could turn off one string/line ( 5 (row) x 2 (parallel) = 10 in total) in summertime... if needed.
My setup :
Inverters:
3 x Multiplus II 5000 50-70 ( 3 phase setup) - Grid connected , excess harvest will be feed in, and optional Backup connect with manual switch when blackout occurs.
System max output MUST stay the same. Just want to be more independent in Wintertime.
Batteries 48V :
12 x Pylontech US3000C ( 4 x 3 connected ) : 42KW
MPPT´s:
2 x MPPT 250/100 with currently 16 x Trina TSM-395 DE 9.08 = 6320 Wp
( Intention to go to 30 x PV Modul = 11850 Wp - Max V = 228.1V in worst conditions ) (10 degree EAST-WEST )
- Oversized by 104% approx. ( Max output 250/100 = 5800 W )
1 x MPPT 150/85 with currently ( 2 row x 6 par) 12 x Trina TSM-395 DE 9.08 = 4740 Wp
( Intention to go to 18 x PV Modul ( 3 row x 6 par) = 7110 Wp - Max V = 138.4V in worst conditions )
- Oversized by 45% approx. ( Max output 150/85 = 4900 W )
1 x MPPT 150/60 with currently 8 x Trina TSM-395 DE 9.08 = 3160 Wp (10 degree EAST-WEST )
( Intention to go to 12 x PV Modul ( 3 row x 4 par) = 4740 Wp - Max V = 138.4V in worst conditions ) - CHANGE to FACADE direction 90 degree ( housewall - for max Winter
harvest when sun is VERY low - North of Hamburg - Germany)
- Oversized by 38% approx. ( Max output 150/60 = 3440 W )
The VEcalc is giving me all above calc as "ACCEPTED" .
In total :
NOW = 20.54KW/p
INTENTION = 35.55 KW/p
I do know that Oversizing that much would be a waste in summer, but I do want to get max possible output in Wintertinme, where we do have between 21KW/h per KWp per month and 27KW/h per KW/p per month - Nov, Dec and Jan. I could improve harvest :
1. in the above months extremely, because in these mth. the harvest will NEVER go on max.
2. the neighburing month where we do not have full on sun ( Sep, Oct, Feb, Mar), where the harvest will go VERY RARELY on max.
3. in the mornings and in the evenings in the main harvest mths. ( where the max is regularly reached - Apr. to Aug .
Obviously I do not want to damage my MPPT`s ......
Is my thinking correct?
Do I miss anything?
