change/upgrade solar pv system

[Worcester]

Using the power-one optimisers, looking at the datad sheet, you effectively configutre it all as one string, as each optimiser works as it's own mpp tracker.

If you do anything, that may be the most cost effective solution.

 

[Earthstore]

Why not change the 4 panels for Sunpower, or Panasonic, or was it jetson that are 50v?
Then if the inverter allows all the others could be wired on one string.
It may be more cost effective this way, without the potential of having to get back up on the roof every few years if you have any reliability issues.

It may need some careful system design, but then it should have had that in the first place.
Just a thought, that's all.

 

[Vegelen]

Why not change the 4 panels for Sunpower, or Panasonic, or was it jetson that are 50v?
Then if the inverter allows all the others could be wired on one string.

H J Solar are inexpensive, decent panels with a reasonable temperature coefficient:

H J Solar 250W HJM250M-32-BL or HJM250M-32 (Vmp 50.6, Voc 60.5):

http://reseller.segen.co.uk/reseller/docs/HJ Solar HJM250 255 260M - Datasheet Black Modules.pdf

Which solar panels were most affected by shading, was it the south or east or both?