@RikH,

You were very quick, apologies I misread your post. You'll see mine was edited within the minute.

I am so used to hearing people say that all the strings need to be at the same slope.

Which is not at all what you said.

Edited August 7, 20206 yr by phil.g00

@phil.g00

Thanks for sharing your experience, learnt quite a bit more today

2 hours ago, phil.g00 said:

I think you're missing the point, the point is you can get more panels/MPPT regardless of the size of MPPT.

Oh, I agree with that. My panels are also larger than the MPPTs, and my next set will also be even bigger, but with half looking east and half looking west.

I'm just saying that because of my shady location I took it even further.

13 minutes ago, Louisvdw said:

my next set will also be even bigger, but with half looking east and half looking west.

And you can work on the half East + the half West being 150% of the MPPT rating or to state the converse you could use a smaller MPPT.

2 hours ago, smurfdbn said:

Hi, yes.  The original 6 string are on the roof of our garage oriented NNW.  The plan is to add 3 strings mounted vertically on the side walls of the garage, 2 strings facing East (morning) and 1 string West (afternoon).

I realise that if all the strings were mounted on the roof at same angle etc, this would exceed the rating of my MPPT.

The thinking is that early morning, the East strings would be pushing out close to max while the Roof strings are only starting to "warm up".  As the East strings start to drop off, the main roof strings would pickup where they left off.

Pic taken at 9 am with PV sitting around 1.9 kw

You might consider this arrangement, with the string electrically made up like this. So that the unshaded string works much longer.

It maybe more practical that vertically mounting them with special mounts.

@phil.g00

That is one layout that has crossed my mind - still in planning phase so lots to think about - thanks